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Veins are blood vessels that carry deoxygenated blood towards the heart. They have valves to prevent backflow and rely on skeletal muscle contractions to aid blood flow.
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Arteries: Blood vessels that carry oxygenated blood away from the heart under high pressure.
Capillaries: Microscopic blood vessels where exchange of gases, nutrients, and waste occurs between blood and tissues.
Valves (in veins): Structures within veins that ensure unidirectional flow of blood toward the heart by preventing backflow.