Which of the following is true of expiration during normal quiet breathing?
A) Internal intercostal muscles contract
B) External intercostal muscles and diaphragm contract
C) There is no active muscle contraction and the external intercostal muscles and diaphragm relax and lungs recoil
D) None of the above is correct

Question

Quizplus · Accepted Answer

During normal quiet breathing, expiration is a passive process where the diaphragm and external intercostal muscles relax, allowing the lungs to recoil and air to be expelled without active muscle contraction.

Which of the Following Is True of Expiration During Normal