The cardiac conduction system allows the synchronized propagation of electrical activity through heart muscle. This is initiated by the spontaneous activity of the specialized pacemaker cells of the sino-atrial node (SAN). The SAN region underlies automaticity in mammals and therefore has a crucial role in the pathogenesis of cardiac disorders such as arrhythmia. https://www.duospiritalis.com/limited-deal-Radio-Birdman-Rock-Roll-Soldiers-T-Shirt-super-grab/