Arteries: Carry blood away from the heart, Blood is carried at high pressure, Thick muscular wall, They carry mainly oxygenated blood, They have no valves, Veins: Carry blood towards the heart, Blood is carried at low pressure, Thin muscular walls, Carry mainly deoxygenated blood, They have valves, Capillaries: Thin walks, one cell thick, Allow for diffusion of gases,

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