, NR 507 Advanced Pathophysiology: Week 7
High-Yield Practice Questions, Answers, &
Rationales 2026/2027 Update - Central Nervous
System: Sensory & Motor Disorders (Alzheimer’s,
Parkinson’s, Seizures, and Increased ICP)
Question 1: Alzheimer's Disease Pathophysiology
Which pathophysiological mechanism is primarily
responsible for the formation of extracellular senile plaques
associated with Alzheimer's disease?
A. Hyperphosphorylation of intracellular tau proteins
leading to microtubule destabilization
B. Deposition and aggregation of misfolded beta-amyloid
proteins in the neural parenchyma
C. Autoimmune-mediated destruction of central cholinergic
neurons in the nucleus basalis of Meynert
D. Massive expansion of the cerebral ventricles secondary
to normal-pressure hydrocephalus
Correct Answer: B. Deposition and aggregation of misfolded
beta-amyloid proteins in the neural parenchyma
Rationale: Alzheimer’s disease is characterized pathologically
by two hallmark protein abnormalities: extracellular senile
plaques (formed by the accumulation of insoluble beta-amyloid
peptides) and intracellular neurofibrillary tangles (composed
of hyperphosphorylated tau proteins). The cleavage of amyloid
precursor protein (APP) by aberrant secretase activity yields
sticky beta-amyloid fragments that clump together, disrupting
,synaptic communication and inciting a localized inflammatory
response.
Question 2: Cholinergic Hypothesis & Pharmacotherapy
The cholinergic hypothesis of Alzheimer’s disease serves as
the foundational rationale for administering which class of
medications to manage cognitive decline?
Docsity
A. N-methyl-D-aspartate (NMDA) receptor antagonists
B. Dopamine receptor agonists
C. Acetylcholinesterase inhibitors
Docsity
D. Monoamine oxidase B (MAO-B) inhibitors
Correct Answer: C. Acetylcholinesterase inhibitors
Rationale: The brains of individuals with Alzheimer’s disease
exhibit a marked deficit in acetylcholine (ACh), a key
neurotransmitter vital for memory, learning, and synaptic
plasticity. Because acetylcholinesterase is the enzyme
responsible for degrading synaptic ACh, administering an
acetylcholinesterase inhibitor (e.g., donepezil) blocks this
breakdown, thereby increasing the availability of acetylcholine
within the synaptic cleft to temporarily sustain cognitive
function.
Question 3: Parkinson’s Disease Pathophysiology
, A patient presents with resting tremors, rigidity,
bradykinesia, and postural instability. Which core structural
brain pathology accounts for these manifestations in
Parkinson's disease?
A. Demyelination of upper motor neurons in the
corticospinal tracts
B. Degeneration of dopaminergic neurons in the substantia
nigra pars compacta
C. Infarction of the basal ganglia secondary to middle
cerebral artery occlusion
D. Accumulation of Lewy bodies composed of amyloid-
beta in the cerebral cortex
Correct Answer: B. Degeneration of dopaminergic neurons
in the substantia nigra pars compacta
Rationale: Parkinson's disease is a neurodegenerative disorder
driven by the progressive loss of dopamine-producing pigment
cells in the substantia nigra pars compacta, which projects to
the striatum. Dopamine is essential for modulating the basal
ganglia direct and indirect pathways to control smooth,
purposeful movement. The loss of this dopaminergic input leads
to unchecked inhibitory outflow from the internal globus
pallidus, manifesting as the classic triad of rigidity,
bradykinesia, and resting tremor.
Question 4: Seizure Pathophysiology
During a generalized tonic-clonic seizure, which cellular
event initiates the abrupt, synchronous, and high-frequency
depolarization characteristic of the ictal phase?
High-Yield Practice Questions, Answers, &
Rationales 2026/2027 Update - Central Nervous
System: Sensory & Motor Disorders (Alzheimer’s,
Parkinson’s, Seizures, and Increased ICP)
Question 1: Alzheimer's Disease Pathophysiology
Which pathophysiological mechanism is primarily
responsible for the formation of extracellular senile plaques
associated with Alzheimer's disease?
A. Hyperphosphorylation of intracellular tau proteins
leading to microtubule destabilization
B. Deposition and aggregation of misfolded beta-amyloid
proteins in the neural parenchyma
C. Autoimmune-mediated destruction of central cholinergic
neurons in the nucleus basalis of Meynert
D. Massive expansion of the cerebral ventricles secondary
to normal-pressure hydrocephalus
Correct Answer: B. Deposition and aggregation of misfolded
beta-amyloid proteins in the neural parenchyma
Rationale: Alzheimer’s disease is characterized pathologically
by two hallmark protein abnormalities: extracellular senile
plaques (formed by the accumulation of insoluble beta-amyloid
peptides) and intracellular neurofibrillary tangles (composed
of hyperphosphorylated tau proteins). The cleavage of amyloid
precursor protein (APP) by aberrant secretase activity yields
sticky beta-amyloid fragments that clump together, disrupting
,synaptic communication and inciting a localized inflammatory
response.
Question 2: Cholinergic Hypothesis & Pharmacotherapy
The cholinergic hypothesis of Alzheimer’s disease serves as
the foundational rationale for administering which class of
medications to manage cognitive decline?
Docsity
A. N-methyl-D-aspartate (NMDA) receptor antagonists
B. Dopamine receptor agonists
C. Acetylcholinesterase inhibitors
Docsity
D. Monoamine oxidase B (MAO-B) inhibitors
Correct Answer: C. Acetylcholinesterase inhibitors
Rationale: The brains of individuals with Alzheimer’s disease
exhibit a marked deficit in acetylcholine (ACh), a key
neurotransmitter vital for memory, learning, and synaptic
plasticity. Because acetylcholinesterase is the enzyme
responsible for degrading synaptic ACh, administering an
acetylcholinesterase inhibitor (e.g., donepezil) blocks this
breakdown, thereby increasing the availability of acetylcholine
within the synaptic cleft to temporarily sustain cognitive
function.
Question 3: Parkinson’s Disease Pathophysiology
, A patient presents with resting tremors, rigidity,
bradykinesia, and postural instability. Which core structural
brain pathology accounts for these manifestations in
Parkinson's disease?
A. Demyelination of upper motor neurons in the
corticospinal tracts
B. Degeneration of dopaminergic neurons in the substantia
nigra pars compacta
C. Infarction of the basal ganglia secondary to middle
cerebral artery occlusion
D. Accumulation of Lewy bodies composed of amyloid-
beta in the cerebral cortex
Correct Answer: B. Degeneration of dopaminergic neurons
in the substantia nigra pars compacta
Rationale: Parkinson's disease is a neurodegenerative disorder
driven by the progressive loss of dopamine-producing pigment
cells in the substantia nigra pars compacta, which projects to
the striatum. Dopamine is essential for modulating the basal
ganglia direct and indirect pathways to control smooth,
purposeful movement. The loss of this dopaminergic input leads
to unchecked inhibitory outflow from the internal globus
pallidus, manifesting as the classic triad of rigidity,
bradykinesia, and resting tremor.
Question 4: Seizure Pathophysiology
During a generalized tonic-clonic seizure, which cellular
event initiates the abrupt, synchronous, and high-frequency
depolarization characteristic of the ictal phase?
