Cardiac conductile cells

• In order for the heart to function properly, all of its cells must contract in a specific sequence. This sequence is determined by a pathway known as the conduction system. • Cardiac muscle cells have two attributes that enable the conduction system to work: • Connective. Action potentials (excitatory signals) can propagate from one cell to another via gap junctions. • Autorhythmic. The cells can excite themselves spontaneously (without stimulation from the nervous system) and contract at a regular rhythm. • Cells from different parts of the heart's conduction system have different natural rhythms. • Sinoatrial (SA) node: around 100 beats/min • Atrioventricular (AV) node: 40 to 50 beats/min • Ventricles: 20 to 40 beats/min

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