What are blood vessels composed of?

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(D) Blood vessels,such as arteries and veins,are composed of three distinct layers:$1$. Tunica intima: The innermost layer,consisting of a lining of e

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Layers of endothelium,connective tissue,and muscle fibers

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(D) Blood vessels,such as arteries and veins,are composed of three distinct layers:$1$. Tunica intima: The innermost layer,consisting of a lining of endothelium.$2$. Tunica media: The middle layer,composed of smooth muscle fibers and elastic fibers.$3$. Tunica externa (or adventitia): The outermost layer,composed of connective tissue with collagen fibers.Therefore,blood vessels are composed of endothelium,connective tissue,and muscle fibers.

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