Voltage gated Na+ channels recover at different rates and an action potential can be triggered by a strong stimulus

More voltage gated Na+ channels open and there is a lower threshold for action potentials

Voltage gated Na+ channels being to recover at different rates but not the voltage-gated K+ channels

Voltage gated K+ channels begin to recover at different rates and an action potential can be triggered by a strong stimulus

All Na+ channels are closed and no action potentials can be generated