why is it not correct to say that all arteries carry oxygenated blood and all veins carry de-oxygenated blood??
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it is not correct to say that all arteries carry oxygenated blood and all veins carry de oxygenated blood because of a few exceptions that are -pulmonary and umbilical vein carries oxygenated blood and pulmonary arteries carry de oxygenated blood
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it is not correct because pulmonary artery carries de-oxygenated blood and pulmonary vein carries oxygenated blood.
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