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Health Sciences 9 Online
OpenStudy (anonymous):

Why are capillaries and not arteries or veins found in alveoli, nephrons, and villi?

OpenStudy (anonymous):

Capillaries are much smaller and more abundant vessels--they are found in and around structures which require more or faster access to the bloodstream. In alveoli, the capillaries are more efficient in diffusing oxygen and carbon dioxide, for example.

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