Q.

In mammals, which blood vessel would normally carry largest amount of urea         [2016]

1 Hepatic vein  
2 Hepatic portal vein  
3 Renal vein  
4 Dorsal aorta  

Ans.

(1)

Hepatic vein carries largest amount of urea. Urea is produced in liver. Hepatic vein transports liver’s deoxygenated blood to heart for oxygenation.