First slide

Mechanism of Breathing

Question

Inspiration occurs when

Easy

A

the volume of the lung increases while the pressure in the lung decreases
B

the volume of the lung decreases while the pressure in the lung increases
C

the volume of the lung increases while the pressure in the lung increases
D

the volume of the lung decreases while the pressure in the lung decreases

Solution

An increase in pulmonary volume decreases the intra-pulmonary pressure to less than the atmospheric pressure which forces the air from outside to move into the lungs, i.e., inspiration.

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