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The middle layer, tunica media, consists of concentric layers of smooth muscle cells, elastic fibers, collagen fibers, and
figure 8-5 A, Diagram of a typical artery showing the three layers: tunica intima, tunica media, and tunica adventitia. b, Comparison of muscular artery (left) and accompanying vein (right).
The tunica media of these vessels is made up of layers of elastic membrane, which makes them efficient at absorbing the pressure changes that accompany each heartbeat.
The tunica media of the distributing arteries is made of up to 40 layers of smooth muscle cells that regulate blood flow in response to nervous system or hormonal input.
The tunica media is made of one to five lay- ers of smooth muscle cells and a few elastic fibers.
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