Question

The diagram given below represents the liver, kidney and some associated blood vessels. Identify the vessel from the labelled parts A-D in which the blood will contain the lowest concentration of urea?
A. A
B. B
C. C
D. D

Answer 1

Explanation:

The blood vessel coming out from the kidney will contain the lowest concentration of urea (although kidneys contain only a small amount of urea to maintain osmolarity). And the blood vessel coming out from the liver will contain the highest concentration of urea.

Answer 2

A - Blood enters the liver through the hepatic artery.

B - Blood enters the kidney through the renal artery.

C - Blood leaves the kidney through the renal vein.

D - Blood leaves the liver through the hepatic vein.

C) Renal vein will contain the lowest concentration of urea.

• Urea is formed in the liver and not in the kidneys.
• Blood coming through renal arteries has the lowest concentration of urea because it is filtered out in the kidney itself.