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Blood Vessels and Circulatio4

Blood Vessels and Circulatio4 - tissue The tunica media the...

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Blood Vessels and Circulation The peripheral circulatory system can be divided into the systemic and the pulmonary vessels. The peripheral circulatory system and the heart are regulated to maintain sufficient blood flow to tissues. Functions of the Peripheral Circulation The peripheral circulation functions to carry blood, exchange nutrients and gases, transport hormones, regulate blood pressure, and direct blood flow. General Features of Blood Vessel Structure Blood is pumped from the heart through elastic arteries, muscular arteries, and arterioles to the capillaries. Blood returns to the heart from the capillaries through venules, small veins, and large veins. Except for capillaries and venules, blood vessels have three layers: The tunica intima consists of endothelium, basement membrane, and connective
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Unformatted text preview: tissue. The tunica media, the middle layer, contains circular smooth muscle and elastic fibers. The outer tunica adventitia is connective tissue. Arteries • Large elastic arteries have many elastic fibers but little smooth muscle in their walls and carry blood from the heart to smaller arteries with little decrease in pressure. • Muscular arteries have much smooth muscle and some elastic fibers and undergo vasodilation and vasoconstriction to control blood flow to different regions of the body. • Arterioles are the smallest arteries and have smooth muscle cells and a few elastic fibers and undergo vasodilation and vasoconstriction to control blood flow to local areas....
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