Correctly identify the sequence of events at an excitatory adrenergic synapse by placing each step in numerical order.
1) Binding of neurotransmitter to the receptor on the postsynaptic membrane
2) Opening of ion channels on the postsynaptic membrane
3) Influx of ions into the postsynaptic neuron
4) Generation of an action potential in the postsynaptic neuron
5) Termination of the signal by reuptake or enzymatic degradation of the neurotransmitter
