3 years ago

WILL UP-VOTE What layer or layers of veins have muscles?

1 answer:

7 0

"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." - Google

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