Diffusion of respiratory gases takes place at the:
a. alveolocapillary membrane.
b. visceral pleurae.
c. parietal pleurae.
d. respiratory center.
ANS: A
Diffusion of respiratory gases takes place across the alveolocapillary membrane. The visceral and parietal pleurae are the linings of the lung; gas exchange does not occur here. The respiratory center is where impulses to the respiratory muscles are generated.
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