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  • Miguel Gatsi posted an update in the group Group logo of MT 30 - IJ (LEC)MT 30 – IJ (LEC) 3 years, 11 months ago

    William Harvey and the discovery of the circulation of the blood

    Harvey’s discovery of the circulation had its origins in his early medical studies at the University of Padua, when he was a student of the renowned anatomist Fabricius, who was particularly interested in vein valves. Harvey’s adherence to the new notion of “scientific method” distinguished him from his tutor. His conclusions were also influenced by Erasistratus and Galen’s previous work. Harvey reported his results on blood circulation in his classic work De Motu Cordis in 1628, following a long period of investigation. It is worth noting that Harvey, as a clinical practitioner, did not immediately apply his insights to his profession as a physician.


    • Harvey spent a lot of time studying the mechanics of blood flow in the human body. Most doctors at the time believed that the lungs were in charge of transporting blood throughout the body. Harvey’s renowned “Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus,” also known as “de Motu Cordis,” was first published in Latin in Frankfurt in 1628, when he was 50 years old. The first English translation did not exist for another two decades.
        • Harvey observed the heart in living animals and discovered that systole was the active phase of the heart’s activity, pumping out blood via muscle contraction. After determining that the amount of blood ejected from the heart at any given time was too great to be absorbed by the tissues, he was able to demonstrate that the valves in the veins allow blood to flow only in the direction of the heart and that the blood circulated around the body and returned to the heart. Fabricius, his Padua master, had discovered the vein valves.
            • Harvey summarized his findings in Chapter 13: “It has been shown by reason and experiment that blood by the beat of the ventricles flows through the lungs and heart and is pumped to the whole body. There it passes through pores in the flesh into the veins through which it returns from the periphery everywhere to the centre, from the smaller veins into the larger ones, finally coming to the vena cava and right atrium.”It must therefore be concluded that the blood in the animal body moves around in a circle continuously and that the action or function of the heart is to accomplish this by pumping. This is only reason for the motion and beat of the heart.

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