HAVE A HEART WITH DR. OZ
'(<a href="http://www.j-archive.com/media/2009-02-24_DJ_18.jpg" target="_blank">Dr. Oz delivers the clue, again holding a squishy human heart.</a>)  The sinoatrial node on the back wall of the right atrium, <a href="http://www.j-archive.com/media/2009-02-24_DJ_18a.jpg" target="_blank">here</a>, sends out electrical signals to regulate the heartbeat & is also known as this, like a mechanical device implanted to do the same thing'
a pacemaker