Expiration during normal quiet breathing is a passive process requiring no muscular contractions.

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Quizplus · Accepted Answer

Expiration during normal quiet breathing is indeed a passive process that does not require any muscular contractions. It is mainly caused by the natural recoil of the lungs and chest wall as the volume of the thoracic cavity decreases, leading to a decrease in air pressure inside the airways, which forces air out of the lungs.

Expiration During Normal Quiet Breathing Is a Passive Process Requiring