![]() The function of blood vessels is to deliver blood to the organs and tissues in your body. Veins then carry the blood back to your heart, and the process begins again.Capillaries have thin walls that allow oxygen, nutrients, carbon dioxide and waste products to pass through, to and from the tissue cells.The aorta (the main artery in your body) carries the blood from the left side of your heart to the rest of your body through many branches of arteries.Pulmonary veins move the blood oxygen-rich blood to the left side of your heart. ![]()
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