During expiration, the volume of the alveoli decreases as air is pushed out of the lungs. According to Boyle's law, pressure and volume are inversely related in a closed system. Therefore, as the alveolar volume decreases, the alveolar pressure increases to push air out of the lungs.

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During Expiration

Question 12

Multiple Choice

During expiration

A) increased alveolar volume causes increased alveolar pressure.
B) increased alveolar volume causes decreased alveolar pressure.
C) decreased alveolar volume causes increased alveolar pressure.
D) decreased alveolar volume causes decreased alveolar pressure.
E) decreased alveolar pressure caused increased alveolar volume.

Correct Answer: