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Arteries carry blood away from the heart whereas/or veins carry blood towards the heart.M2: Arteries have much thicker walls than veins (due to the thicker muscle and elastic layers) M3: Veins tend to have valves (this prevents backflow)

Arteries carry blood away from the heart whereas/or veins carry blood towards the heart.M2: Arteries have much thicker walls than veins (due to the thicker muscle and elastic layers) M3: Veins tend to have valves (this prevents backflow) 

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