After membrane depolarization in neurons, export of potassium: A) makes the value of V_m more negative. B) decreases the concentration gradient for potassium. C) is energetically favourable. D) All of the answers are correct. E) None of the answers is correct.

Question

Quizplus · Accepted Answer

After membrane depolarization in neurons, the export of potassium ions (K+) indeed makes the membrane potential more negative, a process known as repolarization. This export is energetically favorable due to the concentration gradient established by the sodium-potassium pump, which maintains higher concentrations of K+ inside the cell relative to the outside. The movement of K+ out of the cell after depolarization decreases the concentration gradient for potassium, as the inside of the cell becomes less positive relative to the outside, moving the membrane potential back towards its resting value.

After Membrane Depolarization in Neurons, Export of Potassium