Question

Which of the following vein has the maximum concentration of urea ?

• A. Renal vein
• B. Hepatic portal vein
• C. Hepatic vein
• D. None of the above

Answer 1

The correct option is C Hepatic vein

Human excrete nitrogenous waste in the form of urea. The ammonia produced as a metabolic waste is converted into urea in the liver. Thus the vein that carries blood from the liver will have the maximum concentration of urea. The vein that carries blood away from the liver is hepatic vein.
The vein that carries blood from the gastro-intestinal and spleen to the liver is called hepatic portal vein. The blood that flows in hepatic portal vein is rich in nutrients.
The vein that carries the blood away from the kidney is called renal vein. The kidney filters urea from the blood and excretes it in the form of urine. Thus the blood that goes out of the kidneys are filtered and is not rich in urea.