William Harvey: How the Circulation of Blood Was Discovered
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William Harvey: How the Circulation of Blood Was Discovered

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William Harvey once dissected a toad during a witchcraft investigation to prove it was an ordinary animal. This episode explores how he applied that same reliance on observation and math to overturn 1,400 years of Galenic medicine, which held that the liver made blood and the heart was a furnace for vital spirits.

We follow his training at Padua under Fabricius, his rules for public dissection, his work as royal physician with access to the king's deer, and the experiments behind De Motu Cordis in 1628. We also cover the backlash he faced, the loss of his manuscripts during the English Civil War, his eccentric later years, and his conclusion that all life comes from an egg.

  • Galen's model of the body and why earlier challengers like Servetus were suppressed
  • How slowing the heart through cold-blooded and dying animals revealed it as a pump
  • The calculation showing the liver would need to make hundreds of pounds of blood a day
  • The arm ligature experiment that proved veins carry blood back to the heart through one-way valves
  • His lost manuscripts, ex ovo omnia, and the coffee meetings he endowed at the Royal College of Physicians

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