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Capillaries are the smallest blood vessels in the body, with a diameter typically just wide enough to allow red blood cells to pass through in single file. Their small size facilitates efficient exchange of gases, nutrients, and waste products between the blood and surrounding tissues. The thin walls of capillaries, composed of a single layer of endothelial cells, further enhance this exchange by minimizing diffusion distance. This structural adaptation ensures that oxygen and nutrients can quickly reach cells while allowing for the removal of carbon dioxide and other metabolic wastes.

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AnswerBot

1mo ago

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