NSG 552 EXAMS 1–3 – PSYCHOPHARMACOLOGY
Complete 200-Question Test Bank with NGN Case Scenarios
& Detailed Rationales
Wilkes University | 2026/2027 Edition | 100% Pass
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Question 1
A PMHNP student is studying the basic principles of neurotransmission. Which neurotransmitter
is the primary excitatory neurotransmitter in the central nervous system?
A) GABA
B) Glutamate
C) Dopamine
D) Serotonin
Answer: B) Glutamate
Rationale: Glutamate is the major excitatory neurotransmitter in the CNS, involved in learning,
memory, and synaptic plasticity. GABA is the primary inhibitory neurotransmitter. Dopamine
and serotonin are neuromodulators with more specific roles in reward, mood, and cognition .
Question 2
The primary inhibitory neurotransmitter in the central nervous system that induces calmness
and relaxation is:
A) Glutamate
B) Dopamine
C) GABA
D) Norepinephrine
Answer: C) GABA
Rationale: GABA (gamma-aminobutyric acid) is the main inhibitory neurotransmitter in the CNS.
It hyperpolarizes postsynaptic membranes by opening chloride channels, reducing neuronal
firing. This inhibitory action produces calming, sedative, and anxiolytic effects. GABA
dysfunction is implicated in anxiety disorders and epilepsy .
,Question 3
The opening of which ion channel is primarily responsible for initiating an action potential?
A) Potassium channels
B) Sodium channels
C) Calcium channels
D) Chloride channels
Answer: B) Sodium channels
Rationale: Voltage-gated sodium channels open in response to depolarization, allowing sodium
influx and rapid depolarization of the neuron, which initiates the action potential. Potassium
channels then open for repolarization, and calcium channels are involved in neurotransmitter
release .
Question 4
Which part of the neuron is primarily responsible for receiving signals from other neurons?
A) Axon
B) Dendrites
C) Myelin sheath
D) Soma
Answer: B) Dendrites
Rationale: Dendrites receive incoming electrical and chemical signals from other neurons and
transmit them toward the cell body. The axon transmits signals away from the cell body, and the
myelin sheath speeds conduction .
Question 5
Which receptor type produces rapid, short-lived effects by directly opening ion channels?
A) G-protein coupled receptors (metabotropic)
B) Ionotropic receptors
C) Tyrosine kinase receptors
D) Nuclear receptors
,Answer: B) Ionotropic receptors
Rationale: Ionotropic receptors (e.g., GABA-A, NMDA, AMPA, nicotinic ACh) are ligand-gated ion
channels that open directly upon neurotransmitter binding, producing fast synaptic
transmission (milliseconds). Metabotropic receptors (GPCRs) produce slower but more
prolonged effects via second messenger systems .
Question 6
Which receptor type produces slower but longer-lasting effects via second messenger systems?
A) Ionotropic receptors
B) Metabotropic receptors (G-protein coupled)
C) Voltage-gated channels
D) Gap junctions
Answer: B) Metabotropic receptors (G-protein coupled)
Rationale: Metabotropic receptors are G-protein coupled receptors (GPCRs) that activate
intracellular second messenger cascades (cAMP, IP3, DAG), resulting in slower but more
prolonged and diverse effects. This receptor type is the target for many psychotropic
medications .
Question 7
The monoamine hypothesis of depression proposes that depression is caused by a deficiency in
which neurotransmitters?
A) GABA and glutamate
B) Serotonin and norepinephrine
C) Acetylcholine and histamine
D) Dopamine and glycine
Answer: B) Serotonin and norepinephrine
Rationale: The monoamine hypothesis suggests that decreased availability of serotonin,
norepinephrine, and/or dopamine in the synaptic cleft contributes to depressive symptoms.
This is the basis for most antidepressant mechanisms, including SSRIs, SNRIs, and MAOIs .
Question 8
, Which enzyme is responsible for breaking down monoamine neurotransmitters within the
presynaptic neuron?
A) Acetylcholinesterase
B) Monoamine oxidase (MAO)
C) Catechol-O-methyltransferase (COMT)
D) Decarboxylase
Answer: B) Monoamine oxidase (MAO)
Rationale: MAO is the primary enzyme responsible for breaking down monoamine
neurotransmitters (serotonin, norepinephrine, dopamine) within the presynaptic neuron.
MAOIs block this enzyme, increasing neurotransmitter availability. COMT breaks down
catecholamines in the synapse, and acetylcholinesterase breaks down acetylcholine .
Question 9
The process by which neurotransmitters are recycled back into the presynaptic neuron after
release is called:
A) Enzymatic degradation
B) Reuptake
C) Exocytosis
D) Diffusion
Answer: B) Reuptake
Rationale: Reuptake via specific transporters (SERT for serotonin, DAT for dopamine, NET for
norepinephrine) terminates neurotransmitter action and recycles them into the presynaptic
neuron for storage or degradation. SSRIs and SNRIs block reuptake to increase synaptic
neurotransmitter levels .
Question 10
Which dopamine pathway is primarily responsible for the positive symptoms of schizophrenia
(hallucinations, delusions)?
A) Nigrostriatal pathway
B) Mesolimbic pathway
C) Mesocortical pathway
D) Tuberoinfundibular pathway
Complete 200-Question Test Bank with NGN Case Scenarios
& Detailed Rationales
Wilkes University | 2026/2027 Edition | 100% Pass
Guarantee
Question 1
A PMHNP student is studying the basic principles of neurotransmission. Which neurotransmitter
is the primary excitatory neurotransmitter in the central nervous system?
A) GABA
B) Glutamate
C) Dopamine
D) Serotonin
Answer: B) Glutamate
Rationale: Glutamate is the major excitatory neurotransmitter in the CNS, involved in learning,
memory, and synaptic plasticity. GABA is the primary inhibitory neurotransmitter. Dopamine
and serotonin are neuromodulators with more specific roles in reward, mood, and cognition .
Question 2
The primary inhibitory neurotransmitter in the central nervous system that induces calmness
and relaxation is:
A) Glutamate
B) Dopamine
C) GABA
D) Norepinephrine
Answer: C) GABA
Rationale: GABA (gamma-aminobutyric acid) is the main inhibitory neurotransmitter in the CNS.
It hyperpolarizes postsynaptic membranes by opening chloride channels, reducing neuronal
firing. This inhibitory action produces calming, sedative, and anxiolytic effects. GABA
dysfunction is implicated in anxiety disorders and epilepsy .
,Question 3
The opening of which ion channel is primarily responsible for initiating an action potential?
A) Potassium channels
B) Sodium channels
C) Calcium channels
D) Chloride channels
Answer: B) Sodium channels
Rationale: Voltage-gated sodium channels open in response to depolarization, allowing sodium
influx and rapid depolarization of the neuron, which initiates the action potential. Potassium
channels then open for repolarization, and calcium channels are involved in neurotransmitter
release .
Question 4
Which part of the neuron is primarily responsible for receiving signals from other neurons?
A) Axon
B) Dendrites
C) Myelin sheath
D) Soma
Answer: B) Dendrites
Rationale: Dendrites receive incoming electrical and chemical signals from other neurons and
transmit them toward the cell body. The axon transmits signals away from the cell body, and the
myelin sheath speeds conduction .
Question 5
Which receptor type produces rapid, short-lived effects by directly opening ion channels?
A) G-protein coupled receptors (metabotropic)
B) Ionotropic receptors
C) Tyrosine kinase receptors
D) Nuclear receptors
,Answer: B) Ionotropic receptors
Rationale: Ionotropic receptors (e.g., GABA-A, NMDA, AMPA, nicotinic ACh) are ligand-gated ion
channels that open directly upon neurotransmitter binding, producing fast synaptic
transmission (milliseconds). Metabotropic receptors (GPCRs) produce slower but more
prolonged effects via second messenger systems .
Question 6
Which receptor type produces slower but longer-lasting effects via second messenger systems?
A) Ionotropic receptors
B) Metabotropic receptors (G-protein coupled)
C) Voltage-gated channels
D) Gap junctions
Answer: B) Metabotropic receptors (G-protein coupled)
Rationale: Metabotropic receptors are G-protein coupled receptors (GPCRs) that activate
intracellular second messenger cascades (cAMP, IP3, DAG), resulting in slower but more
prolonged and diverse effects. This receptor type is the target for many psychotropic
medications .
Question 7
The monoamine hypothesis of depression proposes that depression is caused by a deficiency in
which neurotransmitters?
A) GABA and glutamate
B) Serotonin and norepinephrine
C) Acetylcholine and histamine
D) Dopamine and glycine
Answer: B) Serotonin and norepinephrine
Rationale: The monoamine hypothesis suggests that decreased availability of serotonin,
norepinephrine, and/or dopamine in the synaptic cleft contributes to depressive symptoms.
This is the basis for most antidepressant mechanisms, including SSRIs, SNRIs, and MAOIs .
Question 8
, Which enzyme is responsible for breaking down monoamine neurotransmitters within the
presynaptic neuron?
A) Acetylcholinesterase
B) Monoamine oxidase (MAO)
C) Catechol-O-methyltransferase (COMT)
D) Decarboxylase
Answer: B) Monoamine oxidase (MAO)
Rationale: MAO is the primary enzyme responsible for breaking down monoamine
neurotransmitters (serotonin, norepinephrine, dopamine) within the presynaptic neuron.
MAOIs block this enzyme, increasing neurotransmitter availability. COMT breaks down
catecholamines in the synapse, and acetylcholinesterase breaks down acetylcholine .
Question 9
The process by which neurotransmitters are recycled back into the presynaptic neuron after
release is called:
A) Enzymatic degradation
B) Reuptake
C) Exocytosis
D) Diffusion
Answer: B) Reuptake
Rationale: Reuptake via specific transporters (SERT for serotonin, DAT for dopamine, NET for
norepinephrine) terminates neurotransmitter action and recycles them into the presynaptic
neuron for storage or degradation. SSRIs and SNRIs block reuptake to increase synaptic
neurotransmitter levels .
Question 10
Which dopamine pathway is primarily responsible for the positive symptoms of schizophrenia
(hallucinations, delusions)?
A) Nigrostriatal pathway
B) Mesolimbic pathway
C) Mesocortical pathway
D) Tuberoinfundibular pathway
