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one cell thick

they connect arteries (from heart) to veins (to heart).

there are ALOT of them... every cell is within a few cells of one

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13y ago
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14y ago

Capillaries are tiny (extremely narrow) blood vessels, of approximately 5-20 micro-metres

(one micro-metre = 0.000001metre) diameter.

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Q: What is the structure of the capillaries?
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