The following steps 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 presynaptic 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
C
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indicated by a. A. b. B. c. C. d. E. e. both A and B
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