A membrane produces an action potential whenever the potential across it reaches what level?
A) the resting potential
B) -90 mV
C) the threshold of excitation
D) the refractory period

Question

Quizplus · Accepted Answer

The threshold of excitation is the level of depolarization required to produce an action potential, typically around -55 to -40 mV. Therefore, choice C is correct. The resting potential (choice A) is the membrane potential of a neuron when it is not producing an action potential, usually around -70 mV. -90 mV (choice B) is not typically a relevant level for action potential initiation. The refractory period (choice D) is a period of time during and after an action potential when the membrane is less excitable, and another action potential cannot be produced until the membrane potential returns to its resting state.

A Membrane Produces an Action Potential Whenever the Potential Across