During the absolute refractory period, a new action potential cannot be elicited. During the relative refractory period, a new action potential can be elicited under the correct circumstances. The cardiac refractory period can result in different forms of re-entry, which are a cause of tachycardia.
What is the significance of the absolute refractory period of a neuron?
The period when our neuron can’t fire an action potential is called the absolute refractory period. At this time, no matter what goes on, the neuron just can’t fire an action potential. The reason for this lies in the voltage-gated sodium channels.
What occurs in neurons during the refractory period following an action potential?
In its wake, the action potential leaves the Na+ channels inactivated and K+ channels activated for a brief time. These transitory changes make it harder for the axon to produce subsequent action potentials during this interval, which is called the refractory period.