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It contracts and relaxes to help pull air into the lungs and push it back out. The diaphragm contracts and moves lower which expands the ribs and allows air to move into the lungs. When it relaxes, the ribs contract and push air back out of the lungs.

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Q: What does the human diaphragm do?
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What is the human diaphragm made out of?

The diaphragm is not made out of bone, but the diaphragm is a muscle.


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