Which vascular structure carries blood back to the heart?

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Multiple Choice

Which vascular structure carries blood back to the heart?

Explanation:
Veins are the vessels that carry blood back to the heart. They operate under lower pressure than arteries and often have valves that prevent backflow, with the return aided by surrounding muscles and the one-way flow toward the heart. Arteries, in contrast, move blood away from the heart at higher pressures with thicker walls. Capillaries are tiny exchange vessels between arteries and veins, where oxygen and nutrients pass to tissues. The lumen is simply the hollow interior space of a vessel, not a type of vessel itself.

Veins are the vessels that carry blood back to the heart. They operate under lower pressure than arteries and often have valves that prevent backflow, with the return aided by surrounding muscles and the one-way flow toward the heart. Arteries, in contrast, move blood away from the heart at higher pressures with thicker walls. Capillaries are tiny exchange vessels between arteries and veins, where oxygen and nutrients pass to tissues. The lumen is simply the hollow interior space of a vessel, not a type of vessel itself.

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