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MEMBRANE POTENTIAL Test Questions Flashcards | Quizlet D)When the permeability to sodium ions increases, the sodium ions diffuse into the cell and the inside of the cell becomes more negative, resulting in hyperpolarization. A) Graded potentials A)spread over the plasma membrane in decremental fashion. B)are not propagated for long distances. C)are confined to a small region of the plasma membrane. The Membrane at Rest - Foundations of Neuroscience The permeability of chloride is about half of that of potassium, and the permeability of sodium is about 25 to 40 times less than that of potassium. This leads to enough chloride and sodium ion movement to keep the neuron at a resting membrane potential that is slightly more positive than potassium's equilibrium potential. 00:00 00:05 Membrane potential: Definition, equilibrium, ions | Kenhub Cell membrane permeability The third factor that affects the membrane potential is the permeability of the membrane for the sodium and ...