William Harvey (1578-1657) performed the greatest ... was made in the liver and flows through the body’s blue-coloured veins. A second red fluid moves through the heart and arteries, activating ...

Basic Books, June 2022 A foundational discovery that helped Harvey build the model of blood circulation was the new demonstration by his teacher Hieronymus Fabricius of anatomical valves in the veins.

by William Harvey 1628. The diagram demonstrates the existence of one-way valves in veins. Before the Renaissance, many people (influenced by Galen) believed that new blood was produced in the ...

And like those ideas, its development was largely a solitary effort, conceived, begun, and completed by a single individual, the English physician William Harvey. He published his discovery in ...