State two differences between arteries and veins. -Biology

State two differences between arteries and veins. -Biology
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ArteriesArteries 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.VeinsVeins 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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