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When the diaphragm and rib cage muscles relax, it is impossible to breathe. inspiration occurs. the chest cavity enlarges. expiration occurs.
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When the diaphragm and rib cage muscles relax,

it is impossible to breathe.


inspiration occurs.


the chest cavity enlarges.


expiration occurs.

User Mike Hixson
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1 Answer

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Expiration occurs. When the diaphragm and rib cage muscles relax you let air out. Kinda like a sense of relief
User Matt Whitehead
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