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Reference.org
Pacemaker potential
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<p>In the <a href="/facts/Pacemaker_cells/j4Rn2Gfm">pacemaking cells</a> of the <a href="/facts/Heart/fF4KSGdk">heart</a> (e.g., the <a href="/facts/Sinoatrial_node/KIGaek8u">sinoatrial node</a>), the pacemaker potential (also called the pacemaker current) is the slow, positive increase in voltage across the <a href="/facts/Cardiac_myocyte/fE40oTQz">cell</a>'s membrane, that occurs between the end of one <a href="/facts/Action_potential/Sz8yCRqx">action potential</a> and the beginning of the next. It is responsible for the self-generated rhythmic firing (<a href="/facts/Cardiac_automaticity/CJu2rTR8">automaticity</a>) of pacemaker cells. </p>