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The transmission of a nerve impulse across a chemical synapse involves the release of neurotransmitters. What is the correct sequence of events?
- A.Action potential reaches axon terminal, calcium influx, vesicle fusion, neurotransmitter release
- B.Neurotransmitter release, calcium influx, action potential generation, vesicle fusion
- C.Vesicle fusion, action potential generation, calcium influx, neurotransmitter release
- D.Calcium influx, action potential generation, vesicle fusion, neurotransmitter release
Show correct answer & step-by-step solution
Correct answer: A — Action potential reaches axon terminal, calcium influx, vesicle fusion, neurotransmitter release
Solution
- An action potential arrives at the presynaptic terminal.
- Voltage-gated channels open, allowing influx.
- Increased causes synaptic vesicles to fuse with the membrane.
- Neurotransmitters are released into the synaptic cleft.
- Hence the answer is (A).
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