The two processes of pulmonary ventilation (breathing) are internal (tissue) respiration and external (pulmonary) respiration.

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Pulmonary ventilation (breathing) refers specifically to the movement of air into and out of the lungs, which facilitates external (pulmonary) respiration (exchange of gases between the lungs and the blood). Internal (tissue) respiration, on the other hand, involves the exchange of gases between the blood and body tissues, and is not a component of pulmonary ventilation.

The Two Processes of Pulmonary Ventilation (Breathing) Are Internal (Tissue)