The Diaphragm _______

Question

The diaphragm _______.
A) increases the volume of the chest cavity during inspiration
B) elevates the ribs during expiration
C) depresses the ribs during inspiration
D) decreases the volume of the chest cavity during inspiration

Accepted Answer

The diaphragm is a dome-shaped muscle that separates the thoracic and abdominal cavities. During inspiration, it contracts and flattens, increasing the volume of the thoracic cavity and thereby allowing air to rush into the lungs.