Quelltext der Seite Erregungsbildungs- und Leitungssystem/en

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The system that directs the [[Erregung_(physiologisch)/en|excitation]] originating from the [[Sinusknoten/en|sinus node]] on special paths through the heart muscles and thereby achieves a [[Kontraktion/en|contraction]] of the [[Myokard/en|working myocardium]] that is as complete and efficient as possible for the pump function.

There are actually [[Muskelzellen/en|muscle cells]] that have given up the ability of [[Kontraktion/en|contraction]] in favor of [[Kardiale Erregungsleitung/en|conduction of excitation]]. If such a stimulation conducting [[Muskelzellen/en|muscle cell]] fails, the neighbouring cell can immediately take over the stimulation conducting function. 

If only nerve tracts ([[Axon/en|axon]]e) were present for the conduction of the stimulus, the heart would not be [[Erregungsbildungs-_und_Leitungssystem/en| excitable]] for a long time after its failure, which would result in immediate death. The same applies to the [[Sinusknoten/en|sinus node]], which can be newly formed in the event of a [[ektop/en|ectopic]] failure.

https://en.wikipedia.org/wiki/Cardiac_excitation-contraction_coupling