PATHOLOGY MCQ
BLOOD VESSELS
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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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swapping molecules
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active transport (using ATP) by protein carriers of endothelial cells
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Explanation:
Detailed explanation-1: -Diffusion is a process in which transport is driven by a concentration gradient. Gas molecules move from a region of high concentration to a region of low concentration. Blood that is low in oxygen concentration and high in carbon dioxide concentration undergoes gas exchange with air in the lungs.
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.
There is 1 question to complete.