Which event occurs during inspiration but not expiration?
A) rib cage moves out and up.
B) diaphragm relaxes and moves up.
C) pressure in the lungs increases.
D) air is pushed out of the lungs.
E) rib cage moves down and inward.

Question

Quizplus · Accepted Answer

During inspiration, the rib cage moves out and up as the intercostal muscles contract to increase the volume of the thorax and expand the lungs. This movement does not occur during expiration, during which the rib cage moves down and inward as the intercostal muscles relax.

Which Event Occurs During Inspiration but Not Expiration