They literally guessed or juts didn’t know. Autopsies used to be considered disrespectful, so we juts guessed based on animals. Which you can guess how that worked out. They used to think emotion was the job of the heart. And even in modern medicine, for the longest time, people thought the heart would juts stop of you touched it. I also remember hearing something about the origin of blood, but I can’t remember.
But in short, they didn’t.
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