the following steps refer to various stages in transmission at achemical synapse. Which sequence of events in correct?

1. Neurotransmitter binds with receptors associated with thepostsynaptic membrane.
2. Calcium ions rush into neuron’s cytoplasm.
3. An action potential depolarizes the membrane of the axonterminal
4. Activated receptors cause the opening of the ion channels.
5. The synaptic vesicles release neurotransmitter in to thesynaptic cleft

1. 1-2-3-4-5
2. 1-3-5-4-2
3. 3-2-5-1-4
4. 3-4-1-2-5