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Arteries and Veins

The circulatory system is made up of arteries and veins (see fig. 1). Arteries carry oxygenated blood from the heart to the body. Capillaries are the tiny vessels that connect the smallest arteries and veins (see fig. 2). Capillaries exchange oxygen and nutrients for carbon dioxide and waste products with the body’s cells. The veins carry deoxygenated blood back to the heart.

Figure 1: Arteries and veins of the body.

Figure 2: Capillary bed between a small artery and vein.

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