Which of the following is true of neurotransmitter function?
A) Neurotransmitters diffuse widely across the brain to exert changes in metabolism.
B) Neurotransmitters directly alter ion channels using a second-messenger chemical.
C) Neurotransmitters are released into the synapse from the cistaerna.
D) Neurotransmitters open ion channels in the postsynaptic membrane.
E) Neurotransmitters alter ion channel activity for minutes.
Answer: D
Rationale: Neurotransmitters open ion channels in the postsynaptic membrane.
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