Artery: Carry blood away from heart, Have a narrow channel , Have thick muscular walls, Blood at high pressure, Capillary: Carry blood around tissues such as lungs and muscle, Have walls only one cell thick, Allow gas exchange to take place, Blood at very low pressure, Form networks to increase surface area, Vein: Carry blood to the heart, Have a wide channel, Have thinner walls, Blood at low pressure, Contain valves to prevent backflow,

National 5 Blood Vessels

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