Question

Which of the following does NOT affect alveolar PO₂?

a) the rate of oxygen consumption by respiring tissues
b) alveolar ventilation
c) the PO₂ of inspired air
d) the volume of air contained in the alveoli
e) the humidification of air as it moves through the conducting zone

Answer 1

The volume of air contained in the alveoli does not affect alveolar PO₂. Other factors such as the rate of oxygen consumption by tissues, alveolar ventilation, the PO₂ of inspired air, and the humidification of air as it moves through the conducting zone affect alveolar PO₂.

Step-by-step explanation:

The volume of air contained in the alveoli does NOT affect alveolar PO₂. Alveolar PO₂ is primarily affected by factors such as the rate of oxygen consumption by respiring tissues, alveolar ventilation, the PO₂ of inspired air, and the humidification of air as it moves through the conducting zone.