Question

The inner layer of a blood vessel is the

Answer 1

The inner layer which is also the thinnest layer, comprised of a single layer of endothelium supported by a subendothelial layer.

So choice C. Is your answer.

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Answer 2

C.
All arteries and veins contain three layers. The innermost layer is called the tunica intima. The muscular middle layer is called the tunica media, and the outermost layer is called the tunica adventitia. Because capillaries are only one cell layer thick, they only have a tunica intima.