So let's begin by discussing a special type of protein found in the membrane of our neuron. And this protein is known as the voltagegated ion channel. Now, there are two types of voltagegated ion channels, and they differ in the type of ion that they allow to pass through. So we have voltage gated sodium channels, which allow the passage of sodium ions. And we have voltage gated potassium channels that allow the passage of potassium ions when these voltage gated channels are open. Now, when our cell is at the resting membrane potential, which is around negative 70 millivolts, our channels, the voltage gated ion channels, are closed.