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→What changes the frequency of the heart?
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* the (para) sympathic nerve system. | * the (para) sympathic nerve system. | ||
** The '''sympathic system''' e.g. epinephrin (=adrenalin) increases the atrioventricular conduction and contractility. (the ''fight, fright, flight'' reaction) | ** The '''sympathic system''' e.g. epinephrin (=adrenalin) increases the atrioventricular conduction and contractility. (the ''fight, fright, flight'' reaction) | ||
** | ** The parasympathic system (nervus vagus) e.g. acetycholin decreases the frequency and atrioventricular conduction. The parasympathic system effects mainly the atria. | ||
* Cardiac filling increases the frequency. | * Cardiac filling increases the frequency. | ||