Abstract

William Harvey (1578-1656) presented his conceptions on blood circulation in Exercitatio anatomica de motu cordis e sanguinis em animalibus (Anatomical study on the heart and blood movement in animals) in 1628. His most relevant work was the treatise De motu cordis, as it is better known, which resulted from more than nine years of observations and anatomical demonstrations in animals and humans. It greatly impacted the period's physicians, philosophers, and anatomists, generating several comments and criticisms. Harvey's ideas concerning blood circulation implied a break with the accepted knowledge of the time, based mainly on the conceptions of Claudio Galeno (129 AD- 216 AD). This article aims to present Harvey's ideas on the subject and discuss to what extent they represent a break with the ideas of his predecessors. This research corroborates the view defended by more recent historiography that knowledge about blood circulation has been constructed since Antiquity, although Harvey's work is prominent.