State two differences between arteries and veins.
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Arteries: Arteries carry oxygenated blood, away from the heart except pulmonary artery. These are thick-walled, highly muscular except arteries of cranium and vertebral column. Valves are absent. Blood in arteries moves with pressure.
Veins: Veins carry deoxygenated blood, towards the heart except pulmonary veins. These are thin-walled. Valves are present which provide unidirectional flow of blood.Blood in veins moves under very low pressure.
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artries -- they dont have valaves but viens have to protect the reverse flow of blood..
artries are thick walled but viens r thin walled..
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