APPLIED PATHOPHYSIOLOGY EXAM REVIEW WITH
QUESTIONS AND CORRECT ANSWERS 2026
1. Which of the following best describes the primary pathophysiological mechanism
underlying type 2 diabetes mellitus?
A. Absolute insulin deficiency due to autoimmune destruction of pancreatic beta
cells
B. Insulin resistance combined with relative insulin deficiency
C. Excessive glucagon secretion leading to hyperglycemia
D. Impaired glucose uptake solely due to obesity
Correct Answer: B
Explanation: Type 2 diabetes is characterized by insulin resistance in
peripheral tissues (muscle, fat, liver) paired with a compensatory but ultimately
insufficient insulin secretion from beta cells. Option A describes type 1 diabetes,
C is secondary not primary, and D is too narrow as obesity is a risk factor but
not the sole mechanism.
2. In the context of acute respiratory distress syndrome (ARDS), what is the
hallmark pathological finding?
A. Bronchoconstriction and mucus plugging
B. Diffuse alveolar damage with non-cardiogenic pulmonary edema
C. Pulmonary embolism with ventilation-perfusion mismatch
D. Thickening of the pleura restricting lung expansion
Correct Answer: B
Explanation: ARDS is defined by diffuse alveolar damage causing increased
capillary permeability and non-cardiogenic (not heart failure-related)
pulmonary edema. Option A describes asthma, C describes pulmonary
embolism, and D describes pleural disease.
3. Which cytokine is most critically involved in the systemic inflammatory response
syndrome (SIRS) leading to septic shock?
A. Interleukin-10 (IL-10)
B. Tumor necrosis factor-alpha (TNF-α)
C. Transforming growth factor-beta (TGF-β)
D. Interferon-gamma (IFN-γ)
Correct Answer: B
Explanation: TNF-α is a key proinflammatory cytokine that initiates the
cascade in sepsis, causing vasodilation, capillary leak, and organ dysfunction.
IL-10 and TGF-β are anti-inflammatory, while IFN-γ is more involved in viral
immunity and macrophage activation.
,4. A patient with chronic kidney disease presents with metabolic acidosis. What is
the primary mechanisms responsible?
A. Increased bicarbonate reabsorption in the proximal tubule
B. Decreased ammonium excretion and impaired acid secretion
C. Excessive loss of bicarbonate in the urine
D. Overproduction of lactic acid due to tissue hypoxia
Correct Answer: B
Explanation: In CKD, the kidneys lose the ability to excrete hydrogen ions as
ammonium and regenerate bicarbonate, leading to metabolic acidosis. Option A
would cause alkalosis, C is seen in renal tubular acidosis type 2, and D is lactic
acidosis not primarily CKD-related.
5. Which of the following best explains the pathogenesis of hemolytic anemia in
autoimmune hemolytic anemia (AIHA)?
A. Defect in hemoglobin synthesis
B. Antibody-mediated destruction of red blood cells
C. Bone marrow failure to produce red blood cells
D. Iron deficiency due to chronic blood loss
Correct Answer: B
Explanation: AIHA involves autoantibodies (IgG or IgM) binding to RBCs,
leading to their destruction by macrophages in the spleen or complement-
mediated lysis. Option A is thalassemia/sickle cell, C is aplastic anemia, and D is
iron deficiency anemia.
6. In heart failure with preserved ejection fraction (HFpEF), what is the key
pathophysiological abnormality?
A. Reduced contractility of the left ventricle
B. Impaired ventricular relaxation and increased stiffness
C. Valvular stenosis causing outflow obstruction
D. Dilated cardiomyopathy with chamber enlargement
Correct Answer: B
Explanation: HFpEF is characterized by diastolic dysfunction—impaired
relaxation and increased stiffness of the LV—while systolic function (ejection
fraction) remains normal. Option A and D describe HFrEF, and C describes
valvular disease.
7. Which of the following is the primary driver of hepatic encephalopathy in
cirrhosis?
A. Hypoglycemia due to liver failure
, B. Accumulation of ammonia and other neurotoxins
C. Electrolyte imbalances causing neuronal dysfunction
D. Direct viral toxicity to neurons
Correct Answer: B
Explanation: In cirrhosis, the liver fails to detoxify ammonia, which crosses the
blood-brain barrier and causes astrocyte swelling and neuronal dysfunction.
Hypoglycemia and electrolytes may contribute but are not primary; viral
toxicity is not the mechanism.
8. What is the main pathophysiological difference between obstructive and
restrictive lung diseases?
A. Obstructive: reduced airflow; Restrictive: reduced lung volumes
B. Obstructive: reduced lung volumes; Restrictive: reduced airflow
C. Obstructive: alveolar destruction; Restrictive: airway inflammation
D. Obstructive: pulmonary fibrosis; Restrictive: bronchoconstriction
Correct Answer: A
Explanation: Obstructive diseases (e.g., COPD, asthma) impair airflow
(reduced FEV1/FVC), while restrictive diseases (e.g., fibrosis) reduce total lung
capacity and volumes. Options B, C, and D reverse or misattribute the
mechanisms.
9. In the coagulation cascade, which factor is the common final pathway
convergence point?
A. Factor VIII
B. Factor X
C. Factor XII
D. Factor XIII
Correct Answer: B
Explanation: Both intrinsic and extrinsic pathways converge at Factor X, which
activates thrombin (Factor II) leading to fibrin formation. Factor VIII is
intrinsic, XII initiates intrinsic, and XIII stabilizes fibrin.
10. Which mechanism best explains the edema formation in nephrotic syndrome?
A. Increased capillary hydrostatic pressure
B. Decreased plasma oncotic pressure due to hypoalbuminemia
C. Lymphatic obstruction
D. Sodium retention secondary to renal artery stenosis
Correct Answer: B
Explanation: Nephrotic syndrome causes massive proteinuria leading to
hypoalbuminemia, reducing plasma oncotic pressure and causing fluid to shift
QUESTIONS AND CORRECT ANSWERS 2026
1. Which of the following best describes the primary pathophysiological mechanism
underlying type 2 diabetes mellitus?
A. Absolute insulin deficiency due to autoimmune destruction of pancreatic beta
cells
B. Insulin resistance combined with relative insulin deficiency
C. Excessive glucagon secretion leading to hyperglycemia
D. Impaired glucose uptake solely due to obesity
Correct Answer: B
Explanation: Type 2 diabetes is characterized by insulin resistance in
peripheral tissues (muscle, fat, liver) paired with a compensatory but ultimately
insufficient insulin secretion from beta cells. Option A describes type 1 diabetes,
C is secondary not primary, and D is too narrow as obesity is a risk factor but
not the sole mechanism.
2. In the context of acute respiratory distress syndrome (ARDS), what is the
hallmark pathological finding?
A. Bronchoconstriction and mucus plugging
B. Diffuse alveolar damage with non-cardiogenic pulmonary edema
C. Pulmonary embolism with ventilation-perfusion mismatch
D. Thickening of the pleura restricting lung expansion
Correct Answer: B
Explanation: ARDS is defined by diffuse alveolar damage causing increased
capillary permeability and non-cardiogenic (not heart failure-related)
pulmonary edema. Option A describes asthma, C describes pulmonary
embolism, and D describes pleural disease.
3. Which cytokine is most critically involved in the systemic inflammatory response
syndrome (SIRS) leading to septic shock?
A. Interleukin-10 (IL-10)
B. Tumor necrosis factor-alpha (TNF-α)
C. Transforming growth factor-beta (TGF-β)
D. Interferon-gamma (IFN-γ)
Correct Answer: B
Explanation: TNF-α is a key proinflammatory cytokine that initiates the
cascade in sepsis, causing vasodilation, capillary leak, and organ dysfunction.
IL-10 and TGF-β are anti-inflammatory, while IFN-γ is more involved in viral
immunity and macrophage activation.
,4. A patient with chronic kidney disease presents with metabolic acidosis. What is
the primary mechanisms responsible?
A. Increased bicarbonate reabsorption in the proximal tubule
B. Decreased ammonium excretion and impaired acid secretion
C. Excessive loss of bicarbonate in the urine
D. Overproduction of lactic acid due to tissue hypoxia
Correct Answer: B
Explanation: In CKD, the kidneys lose the ability to excrete hydrogen ions as
ammonium and regenerate bicarbonate, leading to metabolic acidosis. Option A
would cause alkalosis, C is seen in renal tubular acidosis type 2, and D is lactic
acidosis not primarily CKD-related.
5. Which of the following best explains the pathogenesis of hemolytic anemia in
autoimmune hemolytic anemia (AIHA)?
A. Defect in hemoglobin synthesis
B. Antibody-mediated destruction of red blood cells
C. Bone marrow failure to produce red blood cells
D. Iron deficiency due to chronic blood loss
Correct Answer: B
Explanation: AIHA involves autoantibodies (IgG or IgM) binding to RBCs,
leading to their destruction by macrophages in the spleen or complement-
mediated lysis. Option A is thalassemia/sickle cell, C is aplastic anemia, and D is
iron deficiency anemia.
6. In heart failure with preserved ejection fraction (HFpEF), what is the key
pathophysiological abnormality?
A. Reduced contractility of the left ventricle
B. Impaired ventricular relaxation and increased stiffness
C. Valvular stenosis causing outflow obstruction
D. Dilated cardiomyopathy with chamber enlargement
Correct Answer: B
Explanation: HFpEF is characterized by diastolic dysfunction—impaired
relaxation and increased stiffness of the LV—while systolic function (ejection
fraction) remains normal. Option A and D describe HFrEF, and C describes
valvular disease.
7. Which of the following is the primary driver of hepatic encephalopathy in
cirrhosis?
A. Hypoglycemia due to liver failure
, B. Accumulation of ammonia and other neurotoxins
C. Electrolyte imbalances causing neuronal dysfunction
D. Direct viral toxicity to neurons
Correct Answer: B
Explanation: In cirrhosis, the liver fails to detoxify ammonia, which crosses the
blood-brain barrier and causes astrocyte swelling and neuronal dysfunction.
Hypoglycemia and electrolytes may contribute but are not primary; viral
toxicity is not the mechanism.
8. What is the main pathophysiological difference between obstructive and
restrictive lung diseases?
A. Obstructive: reduced airflow; Restrictive: reduced lung volumes
B. Obstructive: reduced lung volumes; Restrictive: reduced airflow
C. Obstructive: alveolar destruction; Restrictive: airway inflammation
D. Obstructive: pulmonary fibrosis; Restrictive: bronchoconstriction
Correct Answer: A
Explanation: Obstructive diseases (e.g., COPD, asthma) impair airflow
(reduced FEV1/FVC), while restrictive diseases (e.g., fibrosis) reduce total lung
capacity and volumes. Options B, C, and D reverse or misattribute the
mechanisms.
9. In the coagulation cascade, which factor is the common final pathway
convergence point?
A. Factor VIII
B. Factor X
C. Factor XII
D. Factor XIII
Correct Answer: B
Explanation: Both intrinsic and extrinsic pathways converge at Factor X, which
activates thrombin (Factor II) leading to fibrin formation. Factor VIII is
intrinsic, XII initiates intrinsic, and XIII stabilizes fibrin.
10. Which mechanism best explains the edema formation in nephrotic syndrome?
A. Increased capillary hydrostatic pressure
B. Decreased plasma oncotic pressure due to hypoalbuminemia
C. Lymphatic obstruction
D. Sodium retention secondary to renal artery stenosis
Correct Answer: B
Explanation: Nephrotic syndrome causes massive proteinuria leading to
hypoalbuminemia, reducing plasma oncotic pressure and causing fluid to shift
