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Lungs do not need to contain muscle tissue because their function is to exchange gases (oxygen and carbon dioxide). The diaphragm is a muscle just under your ribs that contracts and relaxes to expand and deflate the chest cavity.

As the diaphragm does its job, air floods into the lungs (which are more or less bags of tissue). The reason the air floods into the lungs has to do with air pressure and the tendency of molecules to move to places where they will be less crowded.

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13y ago
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14y ago

The main muscle that controls breathing is the diaphragm, which forms the "floor" of the cavity the lungs are inside.

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Q: Why do lungs have no muscle built in them?
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Are the lungs made out of muscle?

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Is the lungs a muscle?

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