50. Place the events in chemical synapse transmission in the correct order
(1) Ca2+ enters axon terminal.
(2) Ligand-gated ion channels open in postsynaptic membrane.
(3) Neurotransmitter binds to postsynaptic receptor.
(4) Action potential reaches axon terminal of presynaptic neuron.
(5) Neurotransmitter released by exocytosis.
a. 4, 1, 5, 3, 2
b. 4, 3, 1, 5, 2
c. 4, 5, 1, 3, 2
d. 4, 1, 3, 5, 2
e. 4, 5, 2, 3, 1
ANSWER: a
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