Question

4. When the diaphragm relaxes, lungs __________and when diaphragm contacts , lungs _________.​

Answer 1

Answer:

When the diaphragm contracts, the ribcage expands and the contents of the abdomen move downward. This results in a larger chest volume, which decreases air pressure inside the lungs. With lower air pressure inside than outside the lungs, air rushes into the lungs. When the diaphragm relaxes, the opposite events occur.

Answer 2

Answer:

contracts

expands

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Explanation: