Arteries: Thick elasticated muscular wall, Carries Oxygenated blood (except PA), High Blood pressure, Arterioles (small versions), Away from the heart, Pulse, Narrow lumen, Veins: Thin Muscle Wall, Carries De-oxygenated blood (except PV), Low Blood Pressure, One way valves, Venules (small versions), IN to the heart, Wide Lumen, Capillaries: Once cell thick walls, Diffusion, Large Surface area, Wrapped around alveoli,

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