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Sir if oxygenated blood is present in a bld vessel then it is called as an artery and if the bld vessel contains deoxygenated blood then it is called as a vein. But in our heart (pulmonary artery) nd umbilical artery contains deoxygenated blood instead of oxygenated blood. So y we r not saying it as a pulmonary vein and umbilical vein as it contains deoxygenated blood?
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becoz of the structural make up...structurally these are the only two exceptions in body that are named rversely becoz arteries are thick and veins are thin structurally and pulmonary vein is thick and carries oxygenated blood ..thats the reason
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