The smallest blood vessels in the human body are called ____________.

The smallest blood vessels in the human body are called ____________.
A . arterioles
B. veins
C. venules
D. capillaries

Answer: D

Explanation:

Capillaries are the smallest blood vessels in the body. Arterioles are the connecting vessels between arteries and capillaries. Venules are the connecting vessels between capillaries and veins.

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