The diagram below represents part of a capill | vedclass

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(B) An alveolus is a tiny air sac in the lung. It is the actual part of the lung where the exchange of atmospheric oxygen $(O_2)$ and carbon dioxide $

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an alveolus

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(B) An alveolus is a tiny air sac in the lung. It is the actual part of the lung where the exchange of atmospheric oxygen $(O_2)$ and carbon dioxide $(CO_2)$ occurs with the blood. In the diagram,the exchange of gases ($O_2$ entering the blood and $CO_2$ leaving the blood) indicates that region $X$ is the alveolar space. $A$ glomerulus is a network of capillaries in the kidneys for filtration,a villus is a projection in the small intestine for nutrient absorption,and the liver is involved in metabolic processes like bile production.

The diagram below represents part of a capillary in a specific region of the human body. The region labeled $X$ represents part of

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