During exhalation,
A) the pressure in the thoracic cavity is less than the pressure within the lungs.
B) the pressure in the thoracic cavity is greater than the pressure within the lungs.
C) the diaphragm moves downward and becomes more flattened.
D) the chest cavity volume increases.
E) movement of the diaphragm is inhibited.

Question

Quizplus · Accepted Answer

During exhalation, the diaphragm relaxes and moves upward, decreasing the volume of the thoracic cavity and increasing the pressure, which becomes greater than the pressure within the lungs, forcing air out.

During Exhalation