BC Biomedical NIBP-1010 Manual de usuario descargar pdf (Pagina 22)

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Fig. 2.5: Processes of action potentials in the individual parts of the heart [2.6].

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Spreadingoftheactionpotential

 Action potential is spread via the conduction system and then via the muscles in a

single direction only. One cell activates the other. The progress of the stimulus in the single

direction is caused by a temporary inability of the cell to react to irritation. This period of time

is called an absolute refractory period. The action potential can thus only pass onto a cell,

which has not been activated immediately before. The short period of time following the

absolute refractory period is called a relative refractory period. In this stage, the cell can

only be activated by a much greater supraliminal stimulus (such as a defibrillating impulse,

which, however, can trigger the fibrillation of the ventricles!) [2.3], [2.4].

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BC Biomedical NIBP-1010 Manual de usuario Pagina 22