Final answer:
Alveolar ventilation is the volume of air that reaches the respiratory zone each minute.
Step-by-step explanation:
The volume of air that reaches the respiratory zone each minute is referred to as alveolar ventilation. Alveolar ventilation is the amount of air that moves into and out of the alveoli, which are the structures in the respiratory system directly involved in gas exchange. It is important for maintaining the balance of oxygen and carbon dioxide in the body.