Which of the Following Describes the Ion Channels of a Resting

question 21

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.

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