How does the conductive system stimulate the cardiac muscle?

The cell membranes of the Purkinje cells are in contact with the memranes of cardiac muscle cells. Depolarization of the Purkinje cell membrane causes the membrane of the muscle cell to exceed its own threshold value for opening up the fast sodium channels to completely depolarize the myocyte membrane. read more

The conduction system consists of specialised heart muscle cells, and is situated within the myocardium. There is a skeleton of fibrous tissue that surrounds the conduction system which can be seen on an ECG. Dysfunction of the conduction system can cause irregular, fast, or slow heart [cardiac] rhythms. read more

The conducting system of the heart consists of cardiac muscle cells and conducting fibers (not nervous tissue) that are specialized for initiating impulses and conducting them rapidly through the heart (see the image below). They initiate the normal cardiac cycle and coordinate the contractions of cardiac chambers. read more