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There are two types of blood vessels in the circulatory system of the body: arteries that carry oxygenated blood from the heart to various parts of the body and veins that carry blood towards the heart for purification.
Best Answer: Veins carry blood back towards the heart. Because veins are narrow (unlike, say, arteries), the use the valves to build up pressure, allowing blood to be moved back to the heart for oxygenation. The valves are also used to prevent the back-flow of blood, so the blood doesn't move away from the heart.