The steps below refer to various stages in transmission at a chemical synapse: 1. Neurotransmitter binds with receptors associated with the postsynaptic membrane.
2) Calcium ions rush into neuron's cytoplasm.
3) An action potential depolarizes the membrane of the axon terminal.
4) The ligand-gated ion channels open.
5) The synaptic vesicles release neurotransmitter into the synaptic cleft.
Which sequence of events is correct?
A)1 → 2 → 3 → 4 → 5
B)2 → 3 → 5 → 4 → 1
C)3 → 2 → 5 → 1 → 4
D)4 → 3 → 1 → 2 → 5
E)5 → 1 → 2 → 4 → 3

Question

Quizplus · Accepted Answer

The correct sequence of events in transmission at a chemical synapse is as follows: 
1. An action potential depolarizes the membrane of the axon terminal (3).
2. Calcium ions rush into the neuron's cytoplasm (2).
3. The synaptic vesicles release neurotransmitter into the synaptic cleft (5).
4. Neurotransmitter binds with receptors associated with the postsynaptic membrane (1).
5. The ligand-gated ion channels open (4). 
Therefore, the correct sequence of events is 3 → 2 → 5 → 1 → 4, which is represented by choice C.

The Steps Below Refer to Various Stages in Transmission at a Chemical