Explore how the body's major systems work together — from cells to organs — to keep every living organism alive and in balance.
Life is organized in levels. Each level is built from the one below — and if any level fails, everything above it is affected.
No body system works alone — they are constantly depending on and supporting each other. Here's a quick reference for the key interactions.
Every term below appeared in this lesson. Click any pill to jump to its explanation.
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15 questions on the major body systems, their functions, and how they work together. Fill in your info below — your score will be sent to your teacher when you submit.
The lesson is just the beginning — go deeper, test your skills, or see how it all connects.