Free About 1 hr0 learners Rev. 2026-10-28 0

Somewhere just below your ribs, two filters the size of your fists are screening the watery part of your blood dozens of times a day and handing back almost everything they catch. Meanwhile a sheet of muscle you never think about is inflating your lungs, and a cluster of cells in your heart is firing on its own schedule, needing no instruction from your brain. Your body runs thousands of quiet negotiations at once, and most of them only come to your attention when one goes wrong.

Here you will see how those negotiations work: why a fever is a choice your body makes, why the urge to breathe has little to do with oxygen, what a vaccine actually teaches your cells, and why astronauts come home with thinner bones. You will also meet the people, willing and otherwise, whose bodies taught medicine what it knows. Afterward a blood pressure reading, a nutrition label or a doctor's explanation should feel less like a foreign language and more like a description of something you live inside.

Levels

  1. 1 1. From Cells to Systems 5-question quiz
  2. 2 2. The Heart and Circulation 5-question quiz
  3. 3 3. Lungs and Breathing 5-question quiz
  4. 4 4. Digestion and Nutrition 5-question quiz
  5. 5 5. The Immune System 5-question quiz
  6. 6 6. Hormones 5-question quiz
  7. 7 7. The Kidneys 5-question quiz
  8. 8 8. Bones, Muscles and a Lifetime 5-question quiz

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