In pulmonary ventilation, the movement of gases is between the atmosphere and the alveoli of the lungs.
It is the process of inhalation and exhalation of air from the lungs. This happens because of the difference of pressure due to contraction and relaxation.
Inspiration occurs intrapleural cavity enlarges due to diaphragm's contraction which pulls it down. intrapleural cavity also occurs when ribs are elevated.
In pulmonary ventilation, three different pressures are included; Atmospheric pressure, Interalveolar pressure, Intrapleural pressure.
The pressure outside the body is known as atmospheric pressure. Pressure inside the alveoli of the lungs is known Interalveolar pressure. The pressure in the pleural cavity is known as Intrapleural pressure.
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