What Did Galen of Pergamon Discover About Human Anatomy, the Nervous System, and the Circulatory System?
Galen was particularly interested in blood and its flow throughout the body. He proved that the arteries contained blood, not an air-like substance called “pneuma,” as had been believed. His theory was that blood was produced from food intake and that nutrition was supplied to the body from blood flowing in the veins and arterie
