Question

Blood of which vessel in mammals carries least percentage of urea :-

• A. Dorsal aorta
• B. Renal vein
• C. Renal artery
• D. Hepatic vein

Answer 1

The correct option is B Renal vein

The blood vessel that contains the lowest concentration of urea is the Renal Vein. Urea is excreted out of the kidneys, so the blood vessel that contains the lowest concentration of urea is the one that drains the blood, which is the renal vein.

The dorsal aorta is a blood vessel in a single-pass circulatory system that carries oxygenated blood from the gills to the rest of the body.

The renal arteries are paired arteries that supply the kidneys with blood. The renal arteries carry a large portion of total blood flow to the kidneys.

Hepatic vein- it is the vein present in the liver. Urea is produced in the liver so this vein carries maximum amount urea.
So, the correct answer is 'renal vein'.