Answer
In the afterpolarizatio (hyperpolarization phase), voltage-gated K+ channels are still open, but Na+ ion channel gates are resting. This is a relative refractory phase in which a stimulus of normal size applied to a medium sized axon will not generate an action potential (AP).
Work Step by Step
In the relative refractory period, large neurons, if powerfully stimulated by a very strong stimulus, may respond by generating an action potential.
