Arteries: Carry blood AWAY from the heart, Transports oxygenated blood, Thick walls, Aorta, Aterioles, HIGH blood pressure, Do NOT contain valves, Blood is LOW in CO2, Veins: Carry blood TOWARDS the heart, Transports deoxygenated blood, Medium thick walls, Superior and Inferior Vena Cava , Venules, LOW blood pressure, Contain valves, Blood is HIGH in CO2, Capillaries : Very thin walls, Smallest blood vessel, Functions in gas exchange,

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