What are the smallest blood vessels in the human body?

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Answer 1 · 2017-11-27T11:58:08

Capillaries.

Capillaries are hollow tubular microscopic blood vessels 5 to 10 micrometres (µm) in diameter and having a wall one cell thick.

They are the smallest blood vessels in the human body. They form a network between the arterioles and venules, as seen below.