Which of These Statements Correctly Describes Pacemaker Activity

question 110

Multiple Choice

Which of these statements correctly describes pacemaker activity?

• A)It refers to spontaneous depolarizations of the membrane resulting from shifts in passive ionic fluxes accompanying automatic changes in channel permeability.
• B)It refers to spontaneous depolarizations of the membrane due to cyclical changes in Na⁺-K⁺-pump activity.
• C) It is characteristic of single-unit smooth muscle but is not found in any other muscle type.
• D) It is characteristic of multiunit muscle but is not found in any other muscle type.

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