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William Harvey published a book called "An Anatomical Study of the Motion of the Heart and of the Blood in Animals'. A mouth-full I know but this book illustrated how the heart pumps the blood in humans and animals, also how the heart works.
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Sir Humphry Davy discovered the anesthetic properties of Nitrous Oxide. This, of course, made performing surgery and tooth removal a lot more comfortable than without.
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This man has created the stethoscope. This led to doctors being able to diagnos heart palpatations and other heart issues.
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He was the first physician to successfully perform a blood transfusion on a human.
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Charles had created the first computer. This led to other mechanical medical equipment.
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Mr. Hoffman had developed asprin.
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Karl developed the ABO blood typing system that helped people classify blood types and improved surgery successful rate.
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Mellanby discovered that a vitamin D defficiency causes rickets.
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Shortly after world war 1 Alexander created penicillin. This of course led to more antibiotics that followed.
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Zoll was the man that developed the first ever cardiac pacemaker.
