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" "...I found the task so truly arduous... that I was almost tempted to think... that the movement of the heart was only to be comprehended by God. For I could neither rightly perceive at first when the systole and when the diastole took place by reason of the rapidity of the movement...
William Harvey (April 1 1578 – June 3 1657) was an English physician. He was the first to describe completely and in detail the systemic circulation and properties of blood being pumped to the brain and body by the heart.
Biography information from Wikiquote
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