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Question

Which of the following has walls that are made up of a single layer of endothelial cells?

A
Arteries
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B
Veins
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C
Arterioles
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D
Capillaries
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Solution

The correct option is D Capillaries
Capillaries are the smallest of the body’s blood vessels. They are made of a single layer of endothelial cells and are the sites of transfer of oxygen and other nutrients from the bloodstream to other tissues in the body; they also collect carbon dioxide and waste materials for return to the veins.
Both the arteries and veins are made up of three layers - Tunica interna, Tunica media and the Tunica externa.

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