Deep labored inhalations involve contraction of all of the following muscles EXCEPT the
A)sternocleidomastoid
B)diaphragm
C)scalene muscles
D)external intercostals
E)internal intercostals

Question

Quizplus · Accepted Answer

During deep labored inhalations, the muscles involved include the sternocleidomastoid, diaphragm, scalene muscles, and external intercostals, all of which help expand the thoracic cavity and decrease intrathoracic pressure to allow air to flow into the lungs. The internal intercostals, however, are primarily involved in forced exhalation, not inhalation, by aiding in decreasing the volume of the thoracic cavity.

Deep Labored Inhalations Involve Contraction of All of the Following