Consisting of the heart, blood vessels and blood, the system through which blood moves throughout the body is called the circulatory system. The Greek physician Gallon (130-210) and later scientists for more than 1,400 years believed that the heart produced blood and pumped it throughout the body. In 1628, British physician William Harvey was the first to present the correct method of blood circulation in the human body. For this reason, he is called the father of the circulatory system. De Viussens (1706) described the chambers and tubules of the heart. Stephen Hales first measured blood pressure in 1733. Wren Linnec (1816) invented the stethoscope. In 1952, John Lewis performed the first open heart surgery. Christian Barnard (1967) established the heart in the human body. In 1982, Robert Jarvik created the artificial heart and Willem de Vries implanted it in the human body.