The cell then becomes permeable to potassium. This is a hyperpolarization , and the length of time during which the membrane is hyperpolarized is called the refractory period . This causes a conformational change in the membrane protein, allowing the gates to open. The neuron carries information in the form of action potentials. Voltage gated channels are concentrated in areas of the axon where the current starts to die down.
Action potential is regenerated and kept uniform in size.