When the diaphragm and external intercostal muscles contract,
A) the volume of the thorax decreases.
B) the lungs shrink.
C) the volume of the thorax increases.
D) expiration occurs.
E) the volume of the lungs decreases.

Question

Quizplus · Accepted Answer

When the diaphragm and external intercostal muscles contract, the volume of the thorax increases, leading to inhalation as the lungs expand to fill the increased space.

When the Diaphragm and External Intercostal Muscles Contract