What do mean by portal vein and portal system
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Simply, a system of blood vessels that begins and ends in capillaries is called portal system. Following is a diagram showing the blood circulation of the body. We can see hepatic portal vein here (a part of portal system), this vein begins in a capillary (of intestines) and ends in another capillary (of liver
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In the circulatory system of animals, a portal venous system occurs when a capillary bed pools into another capillary bed through veins, without first going through the heart. ... Portal venous systems are considered venous because the blood vessels that join the two capillary beds are either veins or venules.
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