(1) ca2+ enters axon terminal. (2) ligand-gated ion channels open in postsynaptic membrane. (3) neurotransmitter binds to postsynaptic receptor. (4) action potential reaches axon terminal of presynaptic neuron. (5) neurotransmitter released by exocytosis.

These are the events occurring at synapse for the transmission of nerve impulse across the synapse from one neuron to another. The order of events is as follows: 4 - 1 - 5 - 3 - 2.

Explanation:

The correct order of events during the transmission of nerve impulse from one neuron to another is as follows:

4) Action potential reaches axon terminal of presynaptic neuron.

1)  Ca2+ enters axon terminal.

5) Neurotransmitter released by exocytosis.

3) Neurotransmitter binds to postsynaptic receptor.

2) Ligand-gated ion channels open in postsynaptic membrane.

- The transmission across the synapse can be either electrical or chemical. Here is this case we are talking about chemical transmission.

- When the action potential reaches the axon terminal, the voltage gated calcium channels open and there is influx of calcium from the synapse.

- This causes the fusion of synaptic vesicles with the membrane and exocytosis of neurotransmitter.

- These neurotransmitters bind to the receptors on post synaptic membrane and cause opening or closing of voltage gated channels.

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