Heart 101 | National Geographic
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Heart 101 | National Geographic
The human heart beats up to 3 billion times over an average lifespan. Learn about the anatomy of the heart and how this muscular organ provides life-giving oxygen throughout the body. Subscribe: https://on.natgeo.com/4p5A0D6 #NationalGeographic #Hearts #Educational About National Geographic: National Geographic is the world's premium ...
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