Sulphur High School · Golden Tornadoes · shstornadohealth.com
Explore the world of healthcare — where it came from, how it works, and where it's taking you. Interactive lessons, games, quizzes, and assignment prep for every chapter of the course, with your progress saved as you go.
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Health Science · Chapter 1 · DHO Health Science, 9th Edition
How we went from blaming evil spirits to editing genes — and why every discovery along the way still shows up in the care you'll give real patients.
Case Study Investigation · You can't solve this yet
Mrs. Delacroix is 64. She's managed high blood pressure for years, but lately life has piled up: she works full time and is the main caregiver for her seriously ill brother. In the last two months she's developed new problems.
Her daughter asks you: "Are there any or that could help my mom — and could any of them clash with her medications?"
Gold-underlined words throughout the chapter are key terms. Tap any of them for a plain-English definition — or open the full glossary and drill with flashcards.
Core vocabulary: , , , , , , , , and more.
From a world with no microscopes to a world that edits DNA. Your progress saves automatically — pick up wherever you left off.
Before you learn any history, let's make it personal.
You're 17. You wake up with a high fever, vomiting, severe diarrhea, and confusion.
Today, that's an urgent-care visit, IV fluids, lab tests, and probably a full recovery by the weekend. But it's the year 1500. There are no thermometers, no labs, no germ theory — no one on Earth knows that microorganisms exist.
Make five choices as a sick teenager in 1500. Every path is based on what people actually believed and did. See if you make it — then try a different path.
For thousands of years, illness was blamed on things no one could see or test:
So treatments matched the theory: rituals to drive spirits out, charms for protection, prayers, sacrifices — and herbs and plants, some of which actually worked. Tribal doctors performed ceremonies; many herbal remedies from this era are ancestors of real modern medications.
Ancient people were not stupid. They were doing what scientists do — observing and explaining — without microscopes, lab tests, or imaging. If you can't see bacteria, "an invisible spirit made him sick" is honestly a reasonable guess.
Healthcare advanced every time somebody questioned what everyone "knew" and demanded better evidence. Watch this arc — we'll climb it together:
Egypt wrote it down. China treated the whole person. Greece demanded reasons. Rome cleaned up the city. Every one of those ideas is still on your shift today.
Tap each civilization to open its contribution — and see the "then → now" thread connecting it straight to modern healthcare. Open all four to complete the explorer.
GREECE · ~400s BC
A Greek physician who made a radical claim: disease has natural causes — not angry gods. He carefully observed patients, recorded their signs and symptoms, and looked for patterns. That habit — observe, record, compare — is the seed of everything that follows in this chapter.
He also insisted medicine needed ethics. The Hippocratic tradition — put the patient first, do no harm, protect what patients tell you — still shapes the oaths healthcare professionals take today.
To help the body heal itself, Hippocrates stressed four things: good diet, cleanliness, moderate exercise, and rest. And his era gave medicine its lasting symbol — the Rod of Asclepius, a staff entwined by a single serpent, still on medical logos everywhere.
Egyptians kept the earliest known health records. Sounds boring? Imagine the alternative:
A patient gets medication at 2 PM. Nobody writes it down. The next shift gives it again at 4 PM. For some drugs, that double dose is an emergency.
Science stalled. Sanitation collapsed. And then a disease arrived that changed the world.
After Rome fell, much of its medical and sanitation knowledge faded in Europe. What remained:
Crowded, filthy cities with waste in the streets. Poor nutrition. Constant infectious disease. Treatments built on herbs, superstition, and prayer. Early hospitals existed — often run by religious orders — and monks and priests preserved and copied what medical texts survived, but care was mostly comfort, not cure. The main "treatment" of the Dark Ages was prayer for divine healing, backed by herbal mixtures — while the era's killers circled: smallpox, diphtheria, typhoid fever, dysentery, malaria, tuberculosis, and plague.
Not everywhere went dark, though. Islamic physicians kept medical science moving — Rhazes, a brilliant Arab physician, distinguished smallpox from measles and began using animal-gut suture material to close wounds, a practice that lasted into modern surgery.
Average life expectancy in the Middle Ages was somewhere in the 20s–30s. But that doesn't mean everyone dropped dead at 30.
So many infants and children died that they dragged the average way down. If you survived childhood, you had a real shot at 50 or 60. The tragedy of this era wasn't old age arriving early — it was childhood being lethal.
Each dot is a person in a medieval town. Press play and watch the bubonic plague move through the 1300s — with no germ theory, no antibiotics, and no idea what was happening.
In the 1300s the bubonic plague killed tens of millions of people — in many regions of Europe and Asia, entire towns lost most of their population. It spread fast, there was no effective treatment, and no one understood why, because no one knew existed. Fear tore societies apart: trade stopped, fields went unharvested, families abandoned their sick.
Europe rediscovered curiosity — and invented a machine that spread knowledge faster than any plague.
"Renaissance" literally means rebirth. Interest in science and education came roaring back — and for the first time in centuries, scholars were allowed to dissect human bodies and map what was actually inside.
Artists led the way. Leonardo da Vinci dissected and drew the body in stunning detail — muscles, tendons, the heart. Michelangelo studied anatomy to sculpt and paint it accurately. Art and medicine grew up together: to draw the body truthfully, you had to know it truthfully.
Before ~1450, books were copied by hand — a single book could take months and cost a fortune. Then the printing press arrived:
A doctor in Italy could now learn what a doctor in Germany discovered last year instead of last century. Knowledge stopped dying with its owner.
The printing press's dark side is alive and well on your feed. Judge each health claim below the way a scientist would: what's the evidence? Tap your verdict.
Four breakthroughs turned the body from a mystery into something you could observe, measure, and hear. You'll use their descendants on every patient.
Proved the heart is a pump that pushes blood in a continuous loop — out through arteries, back through veins, over and over. Before Harvey, no one truly understood what blood did.
Built the first mercury thermometer with a reliable scale. Suddenly "he feels warm" became "his temperature is 103.6°F" — a number you can track, compare, and act on.
Ground lenses powerful enough to see a hidden universe: bacteria and other microorganisms, which he called "animalcules." Humanity's first look at the true cause of infectious disease — though it took ~200 more years for medicine to connect the dots.
Invented the stethoscope so physicians could hear the heart and lungs clearly. Listening to the body's own sounds became — and remains — a core assessment skill.
Meet your practice patient. Use each historical tool on them and watch the readout — this is exactly the data trail Harvey, Fahrenheit, and Laënnec made possible. Try all four.
Five people connected the dots between invisible microorganisms and disease — and cut death rates like nothing before or since.
ENGLAND · 1796
Smallpox killed and scarred millions. Jenner noticed milkmaids who caught mild cowpox almost never caught smallpox — so he used cowpox material to protect against smallpox: the world's first . It worked, and it eventually erased smallpox from the planet.
Fighting a disease after it strikes.
Stopping the disease from ever happening. Cheaper, safer, kinder.
CRIMEAN WAR · 1850s
In filthy war hospitals, wounded soldiers were dying of infection more than of their wounds. Nightingale attacked the environment: scrubbed wards, clean linens, fresh air, decent food, organized round-the-clock care — and she tracked the numbers to prove death rates plummeted.
Then she built the first modern school of nursing (1860), turning nursing into an educated, respected profession.
ENGLAND · 1860s
Before Lister: surgeons operated in street clothes, with unwashed hands and instruments, moving patient to patient. Surviving the surgery was step one; surviving the infection afterward was the real gamble.
Lister applied germ theory to the operating room — on wounds, instruments, and hands. Post-surgical infections collapsed. He's why "sterile" is sacred in every OR on Earth.
Drag the gold handle across the ward. Left: a hospital before germ theory. Right: the same ward after Nightingale and Lister. Find the differences — then imagine which bed you'd rather be in.
Spotted the changes? Open windows → controlled ventilation · dirt floors → cleaned floors · shared filth → antiseptic stations · chaos → organized wards.
FRANCE · 1860s–1885
Pasteur proved : microorganisms — not bad air, not curses — cause infectious disease. He invented pasteurization (heating liquids like milk to kill pathogens) and built on Jenner's idea to create new vaccines, including the rabies vaccine (1885).
GERMANY · 1870s–80s
Koch, the "Father of Microbiology," developed culture methods to grow microorganisms in the lab and prove which specific germ causes which specific disease — identifying the bacteria behind anthrax, tuberculosis, and cholera. Know your enemy, and you can fight it.
Humanity spent 5,000 years getting to germ theory — then rewrote medicine in a single century. Here's why it went so fast.
Science, industry, computers, and worldwide communication finally fed each other. One century produced: antibiotics (Fleming's penicillin, 1928), safe anesthesia, blood transfusions, polio vaccines (Jonas Salk, 1952; Albert Sabin's oral version followed), advanced surgery, medical imaging, intensive care units, organ transplants, genetics, and computerized medical devices. Each discovery unlocked three more.
Discovered rays that pass through flesh but not bone — the first way to see inside a living body without cutting it open. Every X-ray, CT scan, and airport scanner descends from this.
Discovered radium (1898), isolated it in pure form in 1910, and pioneered the science of radioactivity — winning two Nobel Prizes and opening the door to radiation therapy, still a frontline cancer treatment today.
Performed the first successful human heart transplant — possible only because surgery, anesthesia, immunology, and critical care had all leveled up together.
Described DNA's double-helix structure — the instruction manual inside every cell. That single insight seeded genetic testing, , and personalized medicine.
The first baby conceived by in-vitro fertilization ("test-tube baby"). Reproductive technology gave millions of families children — and raised brand-new ethical questions medicine is still working through.
A frightening new infectious disease forced medicine to level up fast: blood-supply safety, standard precautions, patient education, and massive research. It also exposed how stigma can hurt patients as much as disease — a lesson healthcare is still learning.
Elizabeth Blackwell (1849) — first female physician in the U.S., forcing open a profession that had shut women out. Clara Barton — founded the American Red Cross (1881) for disaster and humanitarian care. Dorothea Dix — reformed care of patients with mental illness and led the Union's Civil War nurses. Alongside Nightingale, they redefined who healthcare belongs to.
Cumulative review of every historical figure so far. Tap a person, then tap their breakthrough. Clear the board with as few misses as you can.
Matches: 0 · Misses: 0
Tap the events in chronological order — earliest first. Get it right and the years reveal themselves.
History explains how we got here. Now: what problems is healthcare wrestling with right now — and where do you fit in?
Notice something? None of these are "we don't know how to treat disease." Modern healthcare's biggest challenges are about money, people, and access — which is why they're everyone's job, including yours.
American healthcare is astonishing — and astonishingly expensive. means controlling costs while keeping quality high. Big tools include:
Medicare & Medicaid — government programs covering older adults and lower-income patients. — hospitals get paid a set amount based on the patient's diagnosis, so efficient care is rewarded and waste is not. — facilities cut energy and supply waste. Early intervention & prevention — catching problems early costs far less than treating them late. Combining services — facilities share labs, equipment, and services instead of duplicating them.
People are living longer than ever — and living longer means living with more chronic conditions.
That's driving explosive growth in : long-term care facilities, rehabilitation, assisted living, , and . More and more care now happens outside hospitals — in facilities and living rooms.
One law to know: the . It set federal standards for the assistants who deliver much of this care in long-term facilities: an approved training program, a competency evaluation, placement on a state registry, and continuing education to stay current.
You direct a community health system. You have 10 funding blocks — and five places begging for them. Allocate, then press "Run the year" to see what your choices cause. There's no single right answer… but there are definitely wrong ones.
Telemedicine, wellness, whole-person care, biotechnology… and finally, the answer Mrs. Delacroix has been waiting for.
delivers care remotely: video visits, remote monitoring of vitals, specialists consulting across distances. A patient in a small town can see a big-city specialist without a five-hour drive.
is Jenner's prevention idea grown up: exercise, nutrition, sleep, stress management, screenings, and immunizations — staying healthy instead of only treating sickness.
treats the whole person — physical, emotional, social, intellectual, and spiritual needs — not just a diagnosis. (Ancient China called it first; modern medicine came back around.)
Used alongside conventional medicine. Massage to ease pain during cancer treatment. Meditation on top of blood-pressure meds.
Used in place of conventional medicine. Skipping prescribed treatment in favor of herbs alone. Riskier — always something to flag.
Common examples of these therapies: acupuncture, massage, meditation, yoga, tai chi, biofeedback, aromatherapy, and herbal products. Important: "natural" ≠ "harmless" — herbal products can interact with prescription medications, which is why the care team should always know about them. When providers deliberately combine conventional medicine WITH complementary therapies in one coordinated plan, that's — and it must be individualized, because medications, therapies, and patients all interact differently. One patient's perfect plan could harm another.
COVID-19 proved a can still shake the world like the plague once did. So healthcare now trains for the next one: rapid testing and diagnosis, infection control, immunization campaigns, and isolation/quarantine plans. The plague's lesson, finally learned. Health agencies watch several microorganism threats especially closely: novel influenza viruses, coronaviruses, Ebola virus, Zika virus, HIV, and drug-resistant bacteria such as resistant tuberculosis.
turns Watson & Crick's discovery into treatment: genetic testing for inherited disease, gene-based therapies, biotech medications, reproductive technology, and personalized medicine — treatment matched to your DNA.
Four biotech terms to own: — using a person's genetic makeup to choose the drugs and doses most likely to work for them; genetic testing — checking for inherited genes that cause disease; — studying cells capable of becoming any specialized cell in the body; and — research aimed at mapping the proteome, all the proteins our genes produce.
Remember Mrs. Delacroix from the very beginning — high blood pressure, caregiver stress, headaches, stomach trouble, exhaustion? You now know everything you need. Answer her daughter's question.
You'll be around 30 in 2040 — mid-career. Pick the 3 technologies YOU believe will transform care the most, and generate your official prediction card.
THE WHOLE STORY
HEALTH SCIENCE → HEALTHCARE → YOUR FUTURE
You'll complete the Chapter 1 assignment sheet together in class. Run these three drills first and you'll walk in already knowing every name, date, and definition on it.
Every person and term you're expected to match — with the exact contribution and date to remember. Scan it, then drill it below.
Exactly like the matching section in class: tap a person or term, then tap their contribution. Eight pairs per round, drawn from the full roster — reshuffle until every round is clean.
Matches: 0 · Misses: 0
The short-answer section rewards you for explaining, not just recognizing. Try answering each prompt out loud (or on paper) BEFORE you tap to reveal a model answer.
Health Science · Chapter 3 · DHO Health Science, 9th Edition
There are hundreds of ways to work in healthcare — and most of them aren't "doctor" or "nurse." This chapter is a map. By the end, you'll know where you fit on it.
Case Study Investigation · You can't solve this yet
Jaylen is a Sulphur High student who loves biology, is good with computers, and wants a career where he helps people. One problem: he gets lightheaded around blood. His family keeps telling him "healthcare" means doctor or nurse — eight-plus years of school, and blood every day. He's about to give up on the whole idea.
Is Jaylen's family right? Which career pathways fit him — and how many real jobs are waiting there?
Tap any gold-underlined term for a plain-English definition. Chapter 3's terms are all about how the system works:
, , , , , , , and the five pathways.
Your progress saves automatically — pick up wherever you left off.
Every healthcare job on Earth sorts into one of five pathways. Learn the five, and you can find your way anywhere.
Treats patients and changes their health over time — nurses, physicians, therapists, EMS, dental, pharmacy.
Figures out what's wrong — lab, imaging, ECG/EEG, sonography.
Manages the information — records, coding, data, administration, interpreting.
Keeps the facility running safely — equipment, sterile supply, environmental services, food service.
Invents tomorrow's care — engineers, lab researchers, genetic counselors, forensic science.
Healthcare has a door at every level. Tap a rung to see real careers you could start at that education level.
Three words show up on nearly every healthcare credential. Know the difference cold:
— a professional association or government agency issues a statement that you've met the education and performance standards for a career. (Think: CMA, CBET.)
— a government agency authorizes you to work in an occupation after you finish an approved program and pass a state board exam. It's illegal to practice without it. (RN, LPN, MD.)
— a regulatory body gives exams and keeps a current list — a registry — of qualified people. (RD, RT(R), CNA registries.)
And none of it lasts forever: require workers to keep taking approved classes to renew their credential and stay current — because healthcare never stops changing.
Technician vs. technologist. A typically holds a two-year associate degree; a technologist typically holds a four-year bachelor's and takes on more complex, independent work. Same field, different rung.
Assistant / aide. Usually a certificate or on-the-job training — the fastest door in.
are trained in more than one field or skill set. Smaller facilities and rural areas hire them because they can't afford a specialist for every task — one cross-trained worker fills several roles. Around here, that's a real advantage.
— someone who organizes, manages, and takes on the risk of their own business. Healthcare entrepreneurs (private practices, home-health agencies, therapy clinics) tend to be self-motivated, organized, creative, willing to take risks, and persistent.
Every career in this chapter, searchable. Filter by pathway, education, or patient contact. This is your study tool for the whole chapter — come back to it anytime.
Nursing is the largest healthcare profession on Earth — and it's a ladder you can climb one rung at a time while working.
Each rung has its own program and exam. Many nurses work at one level while studying for the next. Remember OBRA from Chapter 1? That's the law setting training and registry standards for nurse assistants in long-term care.
Two different dental doctorates — DDS (Doctor of Dental Surgery) and DMD (Doctor of Dental Medicine) — are the same degree with different names, depending on the school. Dental specialists: orthodontist (alignment of teeth), oral surgeon (surgery on teeth, mouth, jaw), periodontist (gums and the bone supporting teeth), pediatric dentist, endodontist (root canals), prosthodontist (dentures, implants).
The longest road in healthcare — and the fastest one. Both save lives.
MD (Doctor of Medicine) and DO (Doctor of Osteopathy) are both fully licensed physicians. Osteopathic medicine adds extra focus on the musculoskeletal system and whole-person care. Physician assistants and medical assistants work alongside physicians at very different education levels.
Fourteen medical and dental specialties are on your assignment sheet. Read the description, pick the specialist. Runs through all fourteen.
When someone calls 911, EMS is healthcare's front door. Three levels, each with more training and more skills.
Therapeutic careers most students never think about — and several that don't involve human blood at all.
Two of the most confused careers in healthcare: a psychiatrist is a physician (MD/DO) who can prescribe medication; a psychologist holds a doctorate in psychology and treats through therapy and testing.
Same pathway, different patients. A veterinarian's road (bachelor's + four-year vet school) is as long as a physician's.
Rehabilitation, pharmacy, vision, surgery support — the biggest and most varied group in the whole chapter.
The pathway that answers "what's wrong?" — before anyone can treat anything.
Every treatment decision starts with a result someone produced.
Lab values, X-rays, ultrasounds, heart tracings, brain-wave recordings. Diagnostic professionals rarely make the headlines, but physicians can't move without them. Notice how many of these careers start at the associate level.
Nobody applauds these pathways. Remove them and the hospital stops in an hour.
Remember the Egyptians' health records from Chapter 1? This is that idea, industrialized. Two careers to keep straight: a health information technician organizes and codes patient records and gathers statistical data; a medical coder specializes in identifying the diagnoses, procedures, and services in a record and assigning the specific codes that drive billing and DRGs.
Sterile instruments, working ventilators, disinfected rooms, safe meals, a building that runs. Lister and Nightingale would tell you these jobs are infection control.
A Sulphur teenager is in a car wreck on I-10. Follow him through the system — at each stage, pick the professional who actually does that job. Great one for the board.
The newest pathway, the future it's building, and the question this chapter has been leading to: where do you fit?
Chapter 1 ended with Watson & Crick and personalized medicine. These are the people turning that into products, tests, and cures.
Gene-editing therapies for inherited disease. 3D-printed tissue and custom implants. AI reading scans alongside radiologists. Robot-assisted surgery. Wearables that catch a heart problem before you feel it. Every one of these creates careers that didn't exist when your teacher was in high school — and the same thing will happen again before you're 30.
Eight honest questions about what you like and how you want to work. Your answers score all five pathways and hand you real careers to look at. There's no wrong result.
Back to Jaylen — loves science, tech-savvy, wants to help, not great with blood, wants to start working within a few years. His family says "doctor or nurse." You know better now.
HOSA is the national student organization for health science — competitive events in clinical skills and knowledge, leadership training, scholarships, and a direct line to the profession. It's the health science version of a varsity team.
Sulphur High is working to bring a HOSA chapter to campus. When it launches, this class is where its first members will come from. Stay tuned.
THE WHOLE MAP
HEALTH SCIENCE → HEALTHCARE → YOUR FUTURE
You'll complete the Chapter 3 assignment sheet together in class. Four drills cover every section of it.
Twenty-four abbreviations are on the matching section. Eight per round, timed. Tap the career, then its abbreviation — beat your own time.
Matches: 0 · Misses: 0 · ⏱ 0.0s
All fourteen specialties from the assignment sheet, in random order.
Seventeen career descriptions from the assignment sheet. Read the duty, name the career.
Degrees, credentials, CEUs, technicians vs. technologists, multiskilled workers, entrepreneurs, and professional organizations. Answer out loud before you reveal.
Chapter 7 · Anatomy & Physiology · Section 7:1
Trillions of cells. Four kinds of tissue. A dozen systems working at once. Section 7:1 starts at a single atom and zooms out until you're looking at a whole person — the body you'll be caring for.
One you'll crack by the end of this section. The other stays open across Chapter 7 — and you'll collect clues for it starting today.
🗂 Case file #1 · stays open through Chapter 7
Ray runs a busy boudin-and-cracklin food truck. Lately he's up three or four times a night to use the bathroom, he's thirsty all day no matter how much he drinks, and his reading glasses don't seem strong enough anymore. His exam is normal except his weight. The lab sends back three results outside normal limits:
| TEST | RAY | NORMAL |
|---|---|---|
| Fasting blood glucose | 138 mg/dL | < 100 mg/dL |
| Random blood glucose | 221 mg/dL | < 140 mg/dL |
| Hemoglobin A1c | 7.4% | < 5.7% |
You won't name his condition today — the body system responsible comes later in Chapter 7. But 7:1 hands you the first clues. They unlock as you finish lessons:
🩹 Case file #2 · solved in Lesson 5
Eli, 17, ran a three-hour cross-country practice in August heat and barely drank. Now he's dizzy, his mouth is dry, his skin feels papery, and his urine is dark.
Mrs. Odessa Guidry, 78, says her shoes don't fit anymore. Her ankles are puffy, her socks leave deep grooves, and pressing a thumb into her shin leaves a dent that slowly fills back in.
7:1 has more key terms than any section so far — about forty. Every word opens a plain-English definition with its pronunciation. Learn them here and every body-system section after this gets easier.
Start with the big three: , , and .
Watch the depth gauge on the right side of your screen — it tracks how deep you are.
Before you can understand what goes wrong in a body, you need the words for what goes right. Three sciences, four kinds of disease, and the vocabulary every chart uses.
🏗 Structure
The study of the form and structure of an organism. What is it, and where is it? The heart has four chambers.
⚙️ Function
The study of the processes of living organisms — why and how they work. What does it do? The heart pumps about 70 times a minute.
⚠️ Malfunction
The study of how disease occurs and how the body responds to it. What goes wrong? A blocked artery starves heart muscle.
Every disease has a category. Tap a patient case, then tap the type it belongs to. Twelve cases, four types — clear the board.
— identifying the disease: what is it?
— the cause of the disease. Sometimes it's known (a virus causes influenza). When the cause is unknown, the disease is idiopathic. When the cause is a prescribed treatment, it's iatrogenic — like anemia caused by chemotherapy, or low potassium caused by a diuretic ("water pill").
— a prediction of the likely course and outcome: what's going to happen?
Each line comes from a patient's chart. Which term is it?
Every body is built from the same handful of ingredients — and stays alive by keeping them in balance.
Six levels of organization make up a human body. Drag the lens from the smallest level to the biggest and watch each one build the next.
LEVEL 1 OF 6
Atoms are the smallest units of pure elements — hydrogen, oxygen, carbon, nitrogen, calcium. Two or more atoms join to form molecules like water, sugars, and proteins, the building blocks of every body structure.
Molecules can combine through chemical reactions to form compounds — and the body's chemical reactions together are called metabolism. Compounds are classified as organic or inorganic.
Some compounds break apart in water into charged particles called electrolytes. Salt water, for example, holds two: sodium and chloride. The concentration of hydrogen ions is measured as pH — acidic, neutral, or basic.
A constant state of natural balance inside the body. Temperature, water, electrolytes, pH, blood sugar — each has a safe range, and the body works nonstop to stay inside it.
Hot day? You sweat. Thirsty? That's your body asking for water. When balance can't be restored, disease follows.
Things keep happening to your patient. For each event, choose how the body restores balance. Three wrong calls and homeostasis collapses.
The is the basic unit of structure and function in every living thing. Your body has trillions of them — and each one runs like a tiny city.
All life is built from — carbon, oxygen, hydrogen, sulfur, nitrogen, phosphorus. Scientists know the ingredients but still can't combine them to create life. Cells:
Inside the nucleus, condenses into 46 chromosomes (23 pairs). Chromosomes carry , each a unique sequence of DNA. Your is the total mass of genetic instruction you inherited from your parents — strings of roughly three billion DNA nucleotides that tell the body how to build everything from teeth to hormones.
Tap any structure in the cell. Switch between City view (what it's like) and Science view (what it really does). Explore all fourteen.
Tap a structure
Start with the big purple nucleus — it's city hall.
The is semipermeable — it lets some substances in and out while blocking others. Three transport methods move substances across it and help maintain homeostasis:
Diffusion
Molecules move from an area of greater concentration to lower concentration until it evens out. Oxygen diffuses from blood into cells.
Osmosis
Water (a solvent) moves through the membrane toward the side with more dissolved substances, equalizing pressure on both sides.
Filtration
Water and small particles are pushed through by force — blood pressure or gravity. Your kidneys filter waste out while keeping proteins in.
A live simulation of a membrane. Pick a process, press Run, and watch the particles decide where to go.
You lose skin cells every day and never run out. Here's how one cell becomes two — and how two cells become a whole new person.
is asexual reproduction: one cell divides into two identical cells. Drag through the phases or press play.
STEP 1 OF 6
Both start with a cell holding 46 chromosomes. Run each process and watch what comes out.
Within 4–5 days after fertilization, the zygote becomes a hollow ball of cells called a blastocyst. Inside are embryonic stem cells — cells that can become any specialized cell in the body.
Researchers hope stem cells could replace damaged cells and treat diseases like diabetes, Parkinson's, heart disease, osteoporosis, arthritis, and spinal cord injuries. Other sources exist: blood from a newborn's umbilical cord and placenta can be frozen and saved (cost limits its use), and adult stem cells live in bone marrow and the liver — but they can only become more cells of their own kind.
What do you think is the strongest argument on each side? Can you explain the view you disagree with in a way its supporters would accept?
When cells of the same type join together for a common purpose, they form a . There are only four main kinds — and you'll find them in every organ you'll ever study.
🛡 Secrete & protect
Covers the body's surface (the main tissue in skin) and lines the intestinal, respiratory, circulatory, and urinary tracts. In glands, it produces secretions like mucus and digestive juices.
🔗 Support & connect
The supporting fabric of the body. Soft: adipose (fat) and fibrous (ligaments, tendons). Hard: cartilage and bone. Liquid: blood and lymph.
⚡ Control & communicate
Made of special cells called neurons that transmit messages throughout the body. Brain, spinal cord, and nerves are all nerve tissue.
💪 Move & protect
Produces power and movement by contracting. Skeletal moves the bones. Cardiac makes the heart beat. Visceral (smooth) lines the walls of the digestive, respiratory, and urinary tracts and blood vessels.
An unknown slide is on the stage. Turn the focus knob until the image is sharp, then identify the tissue group. Seven slides.
SLIDE 1 OF 7
Bring it into focus first…
Cartilage is tough and elastic. It sits between the bones of the spine and at the ends of long bones, acting as a shock absorber and allowing flexibility. It also shapes the nose, ears, and larynx (voice box).
Bone (osseous tissue) is similar but contains calcium salts, nerves, and blood vessels, making it rigid — it forms the body's framework.
Fat gets a bad reputation, but adipose tissue has three jobs: it stores fat as a food reserve or energy source, insulates the body, and fills spaces between tissue fibers as protective padding.
Tissues are 60–99 percent water. The slightly salty water around cells is called tissue fluid. Drag the slider to change how much is there — then solve the Tale of Two Patients.
Tissue fluid level
Dizzy, dry mouth, papery skin, dark urine after a hot practice.
Puffy ankles, sock grooves, a thumb-press dent that slowly fills.
Tissues team up into organs. Organs team up into systems. Systems team up into the miracle that is a human being.
Two or more tissues joined to perform a specific function form an organ — the heart, stomach, and lungs, for example. Here's the stomach, layer by layer:
Organs and other body parts joined to perform a particular function form a system. All the systems working together create the organism — the whole human being.
The basic systems are integumentary, skeletal, muscular, circulatory, lymphatic, nervous, respiratory, digestive, urinary (excretory), endocrine, and reproductive — plus the special senses. Each one gets its own section later in Chapter 7.
Every organ is loose. Tap an organ, then tap the system it belongs to. Fill every system to assemble a complete human organism.
Organs & structures
THE WHOLE DIVE
NEXT · 7:2 BODY PLANES, DIRECTIONS & CAVITIES
The 7:1 assignment sheet asks you to label, recall, and explain — not just pick an answer. These four drills train exactly that.
Eleven lettered pins. Tap a pin, then tap the structure's name. Each correct label reveals its function — the second half of question 1.
Type your answer — spelling counts on the sheet, so it counts here (we forgive capital letters). Two misses reveals the answer.
Question 6 asks you to sketch mitosis and state what occurs in each step. Tap the phases in order — each one reveals what happens.
The list questions, from memory. Type an answer and press Enter — the meter fills as you remember them. Stuck? Reveal the rest.
Chapter 7 · Anatomy & Physiology
Fourteen sections. Twelve body systems. One extraordinary machine you'll spend your career taking care of. Pick a section, or pick up right where you left off.
Hover or tap a section to light up its system
Live sections glow. The rest unlock as the course moves through the body.
🗂 Case File #1 · Open across Chapter 7
Ray's lab results showed his blood sugar out of balance. Every section of Chapter 7 adds a clue. The diagnosis waits for the endocrine section, but you can start building the case now.
🧪 Specimen Log
Tap structures in the Chapter 7 explorers (Cell City, the Cavity Explorer, the Skin Dive) to log them here.
0 / 0 LOGGED
Chapter 7 · Section 7:2 · Body GPS
North, south, east, and west are useless on a human body. Health care runs on a different map, and by the end of this section you'll read it like a surgeon.
📻 Section case · solved in Lesson 4
The ER radio crackles. An ambulance crew is bringing in a patient from a bike crash, and they describe every injury in pure body-direction language. No "kind of near the side of the arm." Exact terms only.
🗂 Case File #1 · Ray Thibodeaux
Ray's case from 7:1 is still open. This section reveals where the mystery organ is hiding.
This section's vocabulary comes in pairs. Learn one and you get its opposite free: / , / , / .
Three quick ones from last section. Pulling old facts back out of your brain is how they stick.
The compass on the right side of your screen lights up each direction pair as you master it.
Every direction word in health care assumes the body is standing one exact way. Learn the pose, then slice it.
Is the heart "east" of the lungs? It depends which way the patient is facing, and lying down, sitting, or rolled over. Compass words keep changing. Health care uses directional terms that describe one body part relative to another, and they never change.
They all assume : facing forward, standing erect, arms at the sides, palms facing forward. Even if your patient is lying in bed face-down, you describe them as if they're standing in this pose.
Imaginary flat sheets drawn through the body to divide it into sections. The planes also give us vocabulary for sides: a condition affects both sides (arthritis in both knees). A condition affects one side.
This patient is standing all wrong for anatomy class. Tap each body part to fix it until the figure is in perfect anatomic position.
Transverse
A horizontal plane: top half and bottom half. Above it is , below it is . Near the head is ; near the tailbone (sacral region) is .
Sagittal / Midsagittal
A vertical plane: left and right. Right down the midline into equal halves, it's the . Close to the midline is ; away from it is .
Frontal (coronal)
A vertical plane: front and back. The front is or ; the back is or .
Pick a plane. Drag the glowing sheet through the body (or use the arrow keys), then let go to slice. Watch where the halves split and which direction words land on each side.
TRANSVERSE PLANE
Drag the sheet up or down, then release.
Twelve words that let you point to any spot on a body without touching it.
These describe the arms and legs compared with the trunk of the body, called the point of reference. Close to it is proximal; far from it is distal.
With the shoulder as the reference, the elbow is proximal and the wrist is distal. Your fingertips are the most distal point on your arm.
These describe structures inside the body. Superficial (external) means near the body surface. Deep (internal) means away from the surface.
Skin is superficial to muscle. Bone is deep to muscle.
Two spots light up. Pick the right word before the timer runs out. Every correct streak makes it faster. Misses are reviewed at the end.
A cross-section of the forearm. Slide to peel from the most superficial layer to the deepest.
Skin
Whole-class mode for the Promethean board. The board calls out body directions in huge type and everyone does it, standing up. Turn on trick mode: if the command doesn't start with "Simon says," anyone who moves is out.
✋ Try it in class
Pair up. One partner stands in anatomic position; the other places sticky notes on body spots called out by the teacher ("the lateral side of the left knee," "the most distal point of the right arm"). Swap after five calls. Most accurate pair wins.
are protected spaces that hold your vital organs. There are two main groups, and one hidden surprise.
One long, continuous cavity along the back of the body, in two sections: the holds the brain, and the holds the spinal cord.
Three small cavities sit in the face: the (eyes), (nose structures), and (mouth: teeth and tongue).
Larger, and split in two by the diaphragm, a dome-shaped muscle you use to breathe.
Above it, the : esophagus, trachea, bronchi, lungs, heart, and large blood vessels. Below it, the (abdominopelvic) cavity, split into an upper abdominal part and a lower part.
Tap any cavity to flood it with light and see what's packed inside. Use the toggles to see the two main groups. Each cavity you open is logged to your Specimen Log.
Tap a cavity
Start with the big one in the chest.
Plot twist: your kidneys and adrenal glands aren't actually inside the abdominal cavity. They sit behind its lining (the peritoneum), in a space called the retroperitoneal space. Remember that for the next game.
Every organ fell out. Tap an organ, then tap the cavity it belongs in. Watch out for the trick cards.
"My stomach hurts" isn't specific enough to help anyone. The abdomen is so big that health care divides it into a grid.
Split the abdomen with one vertical and one horizontal line through the belly button: RUQ (right upper quadrant), LUQ (left upper), RLQ (right lower), and LLQ (left lower).
Nine regions are more precise: three down the center and three on each side.
Center: epigastric (above the stomach), umbilical (around the belly button), hypogastric or pelvic (below the stomach).
Each side: hypochondriac (below the ribs), lumbar (near the large bones of the spinal column), iliac or inguinal (near the groin).
Switch between the 4-quadrant and 9-region grids, and flip between facing the patient and being the patient. Tap any square to learn its name.
Tap a square
Notice which side says "patient's right."
Patients describe where it hurts. Tap the region they mean. You're facing them, so watch the mirror trap.
Your textbook's checkpoint, on screen. Drag the four lines to split the balloon into nine equal regions. Once the grid locks, tap a label then tap its square. You're facing the patient.
✋ Try it in class
The textbook checkpoint: blow up a balloon to stand in for an abdomen. With a marker, draw the two vertical and two horizontal lines, then label all nine regions. Trade balloons with another group and check each other's work, remembering the patient's right is on your left.
The full report is coming in. For each line, tap the spot on the patient where the injury is. You're facing the patient as they come through the door. When every pin is placed, submit the report for a scored replay.
Every question on the 7:2 assignment sheet, in the same order. Run these and the sheet will feel like a rerun.
Just like the sheet: type the letter from Column B next to each description in Column A, then check your answers.
Ten lettered pins on a side view of the body. Tap a pin, then tap the cavity's name.
Type an organ and press Enter. The meter fills as you remember them. Stuck? Reveal the rest.
Type your answers. Spelling counts on the sheet, so it counts here (capital letters don't matter).
Try each one on paper first, then tap to check yourself.
SIMON SAYS ANATOMY
Get ready…
Chapter 7 · Section 7:3 · The Living Shield
Your skin is the largest organ you own: more than 3,000 square inches of armor, air conditioning, sensor network, and vitamin factory, all in one. It's also the first thing you'll see on every patient.
⛺ Section case · solved in Lesson 5
It's week two of Camp Calcasieu and the line at the nurse's station is out the door. Five people need you. By the end of this section you'll name each problem, decide whether it can spread, and choose the right next step.
🗂 Case File #1 · Ray Thibodeaux
Ray's case is still open. Your skin knowledge adds a clue that health care workers are trained to spot.
The is the skin and everything in it. Many of this section's terms are the words dermatologists use every day, like , , and .
Three quick questions from earlier sections. They all come back in this one.
The depth meter on the right tracks how far down you've gone.
On an average adult the skin covers more than 3,000 square inches and makes up about 15 percent of total body weight. Three layers do all the work.
Layer 1 · outermost
Five thin layers with no blood vessels and no nerve cells. The top layer, the stratum corneum, is constantly shed. The bottom layer, the stratum germinativum, makes the new cells that replace it.
Layer 2 · "true skin"
Also called the corium. A framework of elastic connective tissue holding blood vessels, lymph vessels, nerves, involuntary muscle, sweat and oil glands, and hair follicles.
Layer 3 · innermost
Also called the . Elastic and fibrous connective tissue plus adipose (fat) tissue. It connects the skin to the muscles underneath.
Drag the depth control (or press Dive) to drop through the surface, the epidermis, the dermis, and the hypodermis. Tap any structure you pass to learn what it does. Every structure goes into your Specimen Log.
0 / 19 EXPLORED
Depth: surface
Tap the hair sticking out of the skin to begin.
Each hair has a root, which grows in a hollow tube called a follicle, and a shaft. Hair protects the body and covers everything except the palms and the soles. Due to genetics, some people lose hair on the scalp: , or baldness.
Nails protect fingers and toes. They're dead, hardened (keratinized) epidermal cells packed tightly together, formed in the nail bed. A lost nail grows back if the nail bed isn't damaged.
The top of the dermis is covered with papillae, tiny bumps that fit into ridges on the stratum germinativum. They create the lines on your fingertips and soles. No two people have the same pattern, which is why fingerprints and footprints are used for identification.
A print was lifted from the scene. Compare it with four suspects. First match the pattern type (loop, whorl, or arch), then look for the tiny breaks and dots in the ridges that make a print one of a kind.
✋ Try it in class
Rub a pencil on scrap paper until there's a dark patch of graphite. Press a fingertip into it, then press clear tape onto the finger and stick the tape on an index card. Compare prints with your table: who has loops, whorls, or arches? Can anyone find two that match?
Two kinds of glands and seven jobs. Your skin is doing all of them right now.
Sweat glands: coiled tubes that run up through the dermis and open on the surface at pores. Sweat (perspiration) contains water, salts, and some body wastes. Sweat itself is basically odorless; body odor happens when it meets bacteria on the skin. As sweat evaporates, it removes excess water and cools the body.
Oil glands that usually open onto hair follicles. They make sebum, an oil that keeps skin and hair from becoming dry and brittle. Because sebum is slightly acidic, it's also antibacterial and antifungal. When an oil gland gets plugged with dirt and oil, the result is a blackhead or a pimple.
Change the weather and watch your skin fight to keep your core temperature steady. This is homeostasis from 7:1, happening at the skin.
One square centimeter of skin is about the size of your pinky nail. How much is packed into it? Slide to guess, lock it in, and see the real number.
Protection · Sensory perception · Body temperature regulation · Storage · Absorption · Excretion · Production. Blood vessels that (get larger) let heat escape; vessels that (get smaller) hold heat in. Collect all seven below.
Seven face-down cards, one per function. Tap a card, solve its real-life scenario, and it's yours to keep.
0 / 7 COLLECTED
Skin color is inherited. Changes in skin color can be one of the first signs that something inside the body is wrong.
A brownish-black pigment called is made in the epidermis by cells called melanocytes. Everyone has about the same number of melanocytes. Genes decide how much melanin they make, which is why skin ranges from very light to very dark.
Ultraviolet light makes melanocytes produce more melanin, which protects and tans the skin. Freckles are small concentrated areas of melanin. Carotene, a yellowish-red pigment, also adds color.
A person with no color pigment is an . The skin has a pinkish tint, the hair is pale yellow or white, and the eyes also lack pigment, so they look red and are very sensitive to light.
Change how much melanin the melanocytes make and how much UV light hits the skin. Watch the count of melanocytes: it never changes.
Melanin output (set by genes)
UV exposure
Red
A reddish color caused by burns or a congestion of blood in the vessels.
Yellow
A yellow color from bile in the blood, caused by liver or gallbladder disease, or by diseases that destroy red blood cells.
Blue
A bluish color caused by not enough oxygen. Linked to heart, lung, and circulatory diseases.
Chronic poisoning can also cause a gray or brown discoloration.
Six patients, six color changes. Name what you see, then pick the most likely cause.
Skin eruptions can be a sign of disease. There are eight to know, and each one has a shape you can learn to recognize.
: flat spots on the skin, like freckles.
: firm, raised areas, like pimples or some stages of chickenpox.
: blisters, or fluid-filled sacs, like chickenpox.
: pus-filled sacs, like those seen in acne.
: areas of dried pus and blood, commonly called scabs.
: itchy, raised areas with an irregular shape, like hives and insect bites.
: a deep loss of skin surface that may reach the dermis; can bleed and scar.
: a closed sac with a distinct membrane, usually filled with semisolid material.
Build a skin eruption from its features and watch the cross-section change. The builder names whatever you make. Then take the challenge: build the one it asks for.
YOU BUILT
Challenge
—
0 BUILT
Eight patients, eight cross-sections. Name each eruption. Clear the round to unlock the 30-second bonus blitz.
Ten conditions to know, from everyday acne to the most dangerous skin cancer. Knowing them helps you spot problems early and treat people without judgment.
Inflammation of the sebaceous glands, usually starting in adolescence. The cause is unknown, but hormone changes and extra sebum likely play a part. Follicles get blocked by dirt, cosmetics, oil, or bacteria, causing papules, pustules, and blackheads. Treated with thorough washing, avoiding heavy creams and makeup, antimicrobials, antibiotics, retinoids (vitamin A), chemical peels, or light and laser therapy.
A contagious fungal infection, usually of the feet. The skin itches, blisters, and cracks into open sores. Treated with antifungal medicine, and by keeping the area clean and dry.
Inflammation of the skin caused by any irritating substance, often an allergic reaction to detergents, cosmetics, pollen, or foods. Poison ivy, sumac, and oak cause contact dermatitis. Signs include dry skin, erythema, itching, edema, rashes, and scaling. Treatment removes the cause and uses anti-inflammatory ointments, antihistamines, or steroids.
A noncontagious inflammatory dermatitis triggered by an allergen or irritant, such as diet, cosmetics, soaps, medications, or emotional stress. Causes dryness, erythema, edema, itching, and vesicles that crust or ooze. Treated by removing the irritant, corticosteroids, and thick creams to keep skin moist.
A highly contagious skin infection caused by streptococci or staphylococci, mostly in infants and children. Red sores, often around the nose and mouth, break open and form a yellowish-brown crust. Wash with soap and water, keep dry, and treat with antibiotics.
A chronic, noncontagious disease with flare-ups (exacerbations) and calm periods (remissions). The cause is unknown, possibly hereditary; stress, cold weather, pregnancy, heavy drinking, and hormone changes can trigger it. Thick red patches with white or silver scales. No cure, but coal tar or cortisone ointments, vitamin D creams, and UV light therapy help.
Not a worm at all: a highly contagious fungal infection of the skin or scalp. A flat or raised circle with healthy-looking skin in the middle and an itchy, scaly, or crusty ring. Treated with antifungal medicine.
Caused by the human papillomavirus (HPV). Named by location: genital, plantar (foot), palmar (hand). A rough, hard, raised bump. Some disappear on their own; others are removed by freezing (cryotherapy), acid, chemicals, laser, or shave excision.
Basal cell carcinoma
Starts in the basal cells of the epidermis. Grows slowly and usually doesn't spread. Pink to yellow-white, smooth, with a sunken center and a raised, irregular border.
Squamous cell carcinoma
Starts in thin epithelial cells and can spread quickly. Small, firm, red, flat sores that later scale and crust. Sores that don't heal are often this type.
Melanoma
Starts in the melanocytes. The most dangerous type. Brown, black, pink, or multicolored, flat or slightly raised, asymmetric, with irregular or notched edges.
Usual causes: sun exposure, tanning beds, irritating chemicals, and radiation. Treatment starts with removing the lesion (freezing with liquid nitrogen, laser, or surgery), followed by radiation or chemotherapy if it has spread (metastasis).
Every mole here is generated fresh, so no two screenings are alike. Compare "then" and "6 months later," use the ruler (the gold line is 6 mm), mark every warning letter you see, and make the call.
Knowing what spreads protects patients and coworkers. Tap a condition, then tap the right bin.
Five people in line. For each one: name the problem, decide if it can spread, and choose the right next step.
All ten questions on the 7:3 sheet: one diagram, short answers, eight eruptions, and nine diseases.
Fourteen lettered pins on a skin cross-section. Tap a pin, then tap its name.
Questions 3, 4, 5, and 9 have one-word answers. Type them. Spelling counts.
The list questions, from memory. Type one answer and press Enter.
Say the description out loud first. Then tap to flip and check yourself.
Answer on paper first, then tap to check.
See who has finished each assignment, who's partway through, and who hasn't started. It updates live as students work.
✓ 83 lesson finished (read + quiz + activities), with highest quiz score · 45% partway · — not started. Tap a student for their full report.
Summary is the default. Switch to Details for every attempt and question, or open just the lessons you want with ▸ Details. What you see here is what goes in the PDF.
Every PDF exported from the Reports tab is logged here with the exact data it used, so you can download the same report again any time.
Type one student per line as First Last, choose the class period, then preview. Each student gets a username (first initial + last name) and an easy password.
Passwords are only visible on this teacher page. If a student forgets theirs, tap Show and read it to them.
Each chapter ends with an Assignment Sheet Bootcamp — focused practice for the worksheet you'll complete in class. Jump straight to any of them from here, no scrolling required.
Roster review of every person and term on the matching section, a worksheet-style matching drill, and a short-answer drill covering the whole assignment sheet.
The 24-abbreviation sprint, all 14 medical & dental specialties, the 17 career descriptions, and a short-answer drill on education levels, credentials, CEUs, and entrepreneurs.
Label all 11 cell parts, fill in the key definitions, put mitosis in order, race to recall every list question (functions of cells, tissues, fat, muscle, ten body systems), plus model answers for all 14 questions.
The 13-term directional matching drill, label all ten cavities on the side view, list the organs in every cavity, the four quadrants, and the six abdominal-region questions, plus model answers.
Label the skin cross-section A–N, glands and sweat, the seven functions, abnormal colors, all eight skin eruptions, flip cards for the nine diseases, and model answers for all ten questions.
Use the username and password from your teacher. Your lessons, quiz scores, and badges will follow you to any computer.