Solution: (3) The urea–ornithine cycle occurs in the liver, hence the vein that leaves the liver has the most urea, which is the hepatic vein.
167. In mammals, which blood vessel would normally carry largest amount of urea? (1) Renal vein (2) Dorsal aorta (3) Hepatic vein (4) Hepatic portal vein
167. In mammals, which blood vessel would normally carry largest amount of urea? (1) Renal vein (2) Dorsal aorta (3) Hepatic vein (4) Hepatic portal vein