Two Fundamental Concepts About the Ion Channels of a "Resting

question 38

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) 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.

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