Now, why exactly do we call these channels voltage gated ion channels? Well, they're called this because they basically respond to changes in voltage. So when the voltage changes across our cell membrane, these voltage gated ion channels can basically open up. And when they open up, they allow the flow of our ions. So these voltage gated ion channels can open if the voltage changes. Now, let's suppose that we have our neuron, the axon hillock of the neuron, that is at the resting membrane potential.