The smallest blood vessels which are one-cell thick, are called ______.
A) vena cava B) arteries C) veins D) capillaries
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D)capillaries
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Answer. Capillaries.
Capillaries are very tiny blood vessels — so small that a single red blood cell can barely fit through them. They help to connect your arteries and veins in addition to facilitating the exchange of certain elements between your blood and tissues.
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