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|Artery||Have thick walls and carry oxygenated blood away from the heart. The one exception is the artery that carries oxygenated blood toward the heart.|
|Vein||Carries unoxygentated blood toward the heart. Has thin walls. The one exception is the vein that carries unoxygenated blood away from the heart to the lungs.|
|Capillary||Very small vessels that make connections between arteries and veins, and between the circulatory system and other systems.|