Two Fundamental Concepts About the Ion Channels of a "Resting

Question

Two fundamental concepts about the ion channels of a "resting" neuron are that the channels
A) are always open, but the concentration gradients of ions frequently change.
B) are always closed, but ions move closer to the channels during excitation.
C) open and close depending on stimuli, and are specific as to which ion can traverse them.
D) open and close depending on chemical messengers, and are nonspecific as to which ion can traverse them.
E) open in response to stimuli, and then close simultaneously, in unison.

Accepted Answer

Ion channels in resting neurons are specific in terms of which ion can traverse them and open and close depending on stimuli. This is what allows the neuron to maintain its resting membrane potential. Options A, B, D, and E are incorrect as they do not accurately describe the behavior of ion channels in resting neurons.