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William Harvey, discoverer of blood circulation and heart function, born in 1578 in the town of Folkstone, England. A famous book An Anatomical Treatise on the Movement of the Heart and Blood in Animals (Motion automated cardiac anatomy and animal blood), published in 1628, precisely at being called an important book on the history of physiology. Indeed, the fact is the starting point for the birth of modern physiology. Its main significance lies not in immediate use but on laying a basic understanding that explains how the human body works.



For we are now being raised with the knowledge of blood circulation, will consider the theory of Harvey as something that is completely clear. But, what now seemed simple and obvious, not so much as for biologists era past. Leading writers in the field of biology has presented various opinions, including: (1) food is converted into blood in the heart, (2) heart warming the food, (3) blood vessels of the heart to the body filled the air, (4) heart makes " vital spirit "; (5) of blood, both in vessels and from the heart to flow and ebb often to the heart and often away from the heart.

Galen, great doctors in the past, people who personally examine and reflect carefully about the heart and blood vessels, had never guessed that the blood circulating. Also it escaped notice despite Aristotle him to pay attention to the biology major. Even after the publication of Harvey's book too many doctors who reluctantly accept the opinion that the blood in the human body is still rotating in the channel on a fixed system, and heart provides the power to drain the blood.

Harvey first formulate an opinion about the blood circulation by making a simple calculation arithmatik. He estimated that the amount of blood the heart rate transmitted by each about 2 ounces. Because the heart beats 72 times per minute, penjumlahannya can be concluded about 540 pounds emitted per hour of blood into the aorta. However, the amount that exceeds th

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