Expiration occurs only when.....

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(B) Expiration (exhalation) is the process of moving air out of the lungs.This process occurs when the intra-pulmonary pressure (pressure inside the l

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Intra-pulmonary pressure is greater than the atmospheric pressure.

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(B) Expiration (exhalation) is the process of moving air out of the lungs.This process occurs when the intra-pulmonary pressure (pressure inside the lungs) becomes higher than the atmospheric pressure.When the diaphragm and external intercostal muscles relax,the thoracic volume decreases,which increases the pressure inside the lungs relative to the outside atmosphere,forcing air to move out.

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