Two Fundamental Concepts About the Ion Channels of a "Resting

Multiple Choice

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) are open or closed depending on their type, and are specific as to which ion can traverse them
D) open in response to stimuli, and then close simultaneously, in unison