A system of blood vessels where the blood passes from arteries to capillaries to veins - then through a second set of capillaries - and then through a final set of veins. THere are two portal systems in the body - the hepatic portal system and the hy

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1. A system of blood vessels where the blood passes from arteries to capillaries to veins - then through a second set of capillaries - and then through a final set of veins. THere are two portal systems in the body - the hepatic portal system and the hy