, Question 1
Which molecular event best explains the irreversible transition from reversible
to irreversible cell injury during prolonged ischemia?
A. Increased ATP production via anaerobic glycolysis
B. Severe membrane damage with massive calcium influx and lysosomal
enzyme release
C. Activation of anti-apoptotic Bcl-2 proteins
D. Upregulation of heat shock proteins
Correct Answer: B - Severe membrane damage with massive
calcium influx and lysosomal enzyme release
RATIONALE
Irreversible injury is marked by severe membrane damage, calcium
influx, and lysosomal enzyme leakage that destroy cellular
architecture. ATP depletion and calcium overload drive this transition,
while Bcl-2 and HSPs are protective. Anaerobic glycolysis is
insufficient and not the defining event.
Question 2
In a patient with chronic kidney disease, which mechanism most directly
contributes to anemia of CKD?
A. Increased erythropoietin production
B. Deficiency of erythropoietin due to peritubular fibroblast dysfunction
C. Enhanced iron absorption
D. Increased red blood cell survival
Correct Answer: B - Deficiency of erythropoietin due to
peritubular fibroblast dysfunction
Page 2
, RATIONALE
CKD anemia is primarily due to inadequate erythropoietin production
by peritubular fibroblasts in the damaged kidney. Iron absorption is
often decreased, and RBC survival is reduced, not increased.
Erythropoietin is not increased.
Question 3
Which pathophysiologic alteration is most characteristic of heart failure with
preserved ejection fraction (HFpEF)?
A. Reduced left ventricular compliance with impaired diastolic filling
B. Severe systolic dysfunction with reduced ejection fraction
C. Increased left ventricular end-diastolic volume
D. Primary valvular regurgitation
Correct Answer: A - Reduced left ventricular compliance with
impaired diastolic filling
RATIONALE
HFpEF is defined by impaired diastolic relaxation and increased
stiffness, leading to elevated filling pressures despite normal EF.
Systolic dysfunction and increased EDV are features of HFrEF, not
HFpEF. Valvular disease is not the primary mechanism.
Question 4
Which statement best describes the role of NETosis in the pathophysiology of
sepsis-induced organ dysfunction?
A. Release of neutrophil extracellular traps that degrade pathogens
without host tissue damage
B. Formation of web-like structures that trap pathogens but also cause
endothelial injury and microthrombosis
C. Suppression of inflammatory cytokine release
D. Enhancement of bacterial clearance without procoagulant effects
Page 3
, Correct Answer: B - Formation of web-like structures that trap
pathogens but also cause endothelial injury and microthrombosis
RATIONALE
NETosis releases DNA-histone complexes that trap pathogens but also
damage endothelium and promote microthrombosis, contributing to
organ failure. It is not purely protective; it exacerbates inflammation
and coagulation. Cytokine suppression is not a feature.
Question 5
Which acid-base disturbance is most likely in a patient with severe vomiting
and nasogastric suctioning?
A. Metabolic acidosis with increased anion gap
B. Metabolic alkalosis with hypokalemia and hypochloremia
C. Respiratory acidosis with hypercapnia
D. Metabolic acidosis with normal anion gap
Correct Answer: B - Metabolic alkalosis with hypokalemia and
hypochloremia
RATIONALE
Loss of gastric HCl leads to hypochloremic, hypokalemic metabolic
alkalosis. The kidney compensates by excreting bicarbonate, but
volume depletion perpetuates alkalosis. Other options do not match
the loss of gastric acid.
Question 6
Which mechanism explains the development of diabetic ketoacidosis in type 1
diabetes mellitus?
A. Excessive insulin secretion leading to hypoglycemia
B. Absolute insulin deficiency causing lipolysis and ketone body
production
C. Increased peripheral glucose uptake
Page 4
Which molecular event best explains the irreversible transition from reversible
to irreversible cell injury during prolonged ischemia?
A. Increased ATP production via anaerobic glycolysis
B. Severe membrane damage with massive calcium influx and lysosomal
enzyme release
C. Activation of anti-apoptotic Bcl-2 proteins
D. Upregulation of heat shock proteins
Correct Answer: B - Severe membrane damage with massive
calcium influx and lysosomal enzyme release
RATIONALE
Irreversible injury is marked by severe membrane damage, calcium
influx, and lysosomal enzyme leakage that destroy cellular
architecture. ATP depletion and calcium overload drive this transition,
while Bcl-2 and HSPs are protective. Anaerobic glycolysis is
insufficient and not the defining event.
Question 2
In a patient with chronic kidney disease, which mechanism most directly
contributes to anemia of CKD?
A. Increased erythropoietin production
B. Deficiency of erythropoietin due to peritubular fibroblast dysfunction
C. Enhanced iron absorption
D. Increased red blood cell survival
Correct Answer: B - Deficiency of erythropoietin due to
peritubular fibroblast dysfunction
Page 2
, RATIONALE
CKD anemia is primarily due to inadequate erythropoietin production
by peritubular fibroblasts in the damaged kidney. Iron absorption is
often decreased, and RBC survival is reduced, not increased.
Erythropoietin is not increased.
Question 3
Which pathophysiologic alteration is most characteristic of heart failure with
preserved ejection fraction (HFpEF)?
A. Reduced left ventricular compliance with impaired diastolic filling
B. Severe systolic dysfunction with reduced ejection fraction
C. Increased left ventricular end-diastolic volume
D. Primary valvular regurgitation
Correct Answer: A - Reduced left ventricular compliance with
impaired diastolic filling
RATIONALE
HFpEF is defined by impaired diastolic relaxation and increased
stiffness, leading to elevated filling pressures despite normal EF.
Systolic dysfunction and increased EDV are features of HFrEF, not
HFpEF. Valvular disease is not the primary mechanism.
Question 4
Which statement best describes the role of NETosis in the pathophysiology of
sepsis-induced organ dysfunction?
A. Release of neutrophil extracellular traps that degrade pathogens
without host tissue damage
B. Formation of web-like structures that trap pathogens but also cause
endothelial injury and microthrombosis
C. Suppression of inflammatory cytokine release
D. Enhancement of bacterial clearance without procoagulant effects
Page 3
, Correct Answer: B - Formation of web-like structures that trap
pathogens but also cause endothelial injury and microthrombosis
RATIONALE
NETosis releases DNA-histone complexes that trap pathogens but also
damage endothelium and promote microthrombosis, contributing to
organ failure. It is not purely protective; it exacerbates inflammation
and coagulation. Cytokine suppression is not a feature.
Question 5
Which acid-base disturbance is most likely in a patient with severe vomiting
and nasogastric suctioning?
A. Metabolic acidosis with increased anion gap
B. Metabolic alkalosis with hypokalemia and hypochloremia
C. Respiratory acidosis with hypercapnia
D. Metabolic acidosis with normal anion gap
Correct Answer: B - Metabolic alkalosis with hypokalemia and
hypochloremia
RATIONALE
Loss of gastric HCl leads to hypochloremic, hypokalemic metabolic
alkalosis. The kidney compensates by excreting bicarbonate, but
volume depletion perpetuates alkalosis. Other options do not match
the loss of gastric acid.
Question 6
Which mechanism explains the development of diabetic ketoacidosis in type 1
diabetes mellitus?
A. Excessive insulin secretion leading to hypoglycemia
B. Absolute insulin deficiency causing lipolysis and ketone body
production
C. Increased peripheral glucose uptake
Page 4
