Air enters the lungs during inspiration mainly because the pressure inside the lungs becomes
Options
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A.
Higher than atmospheric pressure
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B.
Lower than atmospheric pressure
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C.
Equal to zero
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D.
Unrelated to atmospheric pressure
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E.
Constantly higher than atmospheric pressure
Correct Answer (Detailed Explanation is Below)
B.
Lower than atmospheric pressure
Detailed Explanation
Expansion of the thoracic cavity lowers intrapulmonary pressure below atmospheric pressure, allowing air to flow into the lungs.
