Once the threshold potential is reached,

Question

Quizplus · Accepted Answer

The threshold potential is the minimum membrane potential that must be reached in order for an action potential to be generated. Once this threshold is reached, voltage-gated Na+ channels open and cause a rapid influx of Na+ ions, leading to depolarization and the generation of an action potential. Therefore, the correct answer is B, an action potential is inevitable. Choices A, C, and D are all incorrect because they do not accurately describe the events that occur once the threshold potential is reached.

Once the Threshold Potential Is Reached