Diffusion of gases in the lung is decreased, as in pulmonary edema or pneumonia, by causing an increase in alveolar:
A) Gas pressure difference
B) Size and surface area
C) Anatomic shunting of blood
D) Capillary membrane thickness
Ans: D
Feedback:
Diffusion is adversely affected by any condition that impedes the movement of gas by thickening the capillary membrane. A decrease in gas pressure difference will slow gas exchange. Increased alveolar size and surface area and shunting will increase diffusion rate.
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