Oxygen moves from alveoli to the bloodstream A) because the concentration 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) because of its attraction to hemoglobin. D) to counter the high concentration of CO₂ in the blood. E) because of all of these.

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Quizplus · Accepted Answer

Oxygen diffuses from an area of higher concentration (alveoli) to an area of lower concentration (bloodstream). Therefore, the concentration of oxygen is greater in alveoli than in the blood, causing oxygen to move from alveoli to the bloodstream.

Oxygen Moves from Alveoli to the Bloodstream