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Q. Which one is absent in man?

UP CPMTUP CPMT 2006

Solution:

Renal portal system is well developed in fishes and amphibians, reduced in reptiles & birds and is absent in mammals. This system carries blood from the posterior region of body to the kidney by renal portal vein. Hepatic portal system is found in all chordates. Hypophysial hypothalamotracts is present in higher vertebrates (amphibians, reptiles, birds & mammals).