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Could the human heart have been more effecient ?

petrushka.googol
in Evolution, Morphology and Exobiology

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Humans (and other mammals) have a four-chambered heart that beats more than 2 billion times during the average lifespan.

 

Could this organ have been more efficient ?

 

And what if we had a 3 chambered heart ?

 

Please advise. :wacko:

As an open-ended problem? Yeah, there's probably some way it could be more efficient.

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