who discovered systemic blood circulation system in human body
William Harvey William Harvey (1 April 1578 â€“ 3 June 1657)[2] was an English physician who made seminal contributions in anatomy and physiology. He was the first known physician to describe completely and in detail the systemic circulation and properties of blood being pumped to the brain and body by the heart, though earlier writers, such as Realdo Colombo, Michael Servetus, and Jacques Dubois, had provided precursors of the theory.[3][4] In 1973 the William Harvey Hospital was constructed in the town of Ashford, a few miles from his birthplace of Folkestone.
ABO blood group system The ABO blood types were discovered by Karl Landsteiner in 1901, for which he received the Nobel Prize in Physiology or Medicine in 1930. ABO blood types are also present in some other animals such as rodents and apes, including chimpanzees, bonobos, and gorillas.[4]