ADVANCED PATHOPHYSIOLOGY
EXAM 3 QUESTIONS AND ANSWERS
AND EXPLANATIONS | LATEST - REGIS
1. Which neurotransmitter deficiency is primarily associated with the motor symptoms of
Parkinson’s disease?
A. Serotonin
B. Dopamine
C. Acetylcholine
D. Gamma-aminobutyric acid (GABA)
Answer: B
Conceptual Explanation: Parkinson’s disease is characterized by the degeneration of
dopaminergic neurons in the substantia nigra pars compacta, leading to a deficiency of
dopamine in the basal ganglia.
2. In the pathophysiology of Alzheimer’s disease, what does the ‘amyloid cascade hypothesis’
suggest?
A. Accumulation of beta-amyloid plaques triggers neurotoxicity and tau phosphorylation
B. Excessive calcium influx causes neuronal death
C. Demyelination of axons leads to cognitive decline
,D. Hyperphosphorylation of tau proteins is the primary event
Answer: A
Conceptual Explanation: The amyloid cascade hypothesis posits that the deposition of
amyloid-beta peptides is the critical initial event that leads to the formation of
neurofibrillary tangles and neuronal death.
3. A patient with a spinal cord injury at T6 experiences a sudden, severe headache, blurred
vision, and a blood pressure of 200/110 mmHg. What is the most likely condition?
A. Neurogenic shock
B. Spinal shock
C. Autonomic dysreflexia
D. Cerebral aneurysm rupture
Answer: C
Conceptual Explanation: Autonomic dysreflexia occurs in injuries at T6 or above,
triggered by noxious stimuli below the injury level, leading to uncompensated sympathetic
discharge and severe hypertension.
4. Which mechanism describes the development of Multiple Sclerosis?
A. Autoimmune destruction of the neuromuscular junction
B. Genetic mutation of the SOD1 enzyme
C. Ischemic damage to the white matter tracts
, D. T-cell mediated autoimmune attack on CNS myelin
Answer: D
Conceptual Explanation: Multiple Sclerosis is a chronic inflammatory disease where T-
cells and B-cells cross the blood-brain barrier to attack the myelin sheath of the central
nervous system.
5. According to the Monro-Kellie hypothesis, what happens if the volume of one intracranial
component increases?
A. The blood pressure must increase to maintain perfusion
B. The volume of other components must decrease to maintain constant pressure
C. The skull expands to accommodate the volume
D. Cerebrospinal fluid production increases to buffer the pressure
Answer: B
Conceptual Explanation: The Monro-Kellie hypothesis states that the sum of volumes of
brain, CSF, and intracranial blood is constant; an increase in one must be offset by a
decrease in others or ICP will rise.
6. What is the primary pathophysiological defect in Myasthenia Gravis?
A. Destruction of anterior horn cells
B. Degeneration of upper and lower motor neurons
C. Antibody-mediated destruction of acetylcholine receptors at the neuromuscular junction
EXAM 3 QUESTIONS AND ANSWERS
AND EXPLANATIONS | LATEST - REGIS
1. Which neurotransmitter deficiency is primarily associated with the motor symptoms of
Parkinson’s disease?
A. Serotonin
B. Dopamine
C. Acetylcholine
D. Gamma-aminobutyric acid (GABA)
Answer: B
Conceptual Explanation: Parkinson’s disease is characterized by the degeneration of
dopaminergic neurons in the substantia nigra pars compacta, leading to a deficiency of
dopamine in the basal ganglia.
2. In the pathophysiology of Alzheimer’s disease, what does the ‘amyloid cascade hypothesis’
suggest?
A. Accumulation of beta-amyloid plaques triggers neurotoxicity and tau phosphorylation
B. Excessive calcium influx causes neuronal death
C. Demyelination of axons leads to cognitive decline
,D. Hyperphosphorylation of tau proteins is the primary event
Answer: A
Conceptual Explanation: The amyloid cascade hypothesis posits that the deposition of
amyloid-beta peptides is the critical initial event that leads to the formation of
neurofibrillary tangles and neuronal death.
3. A patient with a spinal cord injury at T6 experiences a sudden, severe headache, blurred
vision, and a blood pressure of 200/110 mmHg. What is the most likely condition?
A. Neurogenic shock
B. Spinal shock
C. Autonomic dysreflexia
D. Cerebral aneurysm rupture
Answer: C
Conceptual Explanation: Autonomic dysreflexia occurs in injuries at T6 or above,
triggered by noxious stimuli below the injury level, leading to uncompensated sympathetic
discharge and severe hypertension.
4. Which mechanism describes the development of Multiple Sclerosis?
A. Autoimmune destruction of the neuromuscular junction
B. Genetic mutation of the SOD1 enzyme
C. Ischemic damage to the white matter tracts
, D. T-cell mediated autoimmune attack on CNS myelin
Answer: D
Conceptual Explanation: Multiple Sclerosis is a chronic inflammatory disease where T-
cells and B-cells cross the blood-brain barrier to attack the myelin sheath of the central
nervous system.
5. According to the Monro-Kellie hypothesis, what happens if the volume of one intracranial
component increases?
A. The blood pressure must increase to maintain perfusion
B. The volume of other components must decrease to maintain constant pressure
C. The skull expands to accommodate the volume
D. Cerebrospinal fluid production increases to buffer the pressure
Answer: B
Conceptual Explanation: The Monro-Kellie hypothesis states that the sum of volumes of
brain, CSF, and intracranial blood is constant; an increase in one must be offset by a
decrease in others or ICP will rise.
6. What is the primary pathophysiological defect in Myasthenia Gravis?
A. Destruction of anterior horn cells
B. Degeneration of upper and lower motor neurons
C. Antibody-mediated destruction of acetylcholine receptors at the neuromuscular junction
