What term is used to define the ability of certain cardiac cells to depolarize without stimulation?

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Automaticity is the term used to describe the ability of certain cardiac cells to depolarize without stimulation, allowing them to serve as pacemaker cells in the heart. Polarization refers to the difference in electrical charge between the inside and outside of a cell membrane, contraction refers to the mechanical tightening of muscle fibers, and repolarization refers to the restoration of a cell's resting membrane potential after depolarization.

What Term Is Used to Define the Ability of Certain