Which set of steps BEST accounts for the role of the axon hillock in nerve cell activity?

Question

Quizplus · Accepted Answer

The axon hillock is the site where summation of different inputs on a neuron occurs. If the summation reaches a certain level, known as threshold, depolarization occurs and an action potential is generated, which travels down the axon from the axon hillock to the synaptic terminals. Therefore, the correct sequence of steps is depolarization, summation, threshold, and action potential, as described in option A. The option B is incorrect because the refractory period occurs after the action potential, not before. The option C is incorrect because action potential occurs before the refractory period, and summation occurs earlier than threshold. The option D is incorrect because summation occurs before refractory period, and threshold occurs before action potential.

Which Set of Steps BEST Accounts for the Role of the Axon