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Why are capillaries suitable for exchange of substances?

Answer and explanation

Correct answer: Their walls are very thin

The governing concept is efficient exchange between blood and body cells. Capillaries have extremely thin walls, generally only one cell thick, so oxygen and dissolved nutrients can diffuse from the blood into tissues, while carbon dioxide and other wastes can diffuse back into the blood. Their extensive network also provides a large exchange surface. Therefore option A is correct; thick walls would hinder diffusion, and the other choices describe unrelated functions.

Related tags

CapillariesExchangeBlood-VesselsLife ProcessesWorld Of LivingScienceClass 10 Mcq

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