What do pacemaker cell action potentials lack?

Name: What do pacemaker cell action potentials lack?
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Pacemaker cells, unlike typical cardiac muscle cells, lack a plateau phase in their action potential. The plateau phase, characterized by a sustained depolarization mainly due to calcium ion influx in other cardiac cells, is absent in pacemaker cells, which instead have a spontaneous depolarization during diastole leading to the generation of action potentials.

What Do Pacemaker Cell Action Potentials Lack