How Body Systems Interlock
Move beyond isolated anatomy to discover how the human body coordinates its major systems under load. Learn how the nervous, cardiovascular, renal, and respiratory networks constantly negotiate trade-offs to keep you functional and stable.
Like Duolingo, but for How Body Systems Interlock. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 12 levels across 2 sections, about 24 minutes end to end, roughly 5 days at five minutes a day. It moves through Emergency Adjustments and Gas Exchange and Fluid Balance and Competing Priorities. It assumes you already know the basics.
Free forever · No credit card · iPhone & Android
Key ideas in How Body Systems Interlock
- Baseline resting heart rate is continuously held down by an active parasympathetic vagal brake
- Vagal withdrawal produces almost instantaneous heart rate acceleration within a single heartbeat
- Direct sympathetic nerve firing and circulating hormones take several seconds to begin speeding the heart
- Noradrenaline activates alpha-1 receptors to constrict mesenteric and cutaneous blood vessels
- Epinephrine and sympathetic signaling stimulate beta-2 receptors to dilate skeletal muscle beds
- Differential receptor distribution routes cardiac output away from viscera and straight to active limbs
- Central command and muscle afferents shift the baroreflex operating setpoint to higher target pressures
- The baroreflex continues modulating beat-to-beat pressure around this new elevated workout threshold
- If baroreceptors were silenced rather than reset, blood pressure would swing wildly and uncontrollably
- Abdominal splanchnic veins act as compliant capacitive reservoirs holding up to a quarter of blood volume
- Sympathetic venomotor tone constricts these veins to rapidly shift stored blood into the vena cava
- Parasympathetic vagal withdrawal occurs milliseconds into acute stress to jumpstart heart rate
- Sympathetic neural outflow directly activates target organs within seconds via noradrenaline
- Adrenal medullary release and steroid hormones peak over minutes to hours to sustain metabolic mobilization
- Central chemoreceptors in the brainstem primarily monitor pH changes in cerebrospinal fluid.
- Arterial carbon dioxide readily crosses the blood-brain barrier to generate acidic hydrogen ions.
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 Body Systems Interlock 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.
When you suddenly dash up a flight of stairs, what allows your heart to accelerate in a split second?
Get it right to open this lesson and 11 more in the app.
Where How Body Systems Interlock takes you
- 1
Emergency Adjustments and Gas Exchange
- Reading the Acute Stress Shift
- Balancing Blood Gases and pH
- 2
Fluid Balance and Competing Priorities
- Defending Blood Pressure and Volume
- Managing the Heat and Circulation Conflict
2 sections · 4 units · 12 levels. Built to play, not to enroll.
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 Body Systems Interlock 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.
More Science on Tomo
How the Human Body Works
Discover how your organs, tissues, and fluids coordinate every second of the day. Learn the elegant mechanics behind how you move, breathe, fight disease, and stay alive.
How the Human Body Works
Discover the incredible machinery of human anatomy and physiology. Learn how your bones, muscles, nerves, and organs work together in real time to keep you moving, thinking, and alive.
Human Physiology Under Pressure
Uncover how the human body coordinates vital systems in real time when demands spike. Explore the mechanisms of blood flow regulation, gas exchange, fluid balance, and stress responses that keep you alive under load.
How the Human Body Fits Together
Explore the elegant architecture of your own body from the inside out. Learn how your skeleton, muscles, circulation, and vital organs coordinate to keep you upright, moving, and alive.
Mapping the Human Body
Discover how the living human body is built, organized, and engineered to function. Learn to read anatomical landmarks, understand how joints and muscles generate motion, and trace how internal organs coordinate life beneath your skin.
How the Human Body Works
Understand the living machinery beneath your skin. Discover how your organs collaborate, how muscles generate movement, and how your body regulates itself every second.
Start How Body Systems Interlock today.
Download Tomo, search How Body Systems Interlock, and play your first lesson in under a minute.