What does NOT happen when the diaphragm contracts?
A) The volume of the thoracic cavity increases.
B) Lung volume increases as the lungs are forced to expand.
C) The intra-alveolar pressure increases.

Question

Quizplus · Accepted Answer

When the diaphragm contracts, it moves downward, creating more space in the thoracic cavity, leading to an increase in lung volume. This decrease in pressure leads to air being sucked into the lungs, causing the intra-alveolar pressure to decrease, not increase. Therefore, option C is incorrect, and options A and B are correct.

What Does NOT Happen When the Diaphragm Contracts