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olasank [31]
2 years ago
14

PLEASE HELP

Biology
1 answer:
icang [17]2 years ago
3 0

Answer:

B

Explanation:

I’m smart dude

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During normal inhalation, contraction of the diaphragm and the contraction of external intercostals expands the chest cavity. The increased volume of the thoracic cavity results in reduced alveolar pressure than the atmospheric pressure to facilitate the flow of air into the lungs in response to the pressure gradient.

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