The component of the conduction system that is called the pacemaker is the

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The pacemaker of the heart is the sinoatrial node, which is located in the right atrium and initiates the electrical impulses that coordinate the contraction of the heart. Choice A, conducting myofiber, is not a component of the conduction system. Choice B, atrioventricular bundle, and choice E, bundle branch, are part of the conduction system but are not specifically called the pacemaker. Choice D, atrioventricular node, delays the electrical impulse briefly to allow the ventricles to fill with blood before contracting, but it is not the pacemaker.

The Component of the Conduction System That Is Called the Pacemaker