How the heart actually pumps blood

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+4 1. boksaman commented 10 years ago

just explain it already ! damn...
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+11 2. ughlah commented 10 years ago

and thats a better explanation?
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0 3. firest4rter commented 10 years ago

Didn't we learn this in school?
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+4 4. SquidCap commented 10 years ago

Typical Ted-ED video. These really are rubbish, each one. I tried to watch these when they started publishing them and they just are all like this.