Which of the following is not found in mammal | vedclass

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(C) portal system is a system of blood vessels in which blood collected from one capillary bed is transported to another capillary bed before returnin

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Renal portal system

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(C) portal system is a system of blood vessels in which blood collected from one capillary bed is transported to another capillary bed before returning to the heart.In mammals,the $Hepatic$ portal system (connecting the digestive tract to the liver) and the $Hypophysial$ portal system (connecting the hypothalamus to the anterior pituitary) are present.However,the $Renal$ portal system,which carries blood from the hind limbs to the kidneys,is absent in mammals. It is typically found in lower vertebrates like amphibians and reptiles.

Column-$I$	Column-$II$
$P$. Single circulation	$I$. Fishes
$Q$. Incomplete double circulation	$II$. Amphibians and Reptiles
$R$. Complete double circulation	$III$. Crocodiles,Birds,and Mammals

Which of the following is not found in mammals?

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Match the following columns:
Column-$I$ Column-$II$
$P$. Single circulation $I$. Fishes
$Q$. Incomplete double circulation $II$. Amphibians and Reptiles
$R$. Complete double circulation $III$. Crocodiles,Birds,and Mammals

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