Which of these statements correctly describes pacemaker activity?

Question

Quizplus · Accepted Answer

Pacemaker activity refers to the ability of certain cells, such as those in the sinoatrial node of the heart, to spontaneously depolarize and generate electrical impulses that can trigger contractions in surrounding muscle cells. This depolarization is due to shifts in passive ionic fluxes accompanying automatic changes in channel permeability, rather than cyclical changes in ion pump activity as described in option B. Pacemaker activity is not limited to any specific muscle type, and can be found in both single-unit and multiunit muscle. However, it is most commonly associated with the heart, which is a multiunit muscle.

Which of These Statements Correctly Describes Pacemaker Activity