Answer :
The portal system is an anatomical structure that is also observable in at least two other organs.
A portal system is one in which veins begin and end in capillaries. It transports nutrient-rich blood to the liver for purification before transporting it to the heart. The portal venous system transports capillary blood to the liver from the esophagus, stomach, small and large intestines, pancreas, gallbladder, and spleen. The portal vein is formed by the union of the splenic and superior mesenteric veins behind the pancreas's neck.
The hepatic portal system, the hypophyseal portal system, and (in non-mammals) the renal portal system are examples of such systems. The hepatic portal system gets its name from the fact that it connects capillaries in the intestines and other digestive organs to modified capillaries in the liver (hepatic sinusoids).
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