Ventilation
The exchange of air between the lungs and the atmosphere so that oxygen can be exchanged for carbon dioxide in the alveoli (the tiny air sacs in the lungs).</P> In pulmonary medicine, a distinction is made between pulmonary and alveolar ventilation.
Pulmonary ventilation refers to the total exchange of gas.
Alveolar ventilation refers only to the effective ventilation within the alveoli.</P> Not to be confused with psychological ventilation in which a person airs out their feeling and puts their problems into words.