The relative refractory period of an axon coincides with the period of
A)activation and inactivation of voltage-dependent Na⁺ channels.
B)Na⁺ permeability that is greater than that during the depolarization phase.
C)increased K⁺ flux into the cell.
D)increased K⁺ permeability of the cell.
E)Increased Na⁺ flux through K⁺ channels.

Question

Quizplus · Accepted Answer

The relative refractory period of an axon is a phase during which a neuron can be excited to fire an action potential, but only by a stronger stimulus than usual. This period coincides with the time when potassium channels are open, leading to increased potassium permeability of the cell. This allows potassium ions to leave the cell, helping to restore the resting membrane potential after an action potential has occurred.

The Relative Refractory Period of an Axon Coincides with the Period