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What does the term Double circulation means?

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in the body there are parts that have double circulation.This means blood supply from two different circulatory systems.

The four different circulatory systems are:

1.splanchnic or general circulation of blood in the muscle and bones of the body.

2.The visceral circulation meaning the circulation of blood in the viscera.portal hepatic circulation is a typical example.Pulmonary circulation in the lungs as well as cerebral circulation in the brain are the other visceral circulations.

The anal canal has a meeting of both the porto-hepatic visceral circulation and the splanchnic circulation at the anal valves which cause pile or haemmorrhoid conditions.