HISTOLOGY
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: -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.
Detailed explanation-2: -The transport of oxygen and carbon dioxide in the gas phase from the ambient environment to and from the alveolar gas/blood interface is accomplished through the tracheobronchial tree, and involves mechanisms of bulk or convective transport and diffusive net transport.
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