An action potential on a neuron develops when
A)threshold voltage is reached on an axon
B)voltage-gated Na+ channels open
C)spatial or temporal summation of graded potentials occurs to a great enough degree
D)the axon hillock reaches threshold voltage
E)any of the above events occur

Question

Quizplus · Accepted Answer

All of the listed events contribute to the development of an action potential on a neuron. Spatial or temporal summation of graded potentials can bring the membrane potential of the axon hillock closer to threshold voltage, voltage-gated Na+ channels open in response to depolarization, and when threshold voltage is reached on the axon, an action potential is initiated.

An Action Potential on a Neuron Develops When