Chapter 21 - Blood Vessels and Circulation Flashcards
1
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21.1
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2
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Tunica externa: arteries vs veins
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The tunica externa, or tunica adventitia, is the outer layer of a blood vessel. It is a connective tissue sheath. In arteries, it contains collagen fibers with scattered bands of elastic fibers. In veins, it is generally thicker than the tunica media and contains networks of elastic fibers and bundles of smooth muscle cells. The connective tissue fibers of the tunica externa typically blend into those of adjacent tissues, stabilizing and anchoring the blood vessel.
3
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REVIEW THE REST!!!!!
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