Answer:
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.
