What are veins? Veins are elastic vessels that transport blood to the heart. The smallest veins in the body are called venules. They receive blood from the arteries via the arterioles and capillaries. The venules branch into larger veins which eventually carry the blood to the largest veins in the body, the vena cava. The blood is then transported from the vena cava to the right atrium of the heart. Structure of Veins: The venous wall consists of three layers: Vein Size
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