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These cells look just like regular heart cells. But some create rhythmical impulses and they directly control the heart rate.
The sinoatrial node (SA node) is a group of these cells positioned on the wall of the right atrium. Because the sinoatrial node is responsible for the rest of the heart's electrical activity, it is sometimes called the primary pacemaker.
Further down into the heart at a junction between the artium and ventricles is the AV node which is called the secondary pacemaker.
The last part of electrical conducting system of the heart is the Bundle of His which include left and right branches of this bundle, and the Purkinje fibers. These will also produce a spontaneous action potential at a rate of 30-40 beats per minute, if the SA and AV node both do not function.
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pacemaker
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