A) the tubule of kidney reabsorb urea in large amount
B) concentration of urea goes high in the blood because the tubules are not able to remove it from the blood
C) urea is produced in excess in the body
D) none of the above
Correct Answer: B
Solution :
In uraemia blood urea content is above 0.05%, but in elasmobranch fishes it ranges from 2.0-2.5%. The excess is used for osmoregulation.
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