Which of the Following Describes the Ion Channels of a Resting

Multiple Choice

Which of the following describes the ion channels of a resting neuron?

A) The channels are always open, but the concentration gradients of ions frequently change.
B) The channels are always closed, but ions move closer to the channels during excitation.
C) The channels are open or closed depending on their type, and are specific as to which ion can traverse them.
D) The channels are open in response to stimuli, and then they close simultaneously.