When the diaphragm and external intercostal muscles contract,
A) expiration occurs.
B) intrapulmonary pressure increases.
C) intrapleural pressure decreases.
D) the volume of the lungs decreases.
E) All of the answers are correct.

Question

Quizplus · Accepted Answer

When the diaphragm and external intercostal muscles contract, it causes the chest cavity to expand, which decreases intrapleural pressure, leading to air being drawn into the lungs. This is part of the process of inhalation, not expiration.

When the Diaphragm and External Intercostal Muscles Contract