Is pacemaker cell and node cell the same?

Pacemaker cells and node cells are not exactly the same, but they are closely related. Pacemaker cells are specialized cardiac muscle cells responsible for initiating and regulating the heartbeat, primarily found in the sinoatrial (SA) node, which is the heart's primary pacemaker. The term "node cells" typically refers to the cells within the SA node and the atrioventricular (AV) node, both of which play critical roles in the conduction system of the heart. Thus, while all pacemaker cells are node cells, not all node cells are pacemaker cells.