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Dear Dr. Brown, I am writing to you today to tell you about the theories of Galen and William Harvey and how they differed.

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Claudius Galen and William Harvey 24th February 2003 Dear Dr. Brown I am writing to you today to tell you about the theories of Galen and William Harvey and how they differed. Prior to Harvey's experiments, a man by the name of Claudius Galen had many theories on the topic of blood and circulation. Generally, Galen's theories were accepted by society. Galen believed that in the body there were two sources of blood, the liver and the heart. The liver is the sender of venous blood which was believed to carry nutrients. The heart on the other hand was the origin of the arterial blood which supposedly carried the spirit. ...read more.


Galen's medical writings became the standard source of medical knowledge for centuries. His experimental work was revolutionary: he demonstrated the function of the nervous system by cutting animals' spinal cords and different points and observing their resulting paralysis. He was the first to consider the diagnostic value of taking a subject's pulse, and was the first to identify several muscles. However, as time went on William Harvey performed experiments to test Galen's theories and found they were not quite correct. In 1615, Harvey began to work on the circulation of blood. Through these experiments Harvey demonstrated that all venous blood moves from the periphery of the body to a single centre, the heart. ...read more.


In fact, Harvey developed the first complete theory of blood. The main finding which he is credited for is the function of the heart, the major organ involved in circulation. Harvey demonstrated that the heart functioned as a mechanical pump to move the blood throughout the body by contracting to push the blood out and as it relaxes blood renters the organ. Therefore, without the heart, circulation of the blood would not be possible. So you can see Dr. Brown, William Harvey was one of the seventeenth century's greatest scientists and contributors, played a key role in the progress in the field of science. His ideas and experiments lead to the basic knowledge of the circulatory system. It was several years before Harvey was recognized for his work and his theories were accepted, but nonetheless his discoveries are highly valued today. Yours sincerely, Kamal Patel ...read more.

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