What Happens When the Membrane Potential of a Neuron Reaches

question 20

Multiple Choice

What happens when the membrane potential of a neuron reaches the threshold level?

• A) Voltage-gated sodium channels open, and sodium diffuses out of the cell.
• B) Voltage-gated potassium channels open for a very brief period.
• C) Voltage-gated sodium channels close, so sodium cannot diffuse out of the cell.
• D) The sodium channel protein changes its shape to open the gates of the channel.
• E) The membrane potential is more negative than when at rest.

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