In the human gas exchange system,
A) the lungs and airways are completely collapsed after a forceful exhalation.
B) the average PO2 concentration of air inside the lungs is always lower than that in the air outside the lungs.
C) the PO2 of the blood leaving the lungs is greater than that of the exhaled air.
D) the amount of air that is moved per breath during normal, at-rest breathing is termed the total lung capacity.
E) O2 and CO2 are actively transported across the alveolar and capillary membranes.
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