Which of the following situations occurs in electrically excitable cells?

Question

Quizplus · Accepted Answer

In electrically excitable cells, such as nerve and muscle cells, depolarization can trigger the opening of voltage-gated sodium ion channels, allowing an influx of sodium ions into the cell. This results in further depolarization and the generation of an action potential. Options A and B describe the regulation of ion channels by each other or by the sodium-potassium pump, respectively, but do not specifically apply to electrically excitable cells. Option D is incorrect because sodium channels are typically not directly regulated by extracellular calcium. Option E describes the activation of ligand-gated ion channels by chemical messengers, but again does not specifically apply to electrically excitable cells.

Which of the Following Situations Occurs in Electrically Excitable Cells