The renal vein and the pulmonary vein both carries oxygenated blood then why only the pulmonary vein is known as oxygen carrying blood
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blood is in the vein because it
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Answer:
this is because
Explanation:
due to the fact that all veins carry blood towards the heart and the blood from the lungs must go back to the heart hence making it to carry the oxygenated blood to the heart to be pumped to the rest of the body
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