The normal partial pressure differences between inspired air and alveolar gas for O2, CO2, H2O, and N2 can be explained because of ________.
A. net movements of CO2 toward the alveoli with net movements of O2 and H2O into the capillaries
B. net movement of CO2 and N2 toward the alveoli and H2O movements toward the alveoli as respiratory water
C. net movements of CO2 toward the alveoli, O2 toward the alveoli, and H2O is added along the respiratory tract
D. net movements of CO2, O2, and H2O into the alveoli from blood capillaries
Answer: C
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