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Oxygen Moves from Alveoli to the Bloodstream ____

Question 29

Multiple Choice

Oxygen moves from alveoli to the bloodstream ____.  


A) because the partial pressure of oxygen is greater in alveoli than in the blood
B) mainly due to the activity of carbonic anhydrase in the red blood cells
C) against a concentration gradient
D) to equal the concentration of CO2 in the blood
E) by active transport

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