,NURS 6630 Neurobiology and Psychopharmacology for
Psychiatric Mental Health Advanced Practice Nursing
Exam Prep — Comprehensive Review + Practice MCQs
— Walden University 2025/2026
1. Which neurotransmitter is considered the major excitatory neurotransmitter in the central nervous system?
A. GABA
B. Glutamate
C. Dopamine
D. Serotonin
Correct Answer: B
Rationale: Glutamate is the primary excitatory neurotransmitter in the brain, responsible for most fast synaptic
excitation. GABA is the major inhibitory neurotransmitter, while dopamine and serotonin are modulatory
neurotransmitters involved in mood, reward, and other functions .
2. The PMHNP is explaining synaptic neurotransmission to a graduate student. Which statement correctly
describes the unidirectional flow of chemical neurotransmission within a neuron?
A. Axon terminal → Axon → Cell body → Dendrites
B. Dendrites → Cell body → Axon → Axon terminals
C. Cell body → Dendrites → Axon → Axon terminals
D. Dendrites → Axon → Cell body → Axon terminals
Correct Answer: B
Rationale: Chemical neurotransmission flows from the dendrites (receiving end), through the cell body (soma),
down the axon, to the axon terminals (presynaptic terminals) where neurotransmitters are released into the
synaptic cleft .
,3. G-protein coupled receptors are targets for several psychiatric medications. When a G-protein coupled
receptor is activated in a way that potentiates downstream signaling, what is the ultimate intracellular result?
A. Direct opening of ion channels
B. Activation of second messenger systems
C. Immediate gene transcription
D. Inhibition of neurotransmitter release
Correct Answer: B
Rationale: G-protein coupled receptors, when activated, stimulate intracellular second messenger systems
(such as cAMP or IP3/DAG), which then amplify the signal and produce downstream cellular effects. This is a
key mechanism for many psychiatric drugs .
4. Neurotransmitters are defined by four essential characteristics. Which of the following is NOT one of those
characteristics?
A. Synthesized within presynaptic neurons
B. Released upon presynaptic depolarization
C. Act on postsynaptic receptors to produce a response
D. Metabolized by the liver before reaching the synapse
Correct Answer: D
Rationale: Neurotransmitters are defined by being synthesized in presynaptic neurons, released upon
depolarization, acting on receptors, and having a mechanism for termination of action in the synaptic cleft.
Hepatic metabolism is not a defining characteristic of neurotransmitters .
5. A patient with depression is started on an SSRI. The PMHNP explains that the primary mechanism involves
blockade of the serotonin transporter (SERT). This action ultimately leads to which downstream effect after 2–
4 weeks of treatment?
, A. Immediate increase in postsynaptic serotonin receptor sensitivity
B. Downregulation of 5-HT1A autoreceptors
C. Direct agonism of D2 receptors in the mesolimbic pathway
D. Blockade of NMDA glutamate receptors
Correct Answer: B
Rationale: SSRIs block SERT, increasing synaptic serotonin. Initially, 5-HT1A autoreceptors detect increased
serotonin and reduce neuronal firing. Over 2–4 weeks, these autoreceptors downregulate and desensitize,
allowing enhanced serotonin neurotransmission—this explains the characteristic 2–4 week therapeutic lag .
6. Which neurotransmitter system is primarily responsible for the sedating and appetite-stimulating effects
commonly seen with mirtazapine and quetiapine?
A. Dopamine D2 antagonism
B. Serotonin 5-HT2C antagonism
C. Histamine H1 antagonism
D. Norepinephrine alpha-1 antagonism
Correct Answer: C
Rationale: Histamine H1 receptor antagonism is the primary mechanism for sedation and increased
appetite/weight gain. Both mirtazapine and quetiapine are potent H1 blockers. While 5-HT2C antagonism can
increase appetite, H1 blockade is the dominant mechanism for sedation .
7. A patient taking haloperidol develops acute dystonia within 48 hours of initiation. The PMHNP recognizes
this adverse effect is due to antagonism of which receptor system?
A. 5-HT2A receptors in the prefrontal cortex
B. D2 receptors in the nigrostriatal pathway
Psychiatric Mental Health Advanced Practice Nursing
Exam Prep — Comprehensive Review + Practice MCQs
— Walden University 2025/2026
1. Which neurotransmitter is considered the major excitatory neurotransmitter in the central nervous system?
A. GABA
B. Glutamate
C. Dopamine
D. Serotonin
Correct Answer: B
Rationale: Glutamate is the primary excitatory neurotransmitter in the brain, responsible for most fast synaptic
excitation. GABA is the major inhibitory neurotransmitter, while dopamine and serotonin are modulatory
neurotransmitters involved in mood, reward, and other functions .
2. The PMHNP is explaining synaptic neurotransmission to a graduate student. Which statement correctly
describes the unidirectional flow of chemical neurotransmission within a neuron?
A. Axon terminal → Axon → Cell body → Dendrites
B. Dendrites → Cell body → Axon → Axon terminals
C. Cell body → Dendrites → Axon → Axon terminals
D. Dendrites → Axon → Cell body → Axon terminals
Correct Answer: B
Rationale: Chemical neurotransmission flows from the dendrites (receiving end), through the cell body (soma),
down the axon, to the axon terminals (presynaptic terminals) where neurotransmitters are released into the
synaptic cleft .
,3. G-protein coupled receptors are targets for several psychiatric medications. When a G-protein coupled
receptor is activated in a way that potentiates downstream signaling, what is the ultimate intracellular result?
A. Direct opening of ion channels
B. Activation of second messenger systems
C. Immediate gene transcription
D. Inhibition of neurotransmitter release
Correct Answer: B
Rationale: G-protein coupled receptors, when activated, stimulate intracellular second messenger systems
(such as cAMP or IP3/DAG), which then amplify the signal and produce downstream cellular effects. This is a
key mechanism for many psychiatric drugs .
4. Neurotransmitters are defined by four essential characteristics. Which of the following is NOT one of those
characteristics?
A. Synthesized within presynaptic neurons
B. Released upon presynaptic depolarization
C. Act on postsynaptic receptors to produce a response
D. Metabolized by the liver before reaching the synapse
Correct Answer: D
Rationale: Neurotransmitters are defined by being synthesized in presynaptic neurons, released upon
depolarization, acting on receptors, and having a mechanism for termination of action in the synaptic cleft.
Hepatic metabolism is not a defining characteristic of neurotransmitters .
5. A patient with depression is started on an SSRI. The PMHNP explains that the primary mechanism involves
blockade of the serotonin transporter (SERT). This action ultimately leads to which downstream effect after 2–
4 weeks of treatment?
, A. Immediate increase in postsynaptic serotonin receptor sensitivity
B. Downregulation of 5-HT1A autoreceptors
C. Direct agonism of D2 receptors in the mesolimbic pathway
D. Blockade of NMDA glutamate receptors
Correct Answer: B
Rationale: SSRIs block SERT, increasing synaptic serotonin. Initially, 5-HT1A autoreceptors detect increased
serotonin and reduce neuronal firing. Over 2–4 weeks, these autoreceptors downregulate and desensitize,
allowing enhanced serotonin neurotransmission—this explains the characteristic 2–4 week therapeutic lag .
6. Which neurotransmitter system is primarily responsible for the sedating and appetite-stimulating effects
commonly seen with mirtazapine and quetiapine?
A. Dopamine D2 antagonism
B. Serotonin 5-HT2C antagonism
C. Histamine H1 antagonism
D. Norepinephrine alpha-1 antagonism
Correct Answer: C
Rationale: Histamine H1 receptor antagonism is the primary mechanism for sedation and increased
appetite/weight gain. Both mirtazapine and quetiapine are potent H1 blockers. While 5-HT2C antagonism can
increase appetite, H1 blockade is the dominant mechanism for sedation .
7. A patient taking haloperidol develops acute dystonia within 48 hours of initiation. The PMHNP recognizes
this adverse effect is due to antagonism of which receptor system?
A. 5-HT2A receptors in the prefrontal cortex
B. D2 receptors in the nigrostriatal pathway
