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Sarah Elan · Answer 1 · 2022-07-07T17:54:09+0000

Answer:

Step-by-step explanation:

The muscle that is contracted, it allows the lungs to fill with air through diaphragm muscle.

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Blaque · Answer 2 · 2022-07-10T21:49:49+0000

Answer:

It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily. Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs.

Step-by-step explanation:

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