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Pacemaker potential
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==Pacemakers== [[File:Pacemaker rates.svg|thumb|Pacemaker rates]] The heart has several pacemakers, each which fires at its own intrinsic rate: * ''SA node:'' 60β100 bpm * ''Atrioventricular node(AVN):'' 40β60 bpm * ''Purkinje fibres:'' 20β40 bpm The potentials will normally travel in order<br/> SA node β Atrioventricular node β Purkinje fibres Normally, all the foci will end up firing at the SA node rate, not their intrinsic rate in a phenomenon known as overdrive-suppression. Thus, in the normal, healthy heart, only the SA node intrinsic rate is observable.
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