Which statement characterizes the absolute refractory period?
A)The neuron cannot fire again because the potassium channels are unable to open.
B)The neuron cannot fire again because the sodium channels are unable to open.
C)The neuron can fire again but only to a stronger than threshold stimulus.
D)The neuron can fire again but only at a much slower rate.

Question

Quizplus · Accepted Answer

During the absolute refractory period, the neuron cannot fire again because the sodium channels are unable to open, which prevents the initiation of an action potential. Once the sodium channels have closed and the membrane potential has returned to resting levels, the neuron enters a relative refractory period where it is possible to fire again, but only to a stronger than threshold stimulus.

Which Statement Characterizes the Absolute Refractory Period