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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Watch this video to reinforce the major body systems and how they interact to keep the body alive and in homeostasis.
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.