what is the difference between arteries and veins?
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Veins have a relatively thin layer of smooth muscle in the wall, and often the veins have a misshapen or collapsed look, whereas arteries maintain a tight cylindrical shape. Veins also have valve flaps to keep the blood from moving backward in the vessel. These valves resemble the semilunar valves of the heart.
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Arteries and veins are two of the body's main type of blood vessels through which blood flow in the body. The arteries carry oxygenated blood away from the heart while the veins carry deoxygenated blood from the tissue capillaries back towards the heart.
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