The fact that blood circulates in our body might seem obvious to us in this age of advanced medical technology, but that was not always the case. Early knowledge of this subject came from the studies of Galen, the Greek physician. Unfortunately, most of his conclusions were later proven wrong.
It was William Harvey who discovered and published the first accurate description of the human circulatory system in 1616. Before Harvey’s discovery, it was thought that blood was made in the liver which later turned into flesh. Though this might seem stupid to us, it was widely accepted by the doctors back then.
Harvey accepted only those ideas which had scientific evidence. He finally published his research findings in Exercitatio Anatomica de Motu Cordis Sanguinis in Animalibus (An Anatomical Exercise on the Motion of the Heart and Blood in Living Beings) in 1628. He proved that blood circulates within the body and that the circulatory system includes arteries, veins and the heart.
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