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What major purpose do thin capillary walls serve in the body?

Answer and explanation

Correct answer: Exchange of substances between blood and tissues

Capillaries are microscopic vessels connecting small arteries and veins near body cells. Their walls are only about one cell thick, so the diffusion distance is short. Oxygen and nutrients can move from blood into tissues, while carbon dioxide and other wastes move into the blood. This efficient exchange is the purpose described in option A. Capillaries do not pump blood, transport food to the stomach, or control urine release.

Related tags

CapillariesDiffusionTissue-ExchangeBlood-TransportLife ProcessesWorld Of LivingScienceClass 10 Mcq

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