How the Human Body Works
Discover the mechanical and chemical principles that keep your body alive and moving. Learn how organs coordinate behind the scenes, how muscles generate force, and how your system automatically balances itself.
Like Duolingo, but for How the Human Body Works. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 11 levels across 2 sections, about 22 minutes end to end, roughly 4 days at five minutes a day. It moves through The Constant Balancing Act and Movement, Fuel, and Cleanup. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in How the Human Body Works
- Homeostasis keeps internal conditions within a healthy normal range rather than frozen at an exact number
- Body levels naturally drift slightly above and below a central set point as you eat, sleep, and move
- The body actively corrects these small drifts to stay balanced
- Negative feedback detects when a level drifts away from its target set point
- The response works in the opposite direction of the disturbance to push the level back toward normal
- Once the level returns to baseline, the corrective response dials back down
- The body uses opposing physical actions depending on whether it needs to gain or lose heat
- Sweating and widening surface blood vessels dump excess heat to the environment
- Shivering and narrowing surface blood vessels generate and preserve heat around vital organs
- Positive feedback amplifies and speeds up a change instead of reversing it
- It is used for urgent, one-off events that need to reach a decisive endpoint quickly
- Blood clotting uses positive feedback so the wound seals fast before excessive blood is lost
- The right side pumps deoxygenated blood under gentle pressure so it doesn't rupture thin lung vessels
- The left side pumps oxygen-rich blood under much higher pressure to push it through the entire body
- The two sides beat at the exact same time but serve completely separate circulatory loops
- The brain monitors blood acidity, which rises as carbon dioxide builds up from cell metabolism
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives How the Human Body Works the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
What happens to your body levels as you go about your day eating, sleeping, and moving?
Get it right to open this lesson and 10 more in the app.
How to learn How the Human Body Works, step by step
Go in order. 11 short levels across 2 sections, about 22 minutes in all, five minutes a day.
- 1
The Constant Balancing Act
- How Your Body Balances Itself
- The Heart-Lung Delivery Loop
- 2
Movement, Fuel, and Cleanup
- How Bones and Muscles Create Motion
- Nutrient Extraction and Waste Filtration
2 sections · 4 units · 11 levels. Built to play, not to enroll.
Questions about How the Human Body Works
How do I learn How the Human Body Works?
Go in order: start with The Constant Balancing Act, then Movement, Fuel, and Cleanup. On Tomo that's 11 short levels, about 22 minutes in all, played five minutes a day. Start free and play the first level in under a minute.
Is there a Duolingo-style app for How the Human Body Works?
Yes. Tomo works like Duolingo: short daily lessons, streaks and quick quizzes. How the Human Body Works is one of its free courses, and you can type any other topic to get a course of your own.
Is the How the Human Body Works course free?
Yes. How the Human Body Works is playable on Tomo's free plan, which doesn't expire. No credit card, no waitlist. Download the app and start your first lesson.
How long does it take to learn How the Human Body Works?
11 levels across 2 sections, about 22 minutes of play in total. It's built for five minutes a day, so you finish it a little at a time instead of all at once.
Do I need any background to start How the Human Body Works?
No. It's pitched at a beginner level, so it starts where you are and builds up. If you can tap a phone, you can start.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
How the Human Body Works is taught in the Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start How the Human Body Works today.
Download Tomo, search How the Human Body Works, and play your first lesson in under a minute.