What is the difference between action potentials of pacemaker and non-pacemaker cells?

Non-pacemaker cells In non-pacemaker cells, calcium influx prolongs the duration of the action potential and produces a characteristic plateau phase. Non-pacemaker action potentials, also called "fast response" action potentials because of their rapid depolarization, are characteristic of atrial and ventricular myocytes. Pacemaker Cells Pacemaker cells generate spontaneous action potentials that are also termed "slow response" action potentials because of their slower rate of depolarization.