When do the expiratory muscles contract?

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Question

(C) Normal breathing and normal expiration are passive processes that rely on the elastic recoil of the lungs and the relaxation of the diaphragm and

Vedclass · Accepted Answer

Forced expiration

Vedclass · Answer

(C) Normal breathing and normal expiration are passive processes that rely on the elastic recoil of the lungs and the relaxation of the diaphragm and external intercostal muscles. However,forced expiration is an active process that requires the contraction of expiratory muscles,specifically the internal intercostal muscles and abdominal muscles,to decrease the thoracic volume rapidly.

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