The normal pacemaker of the heart is

The normal pacemaker of the heart is the sinoatrial (SA) node, located in the outer membrane of the right atrium at the junction of the superior vena cava and the right atrium. Acting as the "conductor" of the heart's electrical activity, the SA node can automatically and rhythmically generate electrical impulses. These signals rapidly spread through the heart's conduction system to both the atria and ventricles, triggering excitation and contraction of cardiac muscle cells, thereby driving blood circulation. The SA node has a stable and relatively fast pacing rate, ensuring that the heart continuously and effectively pumps blood to meet the demands of all tissues and organs throughout the body.

Therefore, normal function of the SA node plays an important role in maintaining vital bodily activities. If it becomes diseased or suppressed, serious consequences such as arrhythmias or heart failure may result. Any physical discomfort should prompt timely medical consultation.