NUR 634 Final Exam Actual Exam QUESTIONS
AND ANSWERS 2026 | Advanced
Pathophysiology | Complete Q&A Graded A+ |
Pass Guaranteed - A+ Graded
Question 1
A 62-year-old male with a 40 pack-year smoking history presents with a persistent productive
cough. Bronchoscopic biopsy reveals that normal ciliated pseudostratified columnar epithelium
has been replaced by stratified squamous epithelium with keratinization. This cellular adaptation
represents:
A. Dysplasia with loss of cellular organization
B. Metaplasia as a protective response to chronic irritation [CORRECT]
C. Hyperplasia with increased cell proliferation
D. Anaplasia indicating malignant transformation
Correct Answer: B
Rationale: Metaplasia is the reversible replacement of one mature differentiated cell type by
another mature cell type. In smokers, chronic irritation causes columnar epithelium to transform
to squamous epithelium (squamous metaplasia) as a protective adaptation. This is still reversible
if smoking ceases. Dysplasia (A) shows disordered cellular development with nuclear atypia.
Hyperplasia (C) involves increased cell numbers, not cell type change. Anaplasia (D) indicates
loss of differentiation in malignancy and is irreversible. While metaplasia can progress to
dysplasia and cancer, this biopsy shows classic metaplasia without atypia.
Question 2
A patient in hemorrhagic shock develops acute tubular necrosis. The primary intracellular
mechanism causing cell death in this hypoxic injury is:
A. Lysosomal enzyme activation causing autophagy
B. ATP depletion leading to failure of Na⁺/K⁺-ATPase pump and cellular swelling [CORRECT]
C. Activation of caspases triggering immediate apoptosis
D. Endoplasmic reticulum stress causing protein misfolding
,Correct Answer: B
Rationale: In hypoxic injury (ischemia), oxygen deprivation halts oxidative phosphorylation,
causing ATP depletion. Without ATP, the Na⁺/K⁺-ATPase pump fails, leading to intracellular Na⁺
and water accumulation (cellular swelling), Ca²⁺ influx, and eventual membrane rupture
(necrosis). This is the classic mechanism of ischemic cell injury. While autophagy (A) and ER
stress (D) occur, they are not the primary mechanism. Apoptosis (C) is energy-dependent and
typically doesn't occur in ischemia due to ATP depletion; necrosis is the predominant form of cell
death in ischemia.
Question 3
A patient with a myocardial infarction shows coagulative necrosis on biopsy. Which pathological
feature distinguishes coagulative necrosis from liquefactive necrosis?
A. Complete digestion of tissue architecture by hydrolytic enzymes
B. Preservation of cellular and tissue architecture for several days [CORRECT]
C. Formation of cheesy, granular debris
D. Conversion of tissue to a viscous liquid mass
Correct Answer: B
Rationale: Coagulative necrosis (typical of ischemia in solid organs like heart, kidney, spleen)
preserves cellular outlines and tissue architecture for days due to denaturation of structural
proteins and enzymes, preventing rapid lysis. Liquefactive necrosis (A, D) occurs when
hydrolytic enzymes completely digest tissue, forming liquid (seen in brain infarcts and bacterial
abscesses). Caseous necrosis (C) shows cheesy, granular debris characteristic of tuberculosis.
The architectural preservation in coagulative necrosis allows identification of tissue structure
histologically, unlike liquefactive necrosis where architecture is completely lost.
Question 4
A patient with systemic lupus erythematosus (SLE) develops diffuse alveolar hemorrhage.
Which immune mechanism is primarily responsible for this complication?
A. IgE-mediated mast cell degranulation causing bronchospasm
B. Immune complex deposition activating complement and neutrophil infiltration [CORRECT]
C. Cytotoxic T-cell mediated destruction of alveolar epithelium
D. Antibody-mediated activation of NK cells causing apoptosis
Correct Answer: B
,Rationale: SLE is a systemic autoimmune disease characterized by Type III hypersensitivity
(immune complex-mediated). In diffuse alveolar hemorrhage, immune complexes (anti-dsDNA,
other autoantibodies) deposit in alveolar capillaries, activate complement (C3a, C5a), recruit
neutrophils, and cause vasculitis and hemorrhage. Type I hypersensitivity (A) involves IgE and
mast cells (asthma, anaphylaxis). Type IV hypersensitivity (C) is T-cell mediated (contact
dermatitis, granuloma formation). Antibody-dependent cellular cytotoxicity (D) involves NK
cells but is not the primary mechanism in SLE lung disease.
Question 5
A patient experiences anaphylaxis within minutes of receiving intravenous penicillin. The rapid
systemic response is mediated predominantly by:
A. IgG antibodies activating the classical complement pathway
B. IgE bound to mast cells and basophils triggering degranulation [CORRECT]
C. IgM forming immune complexes in vascular endothelium
D. Sensitized T-cells releasing IFN-γ and TNF-α
Correct Answer: B
Rationale: Anaphylaxis is a Type I (immediate) hypersensitivity reaction. Penicillin acts as a
hapten, binding to proteins and triggering IgE production. Upon re-exposure, penicillin cross-
links IgE on mast cells and basophils, causing rapid degranulation of histamine, leukotrienes,
prostaglandins, and tryptase, leading to vasodilation, bronchospasm, and cardiovascular collapse
within minutes. IgG (A) and complement are involved in Type II/III reactions. IgM immune
complexes (C) cause Type III reactions (serum sickness). T-cells (D) mediate Type IV delayed
hypersensitivity (contact dermatitis).
Question 6
A patient with tuberculosis develops caseating granulomas in the lung. The central necrosis
appears "cheesy" due to:
A. Liquefaction by bacterial proteases
B. Hypersensitivity reaction to Mycobacterium tuberculosis antigens [CORRECT]
C. Direct cytotoxic effect of mycobacterial cell walls
D. Ischemic infarction of lung tissue
Correct Answer: B
Rationale: Caseous necrosis in TB results from a Type IV delayed hypersensitivity reaction to
mycobacterial antigens. Activated macrophages (epithelioid cells) and T-cells form granulomas,
, releasing cytokines (TNF-α, IFN-γ) and enzymes that cause central necrosis with a cheesy,
granular appearance. The necrosis is not due to bacterial proteases (A), direct cytotoxicity (C), or
ischemia (D). The granulomatous response attempts to contain the infection but causes tissue
destruction.
Question 7
A patient with chronic venous insufficiency develops a non-healing ulcer on the medial ankle.
Which factor most impairs wound healing in this scenario?
A. Excessive collagen deposition causing hypertrophic scarring
B. Chronic hypoxia and impaired nutrient delivery to tissues [CORRECT]
C. Hyperproliferation of fibroblasts with excessive granulation tissue
D. Increased angiogenesis causing fragile blood vessels
Correct Answer: B
Rationale: Chronic venous insufficiency causes venous hypertension, edema, and impaired
microcirculation, leading to tissue hypoxia and nutrient deficiency that impairs all phases of
wound healing (inflammation, proliferation, remodeling). Venous ulcers typically show delayed
healing due to poor perfusion. Options A, C, and D describe features not typical of venous ulcers.
Venous ulcers have poor granulation tissue formation due to hypoxia, not excessive fibroblast
proliferation.
Question 8
A patient receiving radiation therapy for breast cancer develops fatigue and skin changes in the
treatment field. The cellular injury from radiation is primarily caused by:
A. Thermal damage denaturing proteins
B. Ionization generating free radicals that damage DNA [CORRECT]
C. Direct mechanical disruption of cell membranes
D. Activation of lysosomal enzymes causing autolysis
Correct Answer: B
Rationale: Radiation causes cellular injury through ionization of water and other molecules,
generating free radicals (hydroxyl radicals, superoxide) that damage DNA, proteins, and lipids.
DNA double-strand breaks are particularly lethal. This is distinct from thermal injury (A),
mechanical damage (C), or enzymatic autolysis (D). The free radical damage explains both the
acute effects (skin changes, mucositis) and late effects (fibrosis, carcinogenesis) of radiation.
Question 9
AND ANSWERS 2026 | Advanced
Pathophysiology | Complete Q&A Graded A+ |
Pass Guaranteed - A+ Graded
Question 1
A 62-year-old male with a 40 pack-year smoking history presents with a persistent productive
cough. Bronchoscopic biopsy reveals that normal ciliated pseudostratified columnar epithelium
has been replaced by stratified squamous epithelium with keratinization. This cellular adaptation
represents:
A. Dysplasia with loss of cellular organization
B. Metaplasia as a protective response to chronic irritation [CORRECT]
C. Hyperplasia with increased cell proliferation
D. Anaplasia indicating malignant transformation
Correct Answer: B
Rationale: Metaplasia is the reversible replacement of one mature differentiated cell type by
another mature cell type. In smokers, chronic irritation causes columnar epithelium to transform
to squamous epithelium (squamous metaplasia) as a protective adaptation. This is still reversible
if smoking ceases. Dysplasia (A) shows disordered cellular development with nuclear atypia.
Hyperplasia (C) involves increased cell numbers, not cell type change. Anaplasia (D) indicates
loss of differentiation in malignancy and is irreversible. While metaplasia can progress to
dysplasia and cancer, this biopsy shows classic metaplasia without atypia.
Question 2
A patient in hemorrhagic shock develops acute tubular necrosis. The primary intracellular
mechanism causing cell death in this hypoxic injury is:
A. Lysosomal enzyme activation causing autophagy
B. ATP depletion leading to failure of Na⁺/K⁺-ATPase pump and cellular swelling [CORRECT]
C. Activation of caspases triggering immediate apoptosis
D. Endoplasmic reticulum stress causing protein misfolding
,Correct Answer: B
Rationale: In hypoxic injury (ischemia), oxygen deprivation halts oxidative phosphorylation,
causing ATP depletion. Without ATP, the Na⁺/K⁺-ATPase pump fails, leading to intracellular Na⁺
and water accumulation (cellular swelling), Ca²⁺ influx, and eventual membrane rupture
(necrosis). This is the classic mechanism of ischemic cell injury. While autophagy (A) and ER
stress (D) occur, they are not the primary mechanism. Apoptosis (C) is energy-dependent and
typically doesn't occur in ischemia due to ATP depletion; necrosis is the predominant form of cell
death in ischemia.
Question 3
A patient with a myocardial infarction shows coagulative necrosis on biopsy. Which pathological
feature distinguishes coagulative necrosis from liquefactive necrosis?
A. Complete digestion of tissue architecture by hydrolytic enzymes
B. Preservation of cellular and tissue architecture for several days [CORRECT]
C. Formation of cheesy, granular debris
D. Conversion of tissue to a viscous liquid mass
Correct Answer: B
Rationale: Coagulative necrosis (typical of ischemia in solid organs like heart, kidney, spleen)
preserves cellular outlines and tissue architecture for days due to denaturation of structural
proteins and enzymes, preventing rapid lysis. Liquefactive necrosis (A, D) occurs when
hydrolytic enzymes completely digest tissue, forming liquid (seen in brain infarcts and bacterial
abscesses). Caseous necrosis (C) shows cheesy, granular debris characteristic of tuberculosis.
The architectural preservation in coagulative necrosis allows identification of tissue structure
histologically, unlike liquefactive necrosis where architecture is completely lost.
Question 4
A patient with systemic lupus erythematosus (SLE) develops diffuse alveolar hemorrhage.
Which immune mechanism is primarily responsible for this complication?
A. IgE-mediated mast cell degranulation causing bronchospasm
B. Immune complex deposition activating complement and neutrophil infiltration [CORRECT]
C. Cytotoxic T-cell mediated destruction of alveolar epithelium
D. Antibody-mediated activation of NK cells causing apoptosis
Correct Answer: B
,Rationale: SLE is a systemic autoimmune disease characterized by Type III hypersensitivity
(immune complex-mediated). In diffuse alveolar hemorrhage, immune complexes (anti-dsDNA,
other autoantibodies) deposit in alveolar capillaries, activate complement (C3a, C5a), recruit
neutrophils, and cause vasculitis and hemorrhage. Type I hypersensitivity (A) involves IgE and
mast cells (asthma, anaphylaxis). Type IV hypersensitivity (C) is T-cell mediated (contact
dermatitis, granuloma formation). Antibody-dependent cellular cytotoxicity (D) involves NK
cells but is not the primary mechanism in SLE lung disease.
Question 5
A patient experiences anaphylaxis within minutes of receiving intravenous penicillin. The rapid
systemic response is mediated predominantly by:
A. IgG antibodies activating the classical complement pathway
B. IgE bound to mast cells and basophils triggering degranulation [CORRECT]
C. IgM forming immune complexes in vascular endothelium
D. Sensitized T-cells releasing IFN-γ and TNF-α
Correct Answer: B
Rationale: Anaphylaxis is a Type I (immediate) hypersensitivity reaction. Penicillin acts as a
hapten, binding to proteins and triggering IgE production. Upon re-exposure, penicillin cross-
links IgE on mast cells and basophils, causing rapid degranulation of histamine, leukotrienes,
prostaglandins, and tryptase, leading to vasodilation, bronchospasm, and cardiovascular collapse
within minutes. IgG (A) and complement are involved in Type II/III reactions. IgM immune
complexes (C) cause Type III reactions (serum sickness). T-cells (D) mediate Type IV delayed
hypersensitivity (contact dermatitis).
Question 6
A patient with tuberculosis develops caseating granulomas in the lung. The central necrosis
appears "cheesy" due to:
A. Liquefaction by bacterial proteases
B. Hypersensitivity reaction to Mycobacterium tuberculosis antigens [CORRECT]
C. Direct cytotoxic effect of mycobacterial cell walls
D. Ischemic infarction of lung tissue
Correct Answer: B
Rationale: Caseous necrosis in TB results from a Type IV delayed hypersensitivity reaction to
mycobacterial antigens. Activated macrophages (epithelioid cells) and T-cells form granulomas,
, releasing cytokines (TNF-α, IFN-γ) and enzymes that cause central necrosis with a cheesy,
granular appearance. The necrosis is not due to bacterial proteases (A), direct cytotoxicity (C), or
ischemia (D). The granulomatous response attempts to contain the infection but causes tissue
destruction.
Question 7
A patient with chronic venous insufficiency develops a non-healing ulcer on the medial ankle.
Which factor most impairs wound healing in this scenario?
A. Excessive collagen deposition causing hypertrophic scarring
B. Chronic hypoxia and impaired nutrient delivery to tissues [CORRECT]
C. Hyperproliferation of fibroblasts with excessive granulation tissue
D. Increased angiogenesis causing fragile blood vessels
Correct Answer: B
Rationale: Chronic venous insufficiency causes venous hypertension, edema, and impaired
microcirculation, leading to tissue hypoxia and nutrient deficiency that impairs all phases of
wound healing (inflammation, proliferation, remodeling). Venous ulcers typically show delayed
healing due to poor perfusion. Options A, C, and D describe features not typical of venous ulcers.
Venous ulcers have poor granulation tissue formation due to hypoxia, not excessive fibroblast
proliferation.
Question 8
A patient receiving radiation therapy for breast cancer develops fatigue and skin changes in the
treatment field. The cellular injury from radiation is primarily caused by:
A. Thermal damage denaturing proteins
B. Ionization generating free radicals that damage DNA [CORRECT]
C. Direct mechanical disruption of cell membranes
D. Activation of lysosomal enzymes causing autolysis
Correct Answer: B
Rationale: Radiation causes cellular injury through ionization of water and other molecules,
generating free radicals (hydroxyl radicals, superoxide) that damage DNA, proteins, and lipids.
DNA double-strand breaks are particularly lethal. This is distinct from thermal injury (A),
mechanical damage (C), or enzymatic autolysis (D). The free radical damage explains both the
acute effects (skin changes, mucositis) and late effects (fibrosis, carcinogenesis) of radiation.
Question 9
