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  1. The SA node (sinoatrial). This group of cells is located in the right atrium and sets the pace for the heart, increasing and decreasing when it is needed.

    6 Answers · Science & Mathematics · 08/03/2009

  2. The P-wave, the QRS complex, and the T-wave http://www.merck.com/media/mmhe2/figures/MMHE_03_021_01_eps.gif The P wave represents the wave of depolarization that spreads from the SA node throughout the...

    2 Answers · Science & Mathematics · 06/03/2009

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