If anything decreases alveolar PO₂, how does that affect the alveolar-blood oxygen pressure gradient?
A)Anything that decreases alveolar PO2 tends to increase the alveolar-blood oxygen pressure gradient and, therefore, tends to increase the amount of oxygen entering the blood. B)Anything that decreases alveolar PO2 tends to decrease the alveolar-blood oxygen pressure gradient and, therefore, tends to decrease the amount of oxygen entering the blood. C)Anything that decreases alveolar PO2 tends to increase the alveolar-blood diffusion rate and, therefore, tends to increase the amount of oxygen entering the blood. D)Anything that decreases PO2 tends to increase arterial-blood PO2 and, therefore, tends to decrease the amount of oxygen entering the blood.