Circulation of the blood, 1628. English physician William Harvey (1578-1657) was the first to correctly describe the mechanism whereby blood is circulated in the body. Diagram showing the existence of valves in veins. From Exercitatio anatomica de motu cordis et sanguinis in animalibus, by William Harvey. (Colorised black and white print). Artist Unknown.. (Photo by The Print Collector/Getty Images)
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January 29th, 2021
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