Capillaries: Walls are one cells thick, Gaseous exchange occurs here, Connect arteries and veins, Arteries: Carries blood away form the heart, Thick muscular walls, Small lumen, Carries blood under high pressure, Carry oxygenated blood, Veins: Carries blood towards the heart, Contain valves, Carries blood under low pressure, Thin elastic walls, Large lumen, Carry deoxygenated blood,

Blood vessels

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