which blood vessels have valves in them ? why is it so
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Blood vessels carry oxygenated and deoxygenated blood around the body. There are three types of blood vessel, veins, arteries and capillaries. Arteries carry blood under pressure away from the heart, veins carry blood to the heart and they are not under pressure but contain valves to prevent backflow of blood.
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Veins have valves in their inner lining because blood doesn't flow with much pressure inside them so to prevent backflow of blood they are provided with valves.
Explanation:
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