Immediately after an action potential has peaked, potassium cellular gates open.
When the action potential is about to peak, the potassium channel opens and the sodium channel closes, allowing potassium ions to exit the cell and return to the membrane's resting potential. The increase in the permeability to Na⁺ induced by a stimulation lasts for a very brief time. It is swiftly followed by an increase in K⁺ permeability. K⁺ diffuses outside the membrane in a split second, restoring the membrane's resting potential at the site of excitation and making the fiber once again sensitive to additional stimulation. Sodium gates open when the potential starts, allowing sodium ions to pass across the membrane.
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