NSG 5140 ADVANCED PATHOPHYSIOLOGY
|Comprehensive Questions & Answers with
Rationales | 2026 Update
1. Which of the following is the primary mechanism of cellular injury in
hypoxic conditions?
A. DNA mutation
B. ATP depletion leading to loss of ion homeostasis
C. Free radical formation
D. Protein misfolding
Correct Answer: B
Rationale: Hypoxia impairs oxidative phosphorylation, leading to decreased
ATP production. The Na+/K+ ATPase pump requires ATP to maintain ion
gradients; failure of this pump causes intracellular sodium accumulation,
water influx, and cellular swelling. This is the hallmark of hypoxic cellular
injury.
2. A researcher studying pressure overload in cardiac myocytes
observes that sustained mechanical stretch leads to increased protein
synthesis and cell enlargement without cell division. Which
intracellular signaling pathway is most directly responsible for this
adaptive response?
A. Activation of the PI3K/Akt/mTOR pathway leading to increased
translation
B. Induction of p53-mediated cell cycle arrest and senescence
C. Upregulation of caspases and initiation of apoptosis
D. Activation of the unfolded protein response (UPR) due to ER stress
,Correct Answer: A
Rationale: Cardiac myocytes respond to increased workload by undergoing
hypertrophy, driven by the PI3K/Akt/mTOR pathway that enhances protein
synthesis. p53 activation would promote apoptosis or senescence, not
hypertrophy.
3. A chronic smoker develops emphysema. The underlying molecular
defect primarily involves:
A. Alpha-1 antitrypsin deficiency leading to elastase-mediated alveolar
destruction
B. Overproduction of mucus with squamous metaplasia
C. Bronchospasm and airway hyperreactivity
D. Alveolar wall fibrosis and scarring
Correct Answer: A
Rationale: Emphysema is characterized by permanent enlargement of
airspaces distal to terminal bronchioles. In smokers, an imbalance between
proteases (elastase) and antiproteases (alpha-1 antitrypsin) leads to alveolar
wall destruction. This is the basis of the protease-antiprotease theory.
4. A patient with chronic kidney disease develops anemia. The most
likely underlying mechanism is:
A. Iron deficiency due to poor dietary intake
B. Decreased erythropoietin production by damaged kidney tissue
C. Bone marrow suppression
D. Increased RBC destruction
Correct Answer: B
Rationale: Erythropoietin (EPO) is produced by peritubular fibroblasts in the
,kidney. Chronic kidney disease leads to reduced EPO production, resulting in
normocytic, normochromic anemia.
5. A patient with left-sided heart failure develops pulmonary edema.
The primary pathophysiologic mechanism is:
A. Increased capillary permeability due to inflammatory mediators
B. Increased hydrostatic pressure in pulmonary capillaries
C. Decreased plasma oncotic pressure
D. Lymphatic obstruction in the lungs
Correct Answer: B
Rationale: Left-sided heart failure causes increased left ventricular end-
diastolic pressure, leading to increased hydrostatic pressure in the pulmonary
capillaries. This forces fluid into the interstitial and alveolar spaces, causing
pulmonary edema.
6. A patient with sepsis develops disseminated intravascular
coagulation (DIC). The underlying mechanism involves:
A. Platelet hyperaggregation leading to microvascular thrombosis
B. Systemic activation of coagulation cascade with widespread
microvascular thrombosis and depletion of clotting factors
C. Heparin-induced thrombocytopenia
D. Vitamin K deficiency
Correct Answer: B
Rationale: DIC is characterized by widespread activation of the coagulation
cascade, leading to microvascular thrombosis and consumption of clotting
factors and platelets. This results in both thrombosis and bleeding.
, 7. A patient with diabetes mellitus presents with polyuria, polydipsia,
and polyphagia. The polyuria is primarily caused by:
A. Increased thirst leading to excessive fluid intake
B. Glucosuria causing osmotic diuresis
C. Decreased antidiuretic hormone (ADH) secretion
D. Renal tubular damage
Correct Answer: B
Rationale: In diabetes mellitus, hyperglycemia exceeds the renal threshold for
glucose reabsorption, leading to glucosuria. Glucose acts as an osmotic
agent, drawing water into the urine (osmotic diuresis), resulting in polyuria.
8. The classic triad of acute pancreatitis includes:
A. Nausea, vomiting, and fever
B. Epigastric pain radiating to the back, nausea, and elevated serum
amylase
C. Jaundice, pruritus, and dark urine
D. Abdominal distension, constipation, and fever
Correct Answer: B
Rationale: Acute pancreatitis presents with epigastric pain that radiates to the
back, nausea and vomiting, and elevated serum amylase and lipase. The pain
is often described as "boring" or "penetrating."
9. A patient with coronary artery disease develops atherosclerosis. The
initial step in atherogenesis is:
A. Smooth muscle cell proliferation
B. Endothelial injury
C. Macrophage infiltration
D. Lipid accumulation in the intima
|Comprehensive Questions & Answers with
Rationales | 2026 Update
1. Which of the following is the primary mechanism of cellular injury in
hypoxic conditions?
A. DNA mutation
B. ATP depletion leading to loss of ion homeostasis
C. Free radical formation
D. Protein misfolding
Correct Answer: B
Rationale: Hypoxia impairs oxidative phosphorylation, leading to decreased
ATP production. The Na+/K+ ATPase pump requires ATP to maintain ion
gradients; failure of this pump causes intracellular sodium accumulation,
water influx, and cellular swelling. This is the hallmark of hypoxic cellular
injury.
2. A researcher studying pressure overload in cardiac myocytes
observes that sustained mechanical stretch leads to increased protein
synthesis and cell enlargement without cell division. Which
intracellular signaling pathway is most directly responsible for this
adaptive response?
A. Activation of the PI3K/Akt/mTOR pathway leading to increased
translation
B. Induction of p53-mediated cell cycle arrest and senescence
C. Upregulation of caspases and initiation of apoptosis
D. Activation of the unfolded protein response (UPR) due to ER stress
,Correct Answer: A
Rationale: Cardiac myocytes respond to increased workload by undergoing
hypertrophy, driven by the PI3K/Akt/mTOR pathway that enhances protein
synthesis. p53 activation would promote apoptosis or senescence, not
hypertrophy.
3. A chronic smoker develops emphysema. The underlying molecular
defect primarily involves:
A. Alpha-1 antitrypsin deficiency leading to elastase-mediated alveolar
destruction
B. Overproduction of mucus with squamous metaplasia
C. Bronchospasm and airway hyperreactivity
D. Alveolar wall fibrosis and scarring
Correct Answer: A
Rationale: Emphysema is characterized by permanent enlargement of
airspaces distal to terminal bronchioles. In smokers, an imbalance between
proteases (elastase) and antiproteases (alpha-1 antitrypsin) leads to alveolar
wall destruction. This is the basis of the protease-antiprotease theory.
4. A patient with chronic kidney disease develops anemia. The most
likely underlying mechanism is:
A. Iron deficiency due to poor dietary intake
B. Decreased erythropoietin production by damaged kidney tissue
C. Bone marrow suppression
D. Increased RBC destruction
Correct Answer: B
Rationale: Erythropoietin (EPO) is produced by peritubular fibroblasts in the
,kidney. Chronic kidney disease leads to reduced EPO production, resulting in
normocytic, normochromic anemia.
5. A patient with left-sided heart failure develops pulmonary edema.
The primary pathophysiologic mechanism is:
A. Increased capillary permeability due to inflammatory mediators
B. Increased hydrostatic pressure in pulmonary capillaries
C. Decreased plasma oncotic pressure
D. Lymphatic obstruction in the lungs
Correct Answer: B
Rationale: Left-sided heart failure causes increased left ventricular end-
diastolic pressure, leading to increased hydrostatic pressure in the pulmonary
capillaries. This forces fluid into the interstitial and alveolar spaces, causing
pulmonary edema.
6. A patient with sepsis develops disseminated intravascular
coagulation (DIC). The underlying mechanism involves:
A. Platelet hyperaggregation leading to microvascular thrombosis
B. Systemic activation of coagulation cascade with widespread
microvascular thrombosis and depletion of clotting factors
C. Heparin-induced thrombocytopenia
D. Vitamin K deficiency
Correct Answer: B
Rationale: DIC is characterized by widespread activation of the coagulation
cascade, leading to microvascular thrombosis and consumption of clotting
factors and platelets. This results in both thrombosis and bleeding.
, 7. A patient with diabetes mellitus presents with polyuria, polydipsia,
and polyphagia. The polyuria is primarily caused by:
A. Increased thirst leading to excessive fluid intake
B. Glucosuria causing osmotic diuresis
C. Decreased antidiuretic hormone (ADH) secretion
D. Renal tubular damage
Correct Answer: B
Rationale: In diabetes mellitus, hyperglycemia exceeds the renal threshold for
glucose reabsorption, leading to glucosuria. Glucose acts as an osmotic
agent, drawing water into the urine (osmotic diuresis), resulting in polyuria.
8. The classic triad of acute pancreatitis includes:
A. Nausea, vomiting, and fever
B. Epigastric pain radiating to the back, nausea, and elevated serum
amylase
C. Jaundice, pruritus, and dark urine
D. Abdominal distension, constipation, and fever
Correct Answer: B
Rationale: Acute pancreatitis presents with epigastric pain that radiates to the
back, nausea and vomiting, and elevated serum amylase and lipase. The pain
is often described as "boring" or "penetrating."
9. A patient with coronary artery disease develops atherosclerosis. The
initial step in atherogenesis is:
A. Smooth muscle cell proliferation
B. Endothelial injury
C. Macrophage infiltration
D. Lipid accumulation in the intima
