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Question

Which one of the following blood vessel in mammals contains least amount of urea?

A
Hepatic portal vein
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B
Hepatic vein
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C
Dorsal aorta
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D
Renal vein
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Solution

The correct option is B Renal vein
Hepatic vein is the vein which carries the blood from the liver.
Hepatic portal vein supplies blood from liver to intestine.
Dorsal aorta is the renal artery which supplies blood to the kidney.
The blood in the renal vein will contain less urea than the renal artery, because having passed through the kidney, urea leaves the blood through pressure filtration at the glomerulus with only a small amount being passively reabsorbed at the proximal convoluted tubule.
Thus, the correct answer is option D.

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