Understanding Your Pulse Rate: How the Heart's Electrical System Works

The heart's electrical conduction system generates the pulse rate:

  • SA node (right atrium) – natural pacemaker; fires impulses causing atrial contraction.
  • AV node – delays impulses slightly, allowing atrial filling before ventricular contraction.
  • Bundle of His – conducts impulses to ventricles, causing ventricular contraction.

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