,NSG5003/NSG 5003 Advanced Pathophysiology
Week 10 Knowledge Checks | South University | 26/27
(PDF)
1. A 55-year-old patient with chronic hypertension develops left ventricular hypertrophy. Which
cellular adaptation primarily drives this change?
A) Increased apoptosis
B) Mechanical stretch and angiotensin II signaling leading to increased protein synthesis in
cardiomyocytes
C) Decreased ATP production
D) Metaplasia of cardiac myocytes into fibroblasts
Correct Answer: Mechanical stretch and angiotensin II signaling leading to increased protein synthesis
in cardiomyocytes
Rationale: Sustained pressure overload causes cardiomyocyte hypertrophy via mechanotransduction
and neurohormonal activation, increasing contractile protein synthesis. Apoptosis, decreased ATP
production, and metaplasia are distinct processes not responsible for compensatory hypertrophy.
Understanding this mechanism is essential for managing hypertensive heart disease.
2. Which finding is a hallmark of irreversible cell injury?
A) Cellular swelling
B) Detachment of ribosomes
C) Mitochondrial calcium influx and loss of mitochondrial membrane potential
D) Decreased glycogen stores
Correct Answer: Mitochondrial calcium influx and loss of mitochondrial membrane potential
Rationale: Irreversible injury is characterized by mitochondrial permeability transition, calcium
overload, and loss of oxidative phosphorylation, leading to cell death. Cellular swelling, ribosomal
detachment, and glycogen depletion are reversible changes. Recognizing irreversible injury guides
prognostication in ischemic and toxic injuries.
,3. A 4-year-old child with recurrent infections and failure to thrive is diagnosed with severe combined
immunodeficiency. Which defect underlies this condition?
A) B-cell deficiency only
B) Defective phagocyte function
C) Deficiency of both T-cell and B-cell immunity due to mutations in adenosine deaminase or cytokine
receptor genes
D) Overproduction of IgE
Correct Answer: Deficiency of both T-cell and B-cell immunity due to mutations in adenosine
deaminase or cytokine receptor genes
Rationale: SCID results from impaired development of both T and B lymphocytes, often due to
adenosine deaminase deficiency or cytokine receptor mutations. Isolated B-cell deficiency, phagocyte
defects, and IgE overproduction cause different immunodeficiency syndromes. Early recognition is
critical for curative hematopoietic stem cell transplantation.
4. A 62-year-old man with a 40-pack-year smoking history presents with weight loss, hemoptysis, and
a persistent cough. Which pathophysiologic mechanism best explains his symptoms?
A) Chronic inflammation and metaplasia progressing to dysplasia
B) Autoimmune destruction of alveolar walls
C) IgE-mediated bronchoconstriction
D) Alpha-1 antitrypsin deficiency
Correct Answer: Chronic inflammation and metaplasia progressing to dysplasia
Rationale: Chronic smoking causes inflammation, metaplasia, and dysplasia that can progress to
bronchogenic carcinoma, presenting with hemoptysis, weight loss, and persistent cough. Autoimmune
alveolar destruction causes emphysema, IgE-mediated bronchoconstriction causes asthma, and alpha-
1 antitrypsin deficiency causes early-onset emphysema. Recognizing this progression aids timely
diagnosis.
5. Which immunoglobulin is primarily responsible for mediating type I hypersensitivity reactions?
, A) IgA
B) IgG
C) IgM
D) IgE
Correct Answer: IgE
Rationale: IgE binds to mast cells and basophils, and cross-linking by antigen triggers degranulation
and release of histamine and other mediators. IgA protects mucosal surfaces, IgG is involved in type II
and III reactions, and IgM is the first antibody produced. Identifying IgE is fundamental to allergy
pathophysiology.
6. A 28-year-old woman presents with fatigue, joint pain, and a malar rash. Which autoantibody is
most specific for systemic lupus erythematosus?
A) Rheumatoid factor
B) Anti-nuclear antibody
C) Anti-double-stranded DNA
D) Anti-histone antibody
Correct Answer: Anti-double-stranded DNA
Rationale: Anti-double-stranded DNA is highly specific for SLE and correlates with lupus nephritis.
Rheumatoid factor is associated with rheumatoid arthritis, anti-nuclear antibody is sensitive but less
specific, and anti-histone antibody is associated with drug-induced lupus. Recognizing specific
autoantibodies aids diagnosis and monitoring.
7. A patient with cirrhosis develops bleeding esophageal varices. Which mechanism explains this
complication?
A) Decreased production of clotting factors
B) Portal hypertension causing collateral vessel dilation
C) Splenic sequestration of platelets
D) Impaired vitamin K absorption
Week 10 Knowledge Checks | South University | 26/27
(PDF)
1. A 55-year-old patient with chronic hypertension develops left ventricular hypertrophy. Which
cellular adaptation primarily drives this change?
A) Increased apoptosis
B) Mechanical stretch and angiotensin II signaling leading to increased protein synthesis in
cardiomyocytes
C) Decreased ATP production
D) Metaplasia of cardiac myocytes into fibroblasts
Correct Answer: Mechanical stretch and angiotensin II signaling leading to increased protein synthesis
in cardiomyocytes
Rationale: Sustained pressure overload causes cardiomyocyte hypertrophy via mechanotransduction
and neurohormonal activation, increasing contractile protein synthesis. Apoptosis, decreased ATP
production, and metaplasia are distinct processes not responsible for compensatory hypertrophy.
Understanding this mechanism is essential for managing hypertensive heart disease.
2. Which finding is a hallmark of irreversible cell injury?
A) Cellular swelling
B) Detachment of ribosomes
C) Mitochondrial calcium influx and loss of mitochondrial membrane potential
D) Decreased glycogen stores
Correct Answer: Mitochondrial calcium influx and loss of mitochondrial membrane potential
Rationale: Irreversible injury is characterized by mitochondrial permeability transition, calcium
overload, and loss of oxidative phosphorylation, leading to cell death. Cellular swelling, ribosomal
detachment, and glycogen depletion are reversible changes. Recognizing irreversible injury guides
prognostication in ischemic and toxic injuries.
,3. A 4-year-old child with recurrent infections and failure to thrive is diagnosed with severe combined
immunodeficiency. Which defect underlies this condition?
A) B-cell deficiency only
B) Defective phagocyte function
C) Deficiency of both T-cell and B-cell immunity due to mutations in adenosine deaminase or cytokine
receptor genes
D) Overproduction of IgE
Correct Answer: Deficiency of both T-cell and B-cell immunity due to mutations in adenosine
deaminase or cytokine receptor genes
Rationale: SCID results from impaired development of both T and B lymphocytes, often due to
adenosine deaminase deficiency or cytokine receptor mutations. Isolated B-cell deficiency, phagocyte
defects, and IgE overproduction cause different immunodeficiency syndromes. Early recognition is
critical for curative hematopoietic stem cell transplantation.
4. A 62-year-old man with a 40-pack-year smoking history presents with weight loss, hemoptysis, and
a persistent cough. Which pathophysiologic mechanism best explains his symptoms?
A) Chronic inflammation and metaplasia progressing to dysplasia
B) Autoimmune destruction of alveolar walls
C) IgE-mediated bronchoconstriction
D) Alpha-1 antitrypsin deficiency
Correct Answer: Chronic inflammation and metaplasia progressing to dysplasia
Rationale: Chronic smoking causes inflammation, metaplasia, and dysplasia that can progress to
bronchogenic carcinoma, presenting with hemoptysis, weight loss, and persistent cough. Autoimmune
alveolar destruction causes emphysema, IgE-mediated bronchoconstriction causes asthma, and alpha-
1 antitrypsin deficiency causes early-onset emphysema. Recognizing this progression aids timely
diagnosis.
5. Which immunoglobulin is primarily responsible for mediating type I hypersensitivity reactions?
, A) IgA
B) IgG
C) IgM
D) IgE
Correct Answer: IgE
Rationale: IgE binds to mast cells and basophils, and cross-linking by antigen triggers degranulation
and release of histamine and other mediators. IgA protects mucosal surfaces, IgG is involved in type II
and III reactions, and IgM is the first antibody produced. Identifying IgE is fundamental to allergy
pathophysiology.
6. A 28-year-old woman presents with fatigue, joint pain, and a malar rash. Which autoantibody is
most specific for systemic lupus erythematosus?
A) Rheumatoid factor
B) Anti-nuclear antibody
C) Anti-double-stranded DNA
D) Anti-histone antibody
Correct Answer: Anti-double-stranded DNA
Rationale: Anti-double-stranded DNA is highly specific for SLE and correlates with lupus nephritis.
Rheumatoid factor is associated with rheumatoid arthritis, anti-nuclear antibody is sensitive but less
specific, and anti-histone antibody is associated with drug-induced lupus. Recognizing specific
autoantibodies aids diagnosis and monitoring.
7. A patient with cirrhosis develops bleeding esophageal varices. Which mechanism explains this
complication?
A) Decreased production of clotting factors
B) Portal hypertension causing collateral vessel dilation
C) Splenic sequestration of platelets
D) Impaired vitamin K absorption
