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Answer : 3 their walls are only one cell thick Explanation : Answer: C) their walls are only one cell thick Explanation: Capillaries Tiny blood vessels connecting arteries to veins. These blood vessels carry oxygenand nutrients to individual cells. Capillaries are the smallest blood vessels in the body, and havewalls only one or two cells thick. (Their diameter is 5 to 10 micrometers, or 5 to 10 millionths ofa meter.) Capillaries connect arterioles and venules, which are the smaller extensions of the larger arteries and veins.

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