Expiration occurs due to

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(A) Expiration is the process of moving air out of the lungs when the pressure within the lungs is higher than the atmospheric pressure.During normal

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Relaxation of diaphragm and external intercostal muscle

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(A) Expiration is the process of moving air out of the lungs when the pressure within the lungs is higher than the atmospheric pressure.During normal quiet breathing,expiration occurs due to the relaxation of the diaphragm and the external intercostal muscles.This relaxation causes the diaphragm and sternum to return to their normal positions,which decreases the thoracic volume and consequently the pulmonary volume,leading to an increase in intrapulmonary pressure and the expulsion of air.

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