Each of the following factors affects the rate of external respiration except the
A)PO₂ of the alveoli.
B)PCO₂ of the blood.
C)thickness of the respiratory membrane.
D)PN₂ of the alveoli.
E)solubility of oxygen in plasma.

Question

Quizplus · Accepted Answer

PN₂ of the alveoli has no direct effect on the rate of external respiration. The primary factors affecting external respiration are the PO₂ and PCO₂ gradients across the respiratory membrane and the solubility of oxygen in plasma. The thickness of the respiratory membrane also affects the rate of external respiration, as a thicker membrane can impede diffusion of gases.

Each of the Following Factors Affects the Rate of External