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Bloodletting is one of the oldest medical practices and thought to have originated in ancient Egypt.
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The ancient Greeks viewed the cardiovascular system as being comprised of arteries and veins
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Anton van Leeuwenhoek was the first to see blood cells under a microscope.
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Dr. James Blundell performed the first blood transfusion to try to treat hemorrhage.
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In 1901, Karl Landsteiner found out that the blood of two people under contact agglutinates and found that this effect was due to contact of blood with blood serum, as a result, he succeeded in identifying the three blood groups.
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In 1902, two of Dr. Landsteiner's colleagues, Alfred von Decastello and Adriano Sturli, discovered the fourth blood group: AB
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In October 1921, as the Honorary Secretary of the Camberwell branch of the Red Cross, Percy Oliver got a call from the nearby King's College Hospital in urgent need of a blood donor. He went to the hospital and saw Sister Linstead, a Red Cross worker, and became the first voluntary blood donor.
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