Which of the following is the correct sequence of events that occur during synaptic transmission?

Question

BlackTom AI · Accepted Answer

To address the question, we first recall the canonical sequence of events in synaptic transmission during an action potential.
Option a starts with the postsynaptic cell responding before the presynaptic events occur, which cannot be correct because the postsynaptic response depends on neurotransmitter release following an action potential.
Option b suggests that the action potential arrives at the axon terminal, then neurotransmitter binds to receptors before release. In reality, neurotransmitter binding to receptors on the postsynaptic side cannot occur until the neurotransmitter is released into the synaptic cleft from the presynaptic terminal.
Option c presents the sequence: Action potential arrives at axon terminal, neurotransmitter is released into the synaptic cleft, neurotransmitter binds to receptor, and the postsynaptic cell responds. This aligns with the standard model: depolarization of the presynaptic bouton triggers voltage-gated calcium channels to open, triggering vesicle fusion and neurotransmitter release; the neurotransmitter then binds to receptors on the postsynaptic membrane, initiating a response.
Option d reverses the order by implying release occurs before the action potential arrives at the terminal, which is physiologically implausible since action potentials drive release.
Option e places the postsynaptic response before neurotransmitter release and receptor binding, which cannot initiate a postsynaptic response without the signaling molecule being present in the cleft.
In sum, only option c maintains causal order: presynaptic electrical event leads to chemical transmission, which then elicits a postsynaptic response, matching the known sequence of synaptic transmission.

My LMS Subjects Practice test (nervous system)

Which of the following is the correct sequence of events that occur during synaptic transmission?

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My LMS Subjects Practice test (nervous system)

Which of the following is the correct sequence of events that occur during synaptic transmission?

View Explanation

Log in for full answers

Similar Questions

Which of the following explains why one-way synaptic transmission occurs?

Question at position 3 Select all the ways a neurotransmitter can exit the space between neurons.DiffusionReuptake/recyclingAxon travelEnzymes will digest the neurotransmitter.Immune cells will attack.

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More Practical Tools for Students Powered by AI Study Helper

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