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In the mammals, which blood vessel would normally carry largest amount of urea?
A
Dorsal Aorta
B
Hepatic Vein
C
Hepatic Portal Vein
D
Renal Vein
Explanation
Urea made in the liver leaves through the hepatic vein.
Detailed Solution
Proteins and amino acids are metabolised in the liver; the $-NH_2$ of amino acids is converted into urea, which is collected into the hepatic vein and later filtered in the kidney.