Pacemaker activity

Question

Pacemaker activity

Quizplus · Accepted Answer

Pacemaker activity refers to spontaneous depolarizations of the membrane resulting from shifts in passive ionic fluxes accompanying automatic changes in channel permeability. It is often found in cells that have the ability to spontaneously generate action potentials, such as cardiac pacemaker cells and some smooth muscle cells. Choice (b) is incorrect because there is no such thing as Na⁺-K⁺ pump activity in cells. Choice (c) is partially incorrect because while pacemaker activity is characteristic of single-unit smooth muscle, it is also found in other muscle types, such as cardiac muscle. Choice (d) is incorrect because choice (c) is only partially correct. Choice (e) is also incorrect because choice (b) is incorrect.

Pacemaker Activity