Heart Conduction System (Cardiac Conduction) and #education ECG (Electrocardiogram): Heart conduction is the heart's built-in electrical system, starting at the sinoatrial (SA) node (the natural pacemaker) which generates impulses that spread through the atria, causing them to contract, then pause at the atrioventricular (AV) node, and finally travel down the bundle of His, bundle branches, and Purkinje fibers to the ventricles, causing them to contract for a coordinated heartbeat, ensuring effi