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What is responsible for the rhythmic beating of the heart?

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What is responsible for the rhythmic beating of the heart?

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  1. I think it has something to do with the closing of the valves. But i'm not sure


  2. The inherent electrical activity with the "time-keeper" called the Sino-atrial (SA) node which is located in the right atrium.

    The complexity of the electrocardiac physio. is beyond the scope of a simple discussion.

  3. it has to do with the pacemaker and the way it makes the valves open and close. one beat is to let blood in, and the second is to push the blood out.

  4. SA  node
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