Explain why the walls of capillaries are so thin ?
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Answer:
single capillary is so small that it allows only one blood cell to flow through it at a time. ... These thin walls easily allow water, oxygen, carbon dioxide, and other nutrient and waste substances to exchange between blood cells and the surrounding tissue.
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.
Explanation:
Capillaries are much thinner than arteries and veins, because their walls are made up of only a single layer of endothelial cells, the flat cells that line all blood vessels.
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