Once a threshold is reached,
A)the number of sodium gates that open depends upon the strength of a stimulus and its duration.
B)a graded local potential will be unable to spread to a trigger zone of the nerve membrane.
C)the resting potential of a neuron is restored.
D)potassium channels in the input zone open.
E)progressive opening of more and more sodium gates and the accompanying flow of sodium ions is an example of positive feedback.

Question

Quizplus · Accepted Answer

Once a threshold is reached, there is a rapid and progressive opening of more and more sodium gates, which results in the influx of more sodium ions into the neuron. This self-amplifying process is an example of positive feedback. This event results in the generation of an action potential.

Once a Threshold Is Reached