Question

what is the action of the diaphragm (d) and the external intercostal muscles (eim) during exhalation? d - contracts eim - relaxes d & eim - relaxes d - relaxes eim - contracts d & eim - contract

Explanation:

During exhalation, the diaphragm relaxes and moves upward, reducing the volume of the thoracic cavity. The external intercostal muscles also relax, causing the rib - cage to move downward and inward, further decreasing the thoracic cavity volume and increasing the air pressure inside the lungs, forcing air out.

Answer:

B. D & EIM - relaxes