While discussing the central nervous system (CNS), the nursing instructor tells the students that the major inhibitory neurotransmitter in the CNS is what?
A) Acetylcholine
B) Dopamine
C) Gamma-aminobutyric acid (GABA)
D) Serotonin
C
Feedback:
GABA, which is found in the brain, inhibits nerve activity and is important in preventing overexcitability or stimulation such as seizure activity. Acetylcholine, which communicates between nerves and muscles, is also important as the preganglionic neurotransmitter throughout the autonomic nervous system and as the postganglionic neurotransmitter in the parasympathetic nervous system and in several pathways in the brain. Dopamine is involved in the coordination of impulses and responses, both motor and intellectual. Acetylcholine, dopamine, and serotonin are not the major inhibitory neurotransmitter in the CNS. Serotonin is important in arousal and sleep.
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