Which of the following has no muscular wall?

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(D) . Capillaries are the smallest blood vessels and consist of a single layer of endothelial cells resting on a basement membrane. Unlike arteries,ve

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Capillary

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(D) . Capillaries are the smallest blood vessels and consist of a single layer of endothelial cells resting on a basement membrane. Unlike arteries,veins,and arterioles,they lack a tunica media (muscular layer) and tunica externa,which allows for the efficient exchange of gases,nutrients,and waste products between the blood and surrounding tissues.

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