A physical or chemical stimulus can produce a change in a cell's membrane potential by changing the A) Na⁺ concentration outside the cell. B) use of ATP by the sodium-potassium pump. C) permeability of the cell membrane. D) time needed for K⁺ ions to reach equilibrium. E) extracellular environment.

Question

Quizplus · Accepted Answer

A change in a cell's membrane potential is caused by a change in the flow of ions across the membrane. The permeability of the cell membrane determines the ease with which ions can cross the membrane, and therefore plays a key role in producing changes in membrane potential.

A Physical or Chemical Stimulus Can Produce a Change in a Cell's