Primary Pacemaker Cells

Primary pacemaker cells located in the central region of the sinus node (SA node) undergo spontaneous diastolic depolarization, which ultimately induces an action potential (AP) elevation. The excitatory AP wavefront then spreads through the vicinity of the surrounding area to the sputum terminal and the atrium. Repolarization of pacemaker cells allows for repeated cycles. This unique periodic behavior allows the SA node to function as a normal pacemaker for the heart (7; 12; 14; 26; 57).

The pacemaker cell is located in the sinus node (SA). This nodule is on the wall of the right atrium. These pacemaker cells cause spontaneous depolarization, produce action potentials, and determine heart rate under normal physical conditions. Pacemaker cells are also found in atrioventricular (AV) nodules located in the ventricular wall. Normally, SA nodes are often referred to as pacemakers because they generate electrical pulses of the heart, but if the SA node does not work or its path is blocked, it becomes the heartbeat generated by the AV node . Cardiac pacemaker

Within the cardiovascular system there are electrical events that cause contraction and relaxation of the muscles of the heart. From an electrical activity point of view, myocardial cells can be classified as pacing-less cells or pacemaker cells. Pacemaker cells generate impulses and can control heart rate. The pacemaker cell is located in the sinus node (SA). This nodule is on the wall of the right atrium. These pacemaker cells cause spontaneous depolarization, produce action potentials, and determine heart rate under normal physical conditions. Pacemaker cells are also found in atrioventricular (AV) nodules on the ventricular wall.

Myocardium has two kinds of cells. Muscle cells that are easy to contract and conduction pacemaker cells. Muscle cells constitute the majority (99%) of the cells of the atria and ventricles. These contractile cells are connected by an inserted intervertebral disc, which allows a rapid response to action potential pulses of the pacemaker cells. The inserted disc allows the cells to act as a syncytium and can pass blood through the heart and during contraction of the main artery. Pacemaker cells occupy 1% of the cells and form a cardiac conduction system. They are usually much smaller than contracted cells, and contractility is limited because there are few myofibrils. These functions are similar to neurons in many respects.