Biology / Bio 3207 · Atom · ~20 seconds
Capillary Structure and Exchange
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A capillary wall is a single cell layer thick, allowing direct exchange of gases, nutrients, and waste between blood and tissue across the shortest distance.
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Oxygen and nutrients diffuse out into tissue while carbon dioxide and waste diffuse in, at the same stretch.
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Only capillaries exchange with tissue directly — arteries and veins mainly transport blood.