Cardiac conductile cells

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• 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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