When the inspiratory muscles contract,
A) thoracic volume increases.
B) pleural pressure increases.
C) the alveolar pressure increases.
D) expiration occurs.
E) thoracic volume decreases.

Question

Quizplus · Accepted Answer

When the inspiratory muscles contract, such as the diaphragm and the external intercostal muscles, the thoracic cavity's volume increases. This expansion leads to a decrease in pressure within the lungs compared to the atmospheric pressure, allowing air to flow into the lungs.

When the Inspiratory Muscles Contract