Question

Which among the following is not found in mammals?

• A. Hepatic portal system
• B. Hypophyseal portal system
• C. Renal portal system
• D. Hepatic and hypophyseal portal system

Answer 1

The correct option is C Renal portal system

Renal portal system is an arterial portal system, in which blood from the posterior body enters and pass on to the caudal venacava. It is present in non-mammals like fishes, reptiles, bird and amphibians.
Mammals possess hepatic portal system and hypophyseal portal system.
Thus, the correct answer is C.