Which vessel carries blood back to the heart?

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Multiple Choice

Which vessel carries blood back to the heart?

Explanation:
Blood flows through the circulatory system along two main directions: arteries carry blood away from the heart, and veins return it back to the heart. The vessel that returns blood to the heart is the vein. Veins typically carry deoxygenated blood in systemic circulation, though there are exceptions like the pulmonary veins that bring oxygenated blood to the heart. Arteries carry blood away from the heart, capillaries are the tiny exchange vessels between arteries and veins, and the lumen is simply the hollow interior space of a vessel.

Blood flows through the circulatory system along two main directions: arteries carry blood away from the heart, and veins return it back to the heart. The vessel that returns blood to the heart is the vein. Veins typically carry deoxygenated blood in systemic circulation, though there are exceptions like the pulmonary veins that bring oxygenated blood to the heart. Arteries carry blood away from the heart, capillaries are the tiny exchange vessels between arteries and veins, and the lumen is simply the hollow interior space of a vessel.

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