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Question

Complete loop of Henle is found in

A
Amphibia
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B
Reptilea
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C
Birds
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D
Mammals
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Solution

The correct option is D Mammals
Mammals have developed and complete U- shaped loop of Henle between the proximal and distal convulated tubule of metanephric kidney. It reabsorbs water and ions from urine. Loop of Henle is absent in fishes, amphibians and reptiles. Birds are the only group of vertebrates other than mammals that have the capability of elaborating a urine more concentrated than the plasma, due to the presence of loop of Henle but loop of Henle is rudimentary in birds.
Therefore, the correct answer is option D.

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