System of blood circulation in the human body is what makes human being alive, but you do not have any doctor or scientist to know the fact that blood travels in the body. Moreover, the duties of the heart, it is important. When about 600 years before Christ; Khladiut Chaokrik Dr. Galen studied and explained that the system of blood in the human body looks like a tide. Cardiac section is responsible for keeping warm blood. Best artery and vein which is not relevant at all. Therefore, how to maintain when there are higher temperatures, blood. The surgery is done by bringing the black blood out.
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