A lack of impulses from the primary respiratory center to the respiratory muscles will initiate
A)contraction for expiration.
B)contraction for inspiration.
C)relaxation for expiration.
D)relaxation for inspiration.

Question

Quizplus · Accepted Answer

Relaxation for expiration is initiated because the primary drive for breathing comes from the respiratory center in the brainstem, which sends impulses to stimulate the muscles involved in inspiration. When these impulses are absent or reduced, the muscles relax, leading to passive expiration primarily due to the elastic recoil of the lungs and chest wall.

A Lack of Impulses from the Primary Respiratory Center to the Respiratory