The refractory period is a period immediately following stimulation during which a nerve or muscle is unresponsive to further stimulation.
The change in electrical potential that occurs between the inside and outside of a nerve or muscle cell when it is stimulated, causing it to transmit an impulse.
The state of a neuron when it is at rest and capable of generating an action potential.
Hyperpolarization: An increase in the membrane potential of a cell, relative to the normal resting potential.