3. When the diaphragm and muscle contracts, the___
A.lungs expand
Blungs do not change
C.lungs deflate
D.thoracic cavity decreases in size
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3. When the diaphragm and muscle contracts, the___
A.lungs expand
Blungs do not change
C.lungs deflate
D.thoracic cavity decreases in size
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Answer:
Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs. Upon exhalation, the diaphragm relaxes and returns to its domelike shape, and air is forced out of the lungs.
Explanation:
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