“For most of history, humans had no idea what purpose the heart served… although everyone could feel their own heart beating, it wasn’t always clear what each thump was achieving… Even in the 21st century, only a few people in surgery teams have actually seen a working heart.”

How the heart actually pumps blood, a TED Ed by Edmond Hui, with animation by Anton Bogaty.

In the archives, related watching: The Bloodmobile, Why Red Blood Cells Look Like Donuts, and The Circulatory System.

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