All of the following are stages in gas exchange in respiratory systems EXCEPT:
A) air moving across the system by bulk flow.
B) diffusion of O2 and CO2 across the respiratory membranes.
C) active transport of O2 into the circulatory system.
D) transport of gases by the circulatory system by bulk flow.
E) gas exchange from the circulation to the tissues by diffusion.
Correct Answer:
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