Question

select all that apply
choose all activities that are associated with forced exhalation.

sternum moves posteriorly
diaphragm relaxes
diaphragm contracts
internal intercostals contract
external intercostals contract

Explanation:

Forced exhalation involves the contraction of internal intercostal muscles (which pull the ribs downward and inward) and relaxation of the diaphragm (allowing it to move upward). The sternum moves posteriorly as the thoracic cavity volume decreases. The diaphragm contracts during inhalation (not forced exhalation), and external intercostals contract during inhalation (to raise the ribs).

Answer:

sternum moves posteriorly, diaphragm relaxes, internal intercostals contract