Differences between nodal cells and atrioventricular myocytes.

Why is an AV node cell action potential slower than an atrial or ventricular myocyte?

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...troke and greater amplitude of the action potential. This is due to the rapid influx of sodium ions through fast sodium channels. The rapid influx allows a more rapid change in membrane potentials of adjacent cells and therefore a more rapid propagation and spread of potential to a greater distance. AV nodal cells have an upstroke that is achieved by the relatively slow influx of calcium ions and an action potential ...