When the diaphragm contracts, it partially
A) descends into the abdominal cavity.
B) ascends into the thoracic cavity.
C) fills the pleural cavity with air.
D) fills the pleural cavity with serous fluid.
E) forces air from the lungs.

Question

Quizplus · Accepted Answer

When the diaphragm contracts, it moves downward into the abdominal cavity, increasing the volume of the thoracic cavity and decreasing the pressure inside, which helps draw air into the lungs.

When the Diaphragm Contracts, It Partially