Write a short note on Urinary tract of frog
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The portal system is defined as a system of blood vessels in which veins carrying blood from different parts of the body is first broken up into capillaries in another organ like kidney or liver then the blood is collected by another set of capillaries which unite to form another vein that carries blood to the heart.
Portal vein is therefore originates from capillaries and terminates as capillaries. Thus it is also called double capillaries system.
Generally veins collect blood from different parts of the body and bring it to the heart. However, there are some veins which before reaching the heart take the blood to some other organs where they form network of capillaries. These veins are called portal veins
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