What are arteries and veins
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The arteries deliver the oxygen-rich blood to the capillaries, where the actual exchange of oxygen and carbon dioxide occurs. The capillaries then deliver the waste-rich blood to the veins for transport back to the lungs and heart. Veins carry the blood back to the heart.
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arteries and veins have a big job to do. They're part of a transportation system that moves blood around. Arteries carry blood loaded with oxygen from your heart to the rest of your body. Veins deliver the blood, now without much of the oxygen, back to your heart.
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