During respiration, the internal intercostals:
A) increase the force of muscular contraction.
B) decrease the lateral diameter during expiration.
C) decrease the intrathoracic space.
D) increase elastic recoil during expiration.

Question

Quizplus · Accepted Answer

The diaphragm is the dominant muscle during respiration. It contracts and pushes downward during inspiration to increase the intrathoracic space. The external intercostal muscles increase the AP diameter during inspiration and the internal intercostals decrease the lateral diameter during expiration.

During Respiration, the Internal Intercostals