The sinoatrial (SA) node is described as the heart’s pacemak…
The sinoatrial (SA) node is described as the heart’s pacemaker, and its characteristic rhythm, called sinus rhythm, determines heart rate. From the SA node, the depolarization wave spreads via gap junctions throughout the atria, and to the ________________________, located in the inferior portion of the interatrial septum, right above the tricuspid valve.