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.
Christiaan Barnard Christiaan Neethling Barnard (8 November 1922 – 2 September 2001) was a South African cardiac surgeon who performed the world's first human-to-human heart transplant on 3 December 1967 at Groote Schuur Hospital in Cape Town, South Africa.[1][2] Growing up in Beaufort West, Cape Province, he studied medicine and practised for several years in his native country.[3] As a young doctor experimenting on dogs, Barnard developed a remedy for the infant defect of intestinal atresia. His technique saved the lives of ten babies in Cape Town and was adopted by surgeons in Britain and the United States.[4] In 1955, he travelled to the United States and was initially assigned further gastrointestinal work by Owen Harding Wangensteen.[5] He was introduced to the heart-lung machine, and Barnard was allowed to transfer to the service run by open heart surgery pioneer Walt Lillehei.[6] Upon returning to South Africa in 1958, Barnard was appointed head of the Department of Experimental Surgery at the Groote Schuur Hospital, Cape Town.[7]