Expiration during quiet breathing
A) is an active process.
B) requires more muscle contractions than inspiration.
C) is due to contraction of the diaphragm and elevation of the ribs.
D) occurs when the diaphragm and external intercostal muscles relax.
E) is not affected by the elastic properties of the lungs.

Question

Quizplus · Accepted Answer

Expiration during quiet breathing is a passive process that occurs when the diaphragm and external intercostal muscles relax, allowing the chest cavity to decrease in volume and air to flow out of the lungs.

Expiration During Quiet Breathing