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capillary

The Columbia Encyclopedia, Sixth Edition

capillary , microscopic blood vessel, smallest unit of the circulatory system . Capillaries form a network of tiny tubes throughout the body, connecting arterioles (smallest arteries ) and venules (smallest veins ). Through the thin capillary walls, which are composed of a single layer of cells, the nutritive material and oxygen in the blood pass into the body tissues, and waste matter and carbon dioxide in turn are absorbed from the tissues into the bloodstream.

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The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press

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capillary
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