NUR 502 Exam 4: Advanced Pathophysiology -
St. Thomas University Updated and Latest
Questions and Correct Answers with Rationale
1. Which pathophysiological process is characteristic of Multiple Sclerosis (MS)?
A. Degeneration of the lower motor neurons in the spinal cord.
B. Accumulation of amyloid plaques and neurofibrillary tangles in the cortex.
C. Depletion of dopamine in the substantia nigra of the basal ganglia.
D. Demyelination of the central nervous system axons mediated by an immune response.
Correct Answer: D
Rationale: Multiple sclerosis involves an autoimmune attack against the myelin sheaths
surrounding nerve fibers in the brain and spinal cord. This process results in the formation
of plaques or lesions that disrupt nerve signal transmission. Over time, the repeated
inflammatory attacks can lead to permanent axonal damage and neurological deficits.
Symptoms vary widely depending on the location of the lesions within the central nervous
system. Early diagnosis is essential to implement therapies that reduce the frequency of
clinical relapses.
2. A patient with Pernicious Anemia is deficient in intrinsic factor, which is necessary for the
absorption of which nutrient?
A. Iron
B. Folic acid
C. Vitamin C
D. Vitamin B12
Correct Answer: D
Rationale: Pernicious anemia is caused by a lack of intrinsic factor produced by the gastric
parietal cells. Intrinsic factor is required for the ileal absorption of Vitamin B12 from the
diet. Without sufficient Vitamin B12, DNA synthesis in red blood cells is impaired, leading
to megaloblastic changes. Patients often present with neurological symptoms such as
paresthesias due to myelin sheath instability. Treatment typically involves life-long Vitamin
B12 injections to bypass the digestive tract absorption issue.
3. What is the primary pathological change seen in the joints of a patient with Rheumatoid
Arthritis?
A. Formation of a pannus that invades and destroys the joint space.
B. Degeneration of articular cartilage due to mechanical wear and tear.
,C. Crystallization of uric acid within the synovial fluid.
D. Excessive bone formation at the joint margins known as osteophytes.
Correct Answer: A
Rationale: Rheumatoid arthritis is a systemic autoimmune disease characterized by
chronic inflammation of the synovium. The inflammatory process leads to the formation of
a pannus, which is a layer of vascular fibrous tissue. This pannus invades the cartilage and
eventually leads to bone erosion and joint deformity. Unlike osteoarthritis, the damage in
RA is driven by immune mediators such as cytokines and autoantibodies. Management
focuses on suppressing the immune response to prevent irreversible joint destruction.
4. Parkinson’s disease is primarily associated with the deficiency of which neurotransmitter?
A. Dopamine
B. Serotonin
C. Acetylcholine
D. GABA
Correct Answer: A
Rationale: Parkinson’s disease results from the progressive loss of dopaminergic neurons
in the substantia nigra. Dopamine is a critical neurotransmitter for regulating smooth and
coordinated muscle movements. The lack of dopamine leads to the classic triad of tremors,
bradykinesia, and muscle rigidity. Lewy bodies, which are abnormal protein aggregates, are
also a hallmark finding in the affected neurons. Pharmacological treatments usually aim to
increase dopamine levels or mimic its effects in the brain.
5. Which condition is a microcytic-hypochromic anemia often caused by chronic blood loss?
A. Sickle cell anemia
B. Aplastic anemia
C. Iron deficiency anemia
D. Hemolytic anemia
Correct Answer: C
Rationale: Iron deficiency anemia is the most common form of nutritional deficiency
anemia worldwide. It results in red blood cells that are smaller than normal and pale in
color due to low hemoglobin content. In adults, especially males and postmenopausal
females, chronic occult gastrointestinal bleeding is a primary cause. The body requires iron
to synthesize the heme portion of the hemoglobin molecule. Diagnostic labs typically show
low serum ferritin and elevated total iron-binding capacity.
, 6. In the pathophysiology of Osteoarthritis, what is the initial event in joint degradation?
A. Autoimmune destruction of the synovial membrane.
B. Infection of the bone marrow by Staphylococcus aureus.
C. Erosion of the articular cartilage due to enzymatic breakdown.
D. Loss of bone density leading to micro-fractures.
Correct Answer: C
Rationale: Osteoarthritis is primarily a disease of the articular cartilage rather than a
systemic inflammatory condition. It begins with the loss of proteoglycans and collagen in
the cartilage matrix, often due to mechanical stress. As the cartilage thins, the underlying
bone is exposed and undergoes thickening or sclerosis. This process results in the
formation of bone spurs, also known as osteophytes, at the joint margins. Pain typically
worsens with activity and improves with rest in the early stages.
7. Which mechanism describes the cause of Myasthenia Gravis?
A. Degeneration of the myelin sheath in the peripheral nervous system.
B. Genetic mutation causing the absence of the protein dystrophin.
C. Excessive release of acetylcholine causing muscle tetany.
D. Antibodies blocking or destroying acetylcholine receptors at the neuromuscular
junction.
Correct Answer: D
Rationale: Myasthenia Gravis is an autoimmune disorder where antibodies target the
nicotinic acetylcholine receptors on the postsynaptic membrane. This blockade results in a
failure of nerve impulse transmission to the muscle fibers. The hallmark symptom is
muscle weakness that fluctuates and worsens with repetitive use. Many patients also
exhibit thymic hyperplasia or thymoma, suggesting a role for the thymus in disease
pathogenesis. Treatment involves acetylcholinesterase inhibitors to increase the
availability of acetylcholine at the junction.
8. Disseminated Intravascular Coagulation (DIC) is characterized by which paradoxical clinical
state?
A. Simultaneous widespread clotting and severe bleeding.
B. Excessive erythropoiesis and low plasma volume.
C. High platelet counts with impaired fibrinogen synthesis.
D. Isolated venous thrombosis in the lower extremities.
Correct Answer: A
St. Thomas University Updated and Latest
Questions and Correct Answers with Rationale
1. Which pathophysiological process is characteristic of Multiple Sclerosis (MS)?
A. Degeneration of the lower motor neurons in the spinal cord.
B. Accumulation of amyloid plaques and neurofibrillary tangles in the cortex.
C. Depletion of dopamine in the substantia nigra of the basal ganglia.
D. Demyelination of the central nervous system axons mediated by an immune response.
Correct Answer: D
Rationale: Multiple sclerosis involves an autoimmune attack against the myelin sheaths
surrounding nerve fibers in the brain and spinal cord. This process results in the formation
of plaques or lesions that disrupt nerve signal transmission. Over time, the repeated
inflammatory attacks can lead to permanent axonal damage and neurological deficits.
Symptoms vary widely depending on the location of the lesions within the central nervous
system. Early diagnosis is essential to implement therapies that reduce the frequency of
clinical relapses.
2. A patient with Pernicious Anemia is deficient in intrinsic factor, which is necessary for the
absorption of which nutrient?
A. Iron
B. Folic acid
C. Vitamin C
D. Vitamin B12
Correct Answer: D
Rationale: Pernicious anemia is caused by a lack of intrinsic factor produced by the gastric
parietal cells. Intrinsic factor is required for the ileal absorption of Vitamin B12 from the
diet. Without sufficient Vitamin B12, DNA synthesis in red blood cells is impaired, leading
to megaloblastic changes. Patients often present with neurological symptoms such as
paresthesias due to myelin sheath instability. Treatment typically involves life-long Vitamin
B12 injections to bypass the digestive tract absorption issue.
3. What is the primary pathological change seen in the joints of a patient with Rheumatoid
Arthritis?
A. Formation of a pannus that invades and destroys the joint space.
B. Degeneration of articular cartilage due to mechanical wear and tear.
,C. Crystallization of uric acid within the synovial fluid.
D. Excessive bone formation at the joint margins known as osteophytes.
Correct Answer: A
Rationale: Rheumatoid arthritis is a systemic autoimmune disease characterized by
chronic inflammation of the synovium. The inflammatory process leads to the formation of
a pannus, which is a layer of vascular fibrous tissue. This pannus invades the cartilage and
eventually leads to bone erosion and joint deformity. Unlike osteoarthritis, the damage in
RA is driven by immune mediators such as cytokines and autoantibodies. Management
focuses on suppressing the immune response to prevent irreversible joint destruction.
4. Parkinson’s disease is primarily associated with the deficiency of which neurotransmitter?
A. Dopamine
B. Serotonin
C. Acetylcholine
D. GABA
Correct Answer: A
Rationale: Parkinson’s disease results from the progressive loss of dopaminergic neurons
in the substantia nigra. Dopamine is a critical neurotransmitter for regulating smooth and
coordinated muscle movements. The lack of dopamine leads to the classic triad of tremors,
bradykinesia, and muscle rigidity. Lewy bodies, which are abnormal protein aggregates, are
also a hallmark finding in the affected neurons. Pharmacological treatments usually aim to
increase dopamine levels or mimic its effects in the brain.
5. Which condition is a microcytic-hypochromic anemia often caused by chronic blood loss?
A. Sickle cell anemia
B. Aplastic anemia
C. Iron deficiency anemia
D. Hemolytic anemia
Correct Answer: C
Rationale: Iron deficiency anemia is the most common form of nutritional deficiency
anemia worldwide. It results in red blood cells that are smaller than normal and pale in
color due to low hemoglobin content. In adults, especially males and postmenopausal
females, chronic occult gastrointestinal bleeding is a primary cause. The body requires iron
to synthesize the heme portion of the hemoglobin molecule. Diagnostic labs typically show
low serum ferritin and elevated total iron-binding capacity.
, 6. In the pathophysiology of Osteoarthritis, what is the initial event in joint degradation?
A. Autoimmune destruction of the synovial membrane.
B. Infection of the bone marrow by Staphylococcus aureus.
C. Erosion of the articular cartilage due to enzymatic breakdown.
D. Loss of bone density leading to micro-fractures.
Correct Answer: C
Rationale: Osteoarthritis is primarily a disease of the articular cartilage rather than a
systemic inflammatory condition. It begins with the loss of proteoglycans and collagen in
the cartilage matrix, often due to mechanical stress. As the cartilage thins, the underlying
bone is exposed and undergoes thickening or sclerosis. This process results in the
formation of bone spurs, also known as osteophytes, at the joint margins. Pain typically
worsens with activity and improves with rest in the early stages.
7. Which mechanism describes the cause of Myasthenia Gravis?
A. Degeneration of the myelin sheath in the peripheral nervous system.
B. Genetic mutation causing the absence of the protein dystrophin.
C. Excessive release of acetylcholine causing muscle tetany.
D. Antibodies blocking or destroying acetylcholine receptors at the neuromuscular
junction.
Correct Answer: D
Rationale: Myasthenia Gravis is an autoimmune disorder where antibodies target the
nicotinic acetylcholine receptors on the postsynaptic membrane. This blockade results in a
failure of nerve impulse transmission to the muscle fibers. The hallmark symptom is
muscle weakness that fluctuates and worsens with repetitive use. Many patients also
exhibit thymic hyperplasia or thymoma, suggesting a role for the thymus in disease
pathogenesis. Treatment involves acetylcholinesterase inhibitors to increase the
availability of acetylcholine at the junction.
8. Disseminated Intravascular Coagulation (DIC) is characterized by which paradoxical clinical
state?
A. Simultaneous widespread clotting and severe bleeding.
B. Excessive erythropoiesis and low plasma volume.
C. High platelet counts with impaired fibrinogen synthesis.
D. Isolated venous thrombosis in the lower extremities.
Correct Answer: A
