NU 545 ADVANCE PATHOPHYSIOLOGY UNIT 2 EXAM: NERVOUS SYSTEM
& NEURO-PATHOPHYSIOLOGY QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTION NEW UPDATE 2026-2027 GRADED A+
47 QUESTIONS
TABLE OF CONTENTS
# TOPIC
1 Differentiate molecular mechanisms of neuronal injury (excitotoxicity, oxidative stress, protein misfolding)
and map them to disease phenotypes
2 Analyze synaptic, channelopathic, and demyelinating disorders using ion channel physiology and
neurotransmission principles
3 Integrate neuroanatomical localization with clinical findings to predict lesion sites and progression
4 Evaluate current diagnostic biomarkers and mechanism-based therapies for neuro-pathophysiologic
conditions
5 NU 545 Advance Pathophysiology Unit 2 Exam
6 Nervous System & Neuro
7 Pathophysiology Questions and Answers with Complete Solution New Update 2026
8 2027 Graded A+
9 Foundations of Advanced Pathophysiology - Nervous System & Neuro-Pathophysiology
10 Applied Advanced Pathophysiology - Nervous System & Neuro-Pathophysiology
11 Advanced Advanced Pathophysiology - Nervous System & Neuro-Pathophysiology
12 Advanced Pathophysiology - Nervous System & Neuro-Pathophysiology Review
ABSTRACT
Page 1
,This study document brings together 47 carefully worded exam questions drawn from NU 545
Advance Pathophysiology Unit 2 Exam: Nervous System & Neuro-Pathophysiology Questions and
Answers with Complete Solution New Update 2026-2027 Graded A+, with the strongest emphasis
placed on Differentiate molecular mechanisms of neuronal injury (excitotoxicity, oxidative stress,
protein misfolding) and map them to disease phenotypes, Analyze synaptic, channelopathic, and
demyelinating disorders using ion channel physiology and neurotransmission principles and
Integrate neuroanatomical localization with clinical findings to predict lesion sites and progression.
Every item follows the wording style and level of reasoning you meet in the real paper, and each
one is paired with a clear rationale so the correct choice is never a guess. Work through the set at
your own pace, mark the questions that slow you down, then come back to them until the
reasoning feels automatic. Learners who revise this way walk into the exam room recognising the
pattern behind the questions instead of meeting them for the first time. Keep going - steady, honest
practice is what turns a difficult paper into a comfortable pass.
Q1 DIFFERENTIATE MOLECULAR MECHANISMS OF NEURONAL INJURY (EXCITOTOXICITY,
OXIDATIVE STRESS, PROTEIN MISFOLDING) AND MAP THEM TO DISEASE PHENOTYPES
In a neuron undergoing sustained glutamate exposure, which sequence best
explains delayed calcium-dependent necrosis rather than apoptosis?
A. NMDA receptor overactivation -> Ca² influx -> calpain and nNOS activation -> mitochondrial
permeability transition pore opening CORRECT
B. AMPA receptor desensitization -> Na/K ATPase failure -> cytochrome c release -> caspase-3
cleavage
C. Metabotropic glutamate receptor activation -> IP-mediated Ca² release -> Bcl-2 upregulation
-> lysosomal rupture
D. Reverse Na/Ca² exchanger operation -> cytosolic Ca² clearance -> caspase-independent
PARP inhibition
RATIONALE: Excitotoxic necrosis is driven by NMDA-mediated Ca² overload, activating calpains
and nNOS; mitochondrial permeability transition pore opening dissipates m and causes ATP
collapse, favoring necrosis over caspase-dependent apoptosis. Distractors misassign receptor
subtypes, ion gradients, or downstream effectors.
Page 2
, Q2 DIFFERENTIATE MOLECULAR MECHANISMS OF NEURONAL INJURY (EXCITOTOXICITY,
OXIDATIVE STRESS, PROTEIN MISFOLDING) AND MAP THEM TO DISEASE PHENOTYPES
A patient with anti-NMDA receptor encephalitis is most likely to exhibit which
pathophysiologic mechanism underlying the psychiatric and seizure
manifestations?
A. Antibody-mediated internalization of NMDA receptors, reducing synaptic currents and
disrupting glutamatergic signaling CORRECT
B. Complement-mediated destruction of GABAergic interneurons in the hippocampus
C. Direct antibody blockade of voltage-gated potassium channels causing hyperexcitability
D. Antibody-induced upregulation of AMPA receptors leading to excitotoxic injury
RATIONALE: Anti-NMDAR encephalitis involves IgG antibodies against the GluN1 subunit,
causing receptor crosslinking and internalization, which reduces NMDAR-mediated currents and
produces neuropsychiatric symptoms and seizures. Other options incorrectly implicate
GABAergic loss, potassium channels, or AMPA upregulation.
Q3 DIFFERENTIATE MOLECULAR MECHANISMS OF NEURONAL INJURY (EXCITOTOXICITY,
OXIDATIVE STRESS, PROTEIN MISFOLDING) AND MAP THEM TO DISEASE PHENOTYPES
Which finding best localizes a lesion to the medial longitudinal fasciculus (MLF)
rather than the abducens nucleus?
A. Impaired adduction of the ipsilateral eye with preserved convergence CORRECT
B. Impaired abduction of the ipsilateral eye with diplopia on lateral gaze
C. Downbeat nystagmus on upward gaze with vertigo
D. Bilateral ptosis with impaired upward gaze
RATIONALE: MLF lesions cause internuclear ophthalmoplegia: failure of adduction in the
ipsilateral eye with intact convergence, because the MLF carries signals from the abducens
internuclear neurons to the contralateral oculomotor nucleus. Abducens nuclear lesions cause
abduction deficit; other options reflect different brainstem/cerebellar sites.
Page 3
& NEURO-PATHOPHYSIOLOGY QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTION NEW UPDATE 2026-2027 GRADED A+
47 QUESTIONS
TABLE OF CONTENTS
# TOPIC
1 Differentiate molecular mechanisms of neuronal injury (excitotoxicity, oxidative stress, protein misfolding)
and map them to disease phenotypes
2 Analyze synaptic, channelopathic, and demyelinating disorders using ion channel physiology and
neurotransmission principles
3 Integrate neuroanatomical localization with clinical findings to predict lesion sites and progression
4 Evaluate current diagnostic biomarkers and mechanism-based therapies for neuro-pathophysiologic
conditions
5 NU 545 Advance Pathophysiology Unit 2 Exam
6 Nervous System & Neuro
7 Pathophysiology Questions and Answers with Complete Solution New Update 2026
8 2027 Graded A+
9 Foundations of Advanced Pathophysiology - Nervous System & Neuro-Pathophysiology
10 Applied Advanced Pathophysiology - Nervous System & Neuro-Pathophysiology
11 Advanced Advanced Pathophysiology - Nervous System & Neuro-Pathophysiology
12 Advanced Pathophysiology - Nervous System & Neuro-Pathophysiology Review
ABSTRACT
Page 1
,This study document brings together 47 carefully worded exam questions drawn from NU 545
Advance Pathophysiology Unit 2 Exam: Nervous System & Neuro-Pathophysiology Questions and
Answers with Complete Solution New Update 2026-2027 Graded A+, with the strongest emphasis
placed on Differentiate molecular mechanisms of neuronal injury (excitotoxicity, oxidative stress,
protein misfolding) and map them to disease phenotypes, Analyze synaptic, channelopathic, and
demyelinating disorders using ion channel physiology and neurotransmission principles and
Integrate neuroanatomical localization with clinical findings to predict lesion sites and progression.
Every item follows the wording style and level of reasoning you meet in the real paper, and each
one is paired with a clear rationale so the correct choice is never a guess. Work through the set at
your own pace, mark the questions that slow you down, then come back to them until the
reasoning feels automatic. Learners who revise this way walk into the exam room recognising the
pattern behind the questions instead of meeting them for the first time. Keep going - steady, honest
practice is what turns a difficult paper into a comfortable pass.
Q1 DIFFERENTIATE MOLECULAR MECHANISMS OF NEURONAL INJURY (EXCITOTOXICITY,
OXIDATIVE STRESS, PROTEIN MISFOLDING) AND MAP THEM TO DISEASE PHENOTYPES
In a neuron undergoing sustained glutamate exposure, which sequence best
explains delayed calcium-dependent necrosis rather than apoptosis?
A. NMDA receptor overactivation -> Ca² influx -> calpain and nNOS activation -> mitochondrial
permeability transition pore opening CORRECT
B. AMPA receptor desensitization -> Na/K ATPase failure -> cytochrome c release -> caspase-3
cleavage
C. Metabotropic glutamate receptor activation -> IP-mediated Ca² release -> Bcl-2 upregulation
-> lysosomal rupture
D. Reverse Na/Ca² exchanger operation -> cytosolic Ca² clearance -> caspase-independent
PARP inhibition
RATIONALE: Excitotoxic necrosis is driven by NMDA-mediated Ca² overload, activating calpains
and nNOS; mitochondrial permeability transition pore opening dissipates m and causes ATP
collapse, favoring necrosis over caspase-dependent apoptosis. Distractors misassign receptor
subtypes, ion gradients, or downstream effectors.
Page 2
, Q2 DIFFERENTIATE MOLECULAR MECHANISMS OF NEURONAL INJURY (EXCITOTOXICITY,
OXIDATIVE STRESS, PROTEIN MISFOLDING) AND MAP THEM TO DISEASE PHENOTYPES
A patient with anti-NMDA receptor encephalitis is most likely to exhibit which
pathophysiologic mechanism underlying the psychiatric and seizure
manifestations?
A. Antibody-mediated internalization of NMDA receptors, reducing synaptic currents and
disrupting glutamatergic signaling CORRECT
B. Complement-mediated destruction of GABAergic interneurons in the hippocampus
C. Direct antibody blockade of voltage-gated potassium channels causing hyperexcitability
D. Antibody-induced upregulation of AMPA receptors leading to excitotoxic injury
RATIONALE: Anti-NMDAR encephalitis involves IgG antibodies against the GluN1 subunit,
causing receptor crosslinking and internalization, which reduces NMDAR-mediated currents and
produces neuropsychiatric symptoms and seizures. Other options incorrectly implicate
GABAergic loss, potassium channels, or AMPA upregulation.
Q3 DIFFERENTIATE MOLECULAR MECHANISMS OF NEURONAL INJURY (EXCITOTOXICITY,
OXIDATIVE STRESS, PROTEIN MISFOLDING) AND MAP THEM TO DISEASE PHENOTYPES
Which finding best localizes a lesion to the medial longitudinal fasciculus (MLF)
rather than the abducens nucleus?
A. Impaired adduction of the ipsilateral eye with preserved convergence CORRECT
B. Impaired abduction of the ipsilateral eye with diplopia on lateral gaze
C. Downbeat nystagmus on upward gaze with vertigo
D. Bilateral ptosis with impaired upward gaze
RATIONALE: MLF lesions cause internuclear ophthalmoplegia: failure of adduction in the
ipsilateral eye with intact convergence, because the MLF carries signals from the abducens
internuclear neurons to the contralateral oculomotor nucleus. Abducens nuclear lesions cause
abduction deficit; other options reflect different brainstem/cerebellar sites.
Page 3
