What Does It Mean That Inhibition of Calcium Channels by Norepinephrine

question 13

Multiple Choice

What does it mean that inhibition of calcium channels by norepinephrine is "voltage-dependent"?

• A) The inhibition of calcium channels by norepinephrine only occurs if the resting membrane potential is depolarized.
• B) Norepinephrine is inhibiting a voltage-gated ion channel.
• C) Norepinephrine is activating a voltage-gated ion channel.
• D) The inhibition of calcium channels by norepinephrine is enhanced by depolarization.
• E) The inhibition of calcium channels by norepinephrine is reduced by depolarization.

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