MEDICAL
ARTERIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Oxygen and carbon dioxide are transported between the blood and alveoli by way of
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exocytosis and endocytosis by endothelial cells
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diffusion from areas of higher concentration to lower concentration
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pinocytosis using fluid-filled vesicles
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active transport (using ATP) by protein carriers of endothelial cells
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Explanation:
Detailed explanation-1: -Oxygen is carried both physically dissolved in the blood and chemically combined to hemoglobin. Carbon dioxide is carried physically dissolved in the blood, chemically combined to blood proteins as carbamino compounds, and as bicarbonate.
Detailed explanation-2: -Once the venous blood returns to the lungs, the carbon dioxide diffuses out of the bloodstream, through the capillaries, and into the alveoli from where it is expelled, during which time oxygen simultaneously binds with hemoglobin to be carried back to the tissues.
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