Beginning at the synapse of a neuron, place the following events in the proper order to indicate the correct sequence of events in neuronal signaling
1. Ion channels bind the ligand and open.
2. Na+ is pumped out of the cell and the membrane potential is restored.
3. Acetylcholinesterase breaks down acetylcholine.
4. Na+ enters the cell and the membrane potential changes.
5. Acetylcholine is released into the synapse.
6. Ion channels close.
A. 1, 2, 3, 4, 5, 6
B. 3, 4, 6, 1, 5, 2
C. 6, 4, 3, 1, 2, 5
D. 5, 1, 4, 3, 6, 2
E. 4, 5, 1, 2, 6, 3
D
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