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Tunica Adventitia

What is the tunica adventitia?

The tunica adventitia is the strong outer covering of arteries and veins. It is composed of connective tissue as well as collagen and elastic fibers. These fibers allow the arteries and veins to stretch to prevent overexpansion due to the pressure that is exerted on the walls by blood flow.

Image courtesy of Carolina Biological Supply/Access Excellence

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