Explain the mechanism of expiration.
(N/A) Expiration occurs when the diaphragm and the external intercostal muscles relax.
This relaxation causes the diaphragm and the sternum to return to their normal positions.
As a result,the thoracic volume decreases,which leads to a decrease in pulmonary volume.
This reduction in volume causes the intra-pulmonary pressure to increase to a level slightly above the atmospheric pressure.
Consequently,air is forced out of the lungs,a process known as expiration.
This relaxation causes the diaphragm and the sternum to return to their normal positions.
As a result,the thoracic volume decreases,which leads to a decrease in pulmonary volume.
This reduction in volume causes the intra-pulmonary pressure to increase to a level slightly above the atmospheric pressure.
Consequently,air is forced out of the lungs,a process known as expiration.
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