Q.

Inspiration can occur only when

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a

atmospheric pressure is greater than or equal to 760 mm Hg

b

intrapleural pressure is greater than the alveolar pressure

c

the alveolar pressure is less than the atmospheric pressure

d

intrapleural pressure is greater than the atmospheric pressure

answer is C.

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Detailed Solution

Inspiration can occur only when the alveolar pressure is less than the atmospheric pressure, i.e., there is a negative pressure in the lungs with respect to atmospheric pressure. Intrapleural pressure is always lesser than the alveolar pressure.

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