Compared with carbon dioxide, what is the rate of diffusion of oxygen across the alveolar-capillary membrane? A. Higher because of oxygen’s smaller molecular weight B. Higher because of oxygen’s...

Compared with carbon dioxide, what is the rate of diffusion of oxygen across the alveolar-capillary membrane?

A. Higher because of oxygen’s smaller molecular weight

B. Higher because of oxygen’s greater solubility

C. Higher because of oxygen’s greater affinity for hemoglobin

D. Lower because oxygen is less soluble than CO2

E. Lower because of oxygen’s greater affinity for hemoglobin