What happens during expiration?

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(A) Expiration occurs when the diaphragm and external intercostal muscles relax. $1$. During expiration,the diaphragm and the external intercostal mus

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Relaxation of the diaphragm and external intercostal muscles

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(A) Expiration occurs when the diaphragm and external intercostal muscles relax. $1$. During expiration,the diaphragm and the external intercostal muscles return to their resting positions. $2$. This movement reduces the volume of the thoracic cavity. $3$. The decrease in thoracic volume leads to an increase in pulmonary pressure relative to atmospheric pressure. $4$. Consequently,air is expelled from the lungs to the outside environment.

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