Vessels that carry blood back to the heart,operate under low pressure,and are relatively thin-walled are called:

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Veins carry blood back to the heart, and have thinner walls and operate under low pressure. Arteries carry blood away from the heart, have thicker walls, and operate under high pressure. Arterioles are smaller arteries that help regulate blood flow, and capillaries are the tiniest blood vessels where gas exchange and nutrient exchange occur.

Vessels That Carry Blood Back to the Heart,operate Under Low