What Happens When an Action Potential Arrives at an Axon

question 30

Multiple Choice

What happens when an action potential arrives at an axon terminal?  

• A) Membrane voltages stimulate the axon.
• B) Sodium ions are pumped out of the cell.
• C) A neurotransmitter builds up so it can be used again.
• D) The action potential causes an influx of phosphorous ions.
• E) Chemicals relay the message at a synapse.

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