Which specialized group of cells acts as the primary natural pacemaker of the human heart?
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The sinoatrial (SA) node, located in the upper wall of the right atrium, generates electrical impulses that set the rhythm of your heartbeat. While the atrioventricular (AV) node also handles electrical signals, its main job is to slightly delay the impulse so the ventricles have time to fill with blood. Photo: J. Heuser, Wikimedia Commons, CC BY 2.5.
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Source: Wikipedia (CC BY-SA)
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