The Following Are the Steps Involved in Transmission at a Cholinergic

question 68

Multiple Choice

The following are the steps involved in transmission at a cholinergic synapse.
1) Chemically gated sodium channels on the postsynaptic membrane are activated.
2) Calcium ions enter the synaptic knob.
3) Acetylcholinesterase hydrolyzes acetylcholine.
4) An action potential depolarizes the synaptic knob at the presynaptic membrane.
5) The synaptic knob reabsorbs choline.
6) Acetylcholine is released from storage vesicles by exocytosis.
7) Acetylcholine binds to receptors on the postsynaptic membrane.
8) Calcium ions are removed from the cytoplasm of the synaptic knob.
The correct sequence for these events is

• A) 4, 2, 6, 7, 8, 5, 3, 1.
• B) 4, 2, 6, 7, 1, 8, 3, 5.
• C) 2, 4, 6, 7, 1, 8, 3, 5.
• D) 2, 5, 4, 6, 7, 1, 8, 3.
• E) 6, 4, 2, 7, 1, 8, 3, 5.

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