What Happens When an Action Potential Arrives at an Axon

Multiple Choice

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

A) ​Membrane voltages stimulate the axon.
B) ​The action potential starts a chain reaction.
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.