Ask an Expert: Action potential and the case of the trusty toilet
CINDY KOHTZ RN, MS

$3.95 		Nursing Made Incredibly Easy!
February 2007 
Volume 5  Number 1
Pages 63 - 64
 
  PDF Version Available!

ABSTRACT


KOHTZ, CINDY RN, MS

Assistant Professor, Methodist College of Nursing, Peoria, Ill. Q: How can I better understand the heart's electrical activity?

A: Let's start by quickly reviewing the basic components of the cardiac conduction system.

The heart is both an electrical system (cardiac conduction system) and a pump (the myocardium). For the heart to work effectively, the conduction system and the myocardium must work together. The conduction system is composed of key points in the heart called pacemaker sites. Each pacemaker site has its own inherent, or automatic, rate. The three pacemaker sites are:

[black small square]the sinoatrial node (SA node) [black small square]the atrioventricular node (AV node) [black small square]the Purkinje fibers . You're so impulsive

The SA node typically regulates heart rate and rhythm. It conducts impulses by internodal tracts to the left atrium, and both atria respond with a synchronized ...

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