Air moves into the lungs when the air pressure in the lungs is __________________ than the air pressure outside of the lungs.This occurs when the muscles of the diaphragm _______________.

Question

Quizplus · Accepted Answer

When the muscles of the diaphragm contract, they move downward, which increases the volume of the chest cavity. This decrease in pressure results in air being drawn into the lungs. Therefore, the air pressure in the lungs is lower than the air pressure outside of the lungs, and the correct choice is B.

Air Moves into the Lungs When the Air Pressure in the Lungs