Premium
PDF
PDF
Download Download
EXAMS
(Neuro) Question & Answers 100% pass | Questions & Answers (Verified
Answers) With Rationales ( Update)
This Document Contains:
138 Questions with Correct, Detailed and Verified Answers
2026/2027 Actual Quiz Testbank
Questions & Answers (Verified Answers) With Rationales
100% Guaranteed Pass
Complete A+ Guide
Page 1
,Question 1
A 45-year-old patient with major depressive disorder has been on escitalopram for 8 weeks with
minimal improvement. The provider considers augmentation with a second-generation
antipsychotic. Which of the following mechanisms best explains the synergistic effect of combining
an SSRI with a D2 receptor partial agonist?
A) Enhanced serotonergic tone via 5-HT1A autoreceptor desensitization
B) Increased dopamine release in prefrontal cortex due to 5-HT2A antagonism
C) Modulation of glutamatergic transmission through mGluR2/3 receptors
D) Inhibition of norepinephrine reuptake at the synaptic cleft
Answer: B) Increased dopamine release in prefrontal cortex due to 5-HT2A antagonism
Explanation: D2 partial agonists like aripiprazole increase dopamine release in the prefrontal cortex,
which is under tonic inhibition by serotonin via 5-HT2A receptors. SSRI-induced
serotonin elevation activates 5-HT2A receptors, reducing dopamine release; antagonism
of these receptors by the antipsychotic restores dopamine levels, enhancing
antidepressant efficacy. Option A is incorrect because 5-HT1A autoreceptor
desensitization is primarily involved in SSRI onset, not augmentation. Option C is not a
primary mechanism for this combination. Option D describes an SNRI, not an SSRI.
Question 2
In a study of synaptic plasticity, researchers observe that long-term potentiation (LTP) in
hippocampal CA1 neurons is blocked by an NMDA receptor antagonist. However, a separate form
of LTP induced by a different protocol is resistant to this antagonist. Which of the following
mechanisms is most likely responsible for the antagonist-resistant LTP?
A) Presynaptic increase in glutamate release via P/Q-type calcium channels
B) Activation of AMPA receptors lacking GluA2 subunits, allowing calcium influx
C) Metabotropic glutamate receptor (mGluR) activation leading to dendritic protein synthesis
D) Voltage-gated calcium channel (VGCC) activation independent of NMDA receptors
Answer: D) Voltage-gated calcium channel (VGCC) activation independent of NMDA receptors
Explanation: NMDA receptor-independent LTP can be mediated by high-frequency stimulation that
strongly depolarizes the postsynaptic membrane, opening voltage-gated calcium
channels (VGCCs) and allowing calcium influx to trigger plasticity. Option A is
incorrect because presynaptic mechanisms alone cannot sustain LTP without
postsynaptic calcium. Option B is incorrect; calcium-permeable AMPA receptors are
involved in some forms of plasticity but are typically NMDA-dependent. Option C
describes a form of mGluR-dependent LTD, not LTP.
Page 2
,Question 3
A patient with chronic neuropathic pain is prescribed gabapentin. The provider explains that
gabapentin binds to the ±2´ subunit of voltage-gated calcium channels. Which of the following best
describes the functional consequence of this binding that contributes to its analgesic effect?
A) It enhances the inactivation of sodium channels, reducing action potential propagation
B) It reduces the trafficking of calcium channels to the presynaptic membrane
C) It blocks the pore of the calcium channel, directly inhibiting calcium influx
D) It increases GABA synthesis by activating glutamic acid decarboxylase
Answer: B) It reduces the trafficking of calcium channels to the presynaptic membrane
Explanation: Gabapentin binds to the ±2´ subunit and reduces the trafficking of voltage-gated
calcium channels to the presynaptic membrane, thereby decreasing calcium influx and
neurotransmitter release (e.g., glutamate, substance P) in nociceptive pathways. Option
A is incorrect; gabapentin does not affect sodium channels. Option C is incorrect; it
does not block the channel pore. Option D is incorrect; gabapentin does not directly
affect GABA synthesis, though it may indirectly modulate GABAergic transmission.
Question 4
Which of the following statements best describes the role of the locus coeruleus in the
pathophysiology of attention-deficit/hyperactivity disorder (ADHD)?
A) Hyperactivity of the locus coeruleus leads to excessive norepinephrine release, causing inattention
B) Hypoactivity of the locus coeruleus results in reduced norepinephrine signaling, impairing
sustained attention
C) Dysregulation of the locus coeruleus alters dopamine beta-hydroxylase activity, affecting
dopamine-norepinephrine balance
D) The locus coeruleus primarily modulates cholinergic transmission, which is deficient in ADHD
Answer: B) Hypoactivity of the locus coeruleus results in reduced norepinephrine signaling,
impairing sustained attention
Explanation: The locus coeruleus is the primary source of norepinephrine in the brain, and its
hypoactivity is associated with reduced tonic norepinephrine release, leading to
impaired sustained attention and arousal, core features of ADHD. Option A is incorrect;
hyperactivity would cause hyperarousal, not inattention. Option C describes a
biochemical pathway but not the primary pathophysiological role. Option D is incorrect;
the locus coeruleus is noradrenergic, not cholinergic.
Page 3
, Question 5
A researcher is investigating the effects of a novel compound on synaptic transmission. The
compound is found to inhibit the vesicular monoamine transporter 2 (VMAT2). Which of the
following neurotransmitter systems would be most directly affected by this inhibition?
A) Glutamatergic and GABAergic systems
B) Dopaminergic, noradrenergic, and serotonergic systems
C) Cholinergic and histaminergic systems
D) Peptidergic systems including endogenous opioids
Answer: B) Dopaminergic, noradrenergic, and serotonergic systems
Explanation: VMAT2 is responsible for packaging monoamines (dopamine, norepinephrine,
serotonin) into synaptic vesicles for release. Inhibition of VMAT2 depletes vesicular
stores, reducing quantal release of these neurotransmitters. Option A is incorrect;
glutamate and GABA are not transported by VMAT2. Option C is incorrect;
acetylcholine and histamine are not monoamines. Option D is incorrect; neuropeptides
are packaged by different transporters.
Question 6
In a patient with treatment-resistant schizophrenia, clozapine is initiated. Which of the following
receptor binding profiles best explains clozapine's unique efficacy and side effect profile compared
to typical antipsychotics?
A) High D2 receptor occupancy with low 5-HT2A occupancy
B) Low D2 receptor occupancy with high 5-HT2A occupancy and broad muscarinic antagonism
C) High D2 receptor occupancy with high 5-HT2A occupancy and moderate histamine H1 antagonism
D) Low D2 receptor occupancy with moderate 5-HT2A occupancy and high alpha-1 antagonism
Answer: B) Low D2 receptor occupancy with high 5-HT2A occupancy and broad muscarinic
antagonism
Explanation: Clozapine has relatively low D2 receptor occupancy (around 30-60%) compared to
typical antipsychotics (70-80%), which reduces extrapyramidal symptoms. Its high
5-HT2A occupancy contributes to efficacy in negative symptoms and reduced motor
side effects. Broad muscarinic antagonism (M1, M3) explains anticholinergic side
effects like constipation and salivation. Option A describes typical antipsychotics.
Option C describes risperidone-like profiles. Option D describes low D2 occupancy but
lacks the muscarinic antagonism that distinguishes clozapine.
Page 4
Download Download
EXAMS
(Neuro) Question & Answers 100% pass | Questions & Answers (Verified
Answers) With Rationales ( Update)
This Document Contains:
138 Questions with Correct, Detailed and Verified Answers
2026/2027 Actual Quiz Testbank
Questions & Answers (Verified Answers) With Rationales
100% Guaranteed Pass
Complete A+ Guide
Page 1
,Question 1
A 45-year-old patient with major depressive disorder has been on escitalopram for 8 weeks with
minimal improvement. The provider considers augmentation with a second-generation
antipsychotic. Which of the following mechanisms best explains the synergistic effect of combining
an SSRI with a D2 receptor partial agonist?
A) Enhanced serotonergic tone via 5-HT1A autoreceptor desensitization
B) Increased dopamine release in prefrontal cortex due to 5-HT2A antagonism
C) Modulation of glutamatergic transmission through mGluR2/3 receptors
D) Inhibition of norepinephrine reuptake at the synaptic cleft
Answer: B) Increased dopamine release in prefrontal cortex due to 5-HT2A antagonism
Explanation: D2 partial agonists like aripiprazole increase dopamine release in the prefrontal cortex,
which is under tonic inhibition by serotonin via 5-HT2A receptors. SSRI-induced
serotonin elevation activates 5-HT2A receptors, reducing dopamine release; antagonism
of these receptors by the antipsychotic restores dopamine levels, enhancing
antidepressant efficacy. Option A is incorrect because 5-HT1A autoreceptor
desensitization is primarily involved in SSRI onset, not augmentation. Option C is not a
primary mechanism for this combination. Option D describes an SNRI, not an SSRI.
Question 2
In a study of synaptic plasticity, researchers observe that long-term potentiation (LTP) in
hippocampal CA1 neurons is blocked by an NMDA receptor antagonist. However, a separate form
of LTP induced by a different protocol is resistant to this antagonist. Which of the following
mechanisms is most likely responsible for the antagonist-resistant LTP?
A) Presynaptic increase in glutamate release via P/Q-type calcium channels
B) Activation of AMPA receptors lacking GluA2 subunits, allowing calcium influx
C) Metabotropic glutamate receptor (mGluR) activation leading to dendritic protein synthesis
D) Voltage-gated calcium channel (VGCC) activation independent of NMDA receptors
Answer: D) Voltage-gated calcium channel (VGCC) activation independent of NMDA receptors
Explanation: NMDA receptor-independent LTP can be mediated by high-frequency stimulation that
strongly depolarizes the postsynaptic membrane, opening voltage-gated calcium
channels (VGCCs) and allowing calcium influx to trigger plasticity. Option A is
incorrect because presynaptic mechanisms alone cannot sustain LTP without
postsynaptic calcium. Option B is incorrect; calcium-permeable AMPA receptors are
involved in some forms of plasticity but are typically NMDA-dependent. Option C
describes a form of mGluR-dependent LTD, not LTP.
Page 2
,Question 3
A patient with chronic neuropathic pain is prescribed gabapentin. The provider explains that
gabapentin binds to the ±2´ subunit of voltage-gated calcium channels. Which of the following best
describes the functional consequence of this binding that contributes to its analgesic effect?
A) It enhances the inactivation of sodium channels, reducing action potential propagation
B) It reduces the trafficking of calcium channels to the presynaptic membrane
C) It blocks the pore of the calcium channel, directly inhibiting calcium influx
D) It increases GABA synthesis by activating glutamic acid decarboxylase
Answer: B) It reduces the trafficking of calcium channels to the presynaptic membrane
Explanation: Gabapentin binds to the ±2´ subunit and reduces the trafficking of voltage-gated
calcium channels to the presynaptic membrane, thereby decreasing calcium influx and
neurotransmitter release (e.g., glutamate, substance P) in nociceptive pathways. Option
A is incorrect; gabapentin does not affect sodium channels. Option C is incorrect; it
does not block the channel pore. Option D is incorrect; gabapentin does not directly
affect GABA synthesis, though it may indirectly modulate GABAergic transmission.
Question 4
Which of the following statements best describes the role of the locus coeruleus in the
pathophysiology of attention-deficit/hyperactivity disorder (ADHD)?
A) Hyperactivity of the locus coeruleus leads to excessive norepinephrine release, causing inattention
B) Hypoactivity of the locus coeruleus results in reduced norepinephrine signaling, impairing
sustained attention
C) Dysregulation of the locus coeruleus alters dopamine beta-hydroxylase activity, affecting
dopamine-norepinephrine balance
D) The locus coeruleus primarily modulates cholinergic transmission, which is deficient in ADHD
Answer: B) Hypoactivity of the locus coeruleus results in reduced norepinephrine signaling,
impairing sustained attention
Explanation: The locus coeruleus is the primary source of norepinephrine in the brain, and its
hypoactivity is associated with reduced tonic norepinephrine release, leading to
impaired sustained attention and arousal, core features of ADHD. Option A is incorrect;
hyperactivity would cause hyperarousal, not inattention. Option C describes a
biochemical pathway but not the primary pathophysiological role. Option D is incorrect;
the locus coeruleus is noradrenergic, not cholinergic.
Page 3
, Question 5
A researcher is investigating the effects of a novel compound on synaptic transmission. The
compound is found to inhibit the vesicular monoamine transporter 2 (VMAT2). Which of the
following neurotransmitter systems would be most directly affected by this inhibition?
A) Glutamatergic and GABAergic systems
B) Dopaminergic, noradrenergic, and serotonergic systems
C) Cholinergic and histaminergic systems
D) Peptidergic systems including endogenous opioids
Answer: B) Dopaminergic, noradrenergic, and serotonergic systems
Explanation: VMAT2 is responsible for packaging monoamines (dopamine, norepinephrine,
serotonin) into synaptic vesicles for release. Inhibition of VMAT2 depletes vesicular
stores, reducing quantal release of these neurotransmitters. Option A is incorrect;
glutamate and GABA are not transported by VMAT2. Option C is incorrect;
acetylcholine and histamine are not monoamines. Option D is incorrect; neuropeptides
are packaged by different transporters.
Question 6
In a patient with treatment-resistant schizophrenia, clozapine is initiated. Which of the following
receptor binding profiles best explains clozapine's unique efficacy and side effect profile compared
to typical antipsychotics?
A) High D2 receptor occupancy with low 5-HT2A occupancy
B) Low D2 receptor occupancy with high 5-HT2A occupancy and broad muscarinic antagonism
C) High D2 receptor occupancy with high 5-HT2A occupancy and moderate histamine H1 antagonism
D) Low D2 receptor occupancy with moderate 5-HT2A occupancy and high alpha-1 antagonism
Answer: B) Low D2 receptor occupancy with high 5-HT2A occupancy and broad muscarinic
antagonism
Explanation: Clozapine has relatively low D2 receptor occupancy (around 30-60%) compared to
typical antipsychotics (70-80%), which reduces extrapyramidal symptoms. Its high
5-HT2A occupancy contributes to efficacy in negative symptoms and reduced motor
side effects. Broad muscarinic antagonism (M1, M3) explains anticholinergic side
effects like constipation and salivation. Option A describes typical antipsychotics.
Option C describes risperidone-like profiles. Option D describes low D2 occupancy but
lacks the muscarinic antagonism that distinguishes clozapine.
Page 4
