William Harvey (1578-1657), English physician, dissecting an animal during a lecture on the circulation of blood. By 1616 Harvey had dissected 80 spec
William Harvey (1578-1657), English physician, dissecting an animal during a lecture on the circulation of blood. By 1616 Harvey had dissected 80 species of animals, concentrating on the blood vessels. He noted that the valves joining the heart's two upper and lower chambers permitted blood flow in one direction only. He showed that the heart was a muscle which acted like a pump. He concluded that arteries and veins were linked by invisibly-small vessels so that blood moved around the body in a closed loop. He lectured on the subject from 1616 at the Royal College of Physicians in London. His ideas were widely accepted by the time of his death.
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