PATHOPHYSIOLOGY FINAL EXAM /
ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS WITH RATIONALES
GRADED A+ LATEST
1. A 55-year-old male presents with fatigue, pallor, and shortness of breath on
exertion. Lab results show hemoglobin of 8 g/dL and mean corpuscular volume
(MCV) of 70 fL. Which type of anemia is most likely?
A. Iron-deficiency anemia
B. Vitamin B12 deficiency
C. Aplastic anemia
D. Hemolytic anemia
Answer: A. Iron-deficiency anemia
Rationale: Low MCV indicates microcytic anemia. Iron deficiency is the most
common cause of microcytic anemia, often due to chronic blood loss or poor
dietary intake. Vitamin B12 deficiency usually causes macrocytic anemia (high
MCV).
2. A patient develops sudden dyspnea and pleuritic chest pain after being
immobilized for 5 days post-surgery. Which pathophysiologic process is most
likely occurring?
A. Myocardial infarction
B. Pulmonary embolism
C. Asthma exacerbation
D. Pneumothorax
Answer: B. Pulmonary embolism
Rationale: Immobilization increases the risk of venous thromboembolism. Sudden
onset dyspnea and pleuritic pain are classic signs of pulmonary embolism.
,3. A 60-year-old patient with long-standing hypertension develops left ventricular
hypertrophy (LVH). What is the primary pathophysiologic mechanism causing
LVH?
A. Volume overload
B. Pressure overload
C. Myocardial ischemia
D. Valvular stenosis
Answer: B. Pressure overload
Rationale: Chronic hypertension increases afterload, causing the left ventricle to
work harder and develop concentric hypertrophy as an adaptive mechanism.
4. Which of the following best explains why a patient with cirrhosis develops
ascites?
A. Increased oncotic pressure
B. Portal hypertension and hypoalbuminemia
C. Increased lymphatic drainage
D. Decreased sodium retention
Answer: B. Portal hypertension and hypoalbuminemia
Rationale: Cirrhosis leads to increased portal venous pressure and decreased
albumin production, resulting in fluid accumulation in the peritoneal cavity.
5. A patient presents with polyuria, polydipsia, and hypernatremia. Laboratory
tests reveal high serum osmolality and low urine osmolality. Which disorder is
most consistent with these findings?
A. Diabetes mellitus
B. Diabetes insipidus
C. Syndrome of inappropriate antidiuretic hormone (SIADH)
D. Addison’s disease
Answer: B. Diabetes insipidus
Rationale: Diabetes insipidus is characterized by inability to concentrate urine due
to ADH deficiency (central) or resistance (nephrogenic), leading to polyuria,
hypernatremia, and dilute urine.
,6. Which inflammatory mediator is primarily responsible for the redness and heat
observed in acute inflammation?
A. Histamine
B. Prostaglandins
C. Bradykinin
D. Cytokines
Answer: A. Histamine
Rationale: Histamine causes vasodilation, which increases blood flow to the
affected area, leading to redness (rubor) and heat (calor).
7. A 48-year-old male with chronic alcohol use presents with confusion, ataxia,
and ophthalmoplegia. What vitamin deficiency is most likely responsible?
A. Vitamin B1 (thiamine)
B. Vitamin B6 (pyridoxine)
C. Vitamin B12 (cobalamin)
D. Vitamin K
Answer: A. Vitamin B1 (thiamine)
Rationale: Chronic alcoholics are at risk for thiamine deficiency, which can lead
to Wernicke’s encephalopathy (triad: confusion, ataxia, ophthalmoplegia).
8. In type 2 diabetes mellitus, insulin resistance primarily affects which tissue?
A. Liver
B. Skeletal muscle
C. Adipose tissue
D. All of the above
Answer: D. All of the above
Rationale: Insulin resistance in type 2 diabetes affects multiple tissues: skeletal
muscle (decreased glucose uptake), liver (increased gluconeogenesis), and adipose
tissue (increased lipolysis).
, 9. A patient presents with fatigue and a “moon face.” Lab tests reveal elevated
cortisol levels. Which condition is most likely?
A. Addison’s disease
B. Cushing’s syndrome
C. Hyperthyroidism
D. Hypopituitarism
Answer: B. Cushing’s syndrome
Rationale: Chronic elevated cortisol (endogenous or exogenous) causes
Cushingoid features such as moon face, truncal obesity, and muscle weakness.
10. Which electrolyte imbalance is most commonly associated with chronic kidney
disease (CKD)?
A. Hypokalemia
B. Hyperkalemia
C. Hypocalcemia
D. Hypernatremia
Answer: B. Hyperkalemia
Rationale: CKD reduces renal potassium excretion, leading to hyperkalemia,
which can be life-threatening if untreated.
11. A patient with acute pancreatitis is at risk for hypocalcemia. What is the
primary mechanism?
A. Vitamin D deficiency
B. Fat saponification by pancreatic enzymes
C. Renal loss of calcium
D. Hyperparathyroidism
Answer: B. Fat saponification by pancreatic enzymes
Rationale: Lipase released during pancreatitis hydrolyzes triglycerides into fatty
acids, which bind calcium and reduce serum calcium levels.
ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS WITH RATIONALES
GRADED A+ LATEST
1. A 55-year-old male presents with fatigue, pallor, and shortness of breath on
exertion. Lab results show hemoglobin of 8 g/dL and mean corpuscular volume
(MCV) of 70 fL. Which type of anemia is most likely?
A. Iron-deficiency anemia
B. Vitamin B12 deficiency
C. Aplastic anemia
D. Hemolytic anemia
Answer: A. Iron-deficiency anemia
Rationale: Low MCV indicates microcytic anemia. Iron deficiency is the most
common cause of microcytic anemia, often due to chronic blood loss or poor
dietary intake. Vitamin B12 deficiency usually causes macrocytic anemia (high
MCV).
2. A patient develops sudden dyspnea and pleuritic chest pain after being
immobilized for 5 days post-surgery. Which pathophysiologic process is most
likely occurring?
A. Myocardial infarction
B. Pulmonary embolism
C. Asthma exacerbation
D. Pneumothorax
Answer: B. Pulmonary embolism
Rationale: Immobilization increases the risk of venous thromboembolism. Sudden
onset dyspnea and pleuritic pain are classic signs of pulmonary embolism.
,3. A 60-year-old patient with long-standing hypertension develops left ventricular
hypertrophy (LVH). What is the primary pathophysiologic mechanism causing
LVH?
A. Volume overload
B. Pressure overload
C. Myocardial ischemia
D. Valvular stenosis
Answer: B. Pressure overload
Rationale: Chronic hypertension increases afterload, causing the left ventricle to
work harder and develop concentric hypertrophy as an adaptive mechanism.
4. Which of the following best explains why a patient with cirrhosis develops
ascites?
A. Increased oncotic pressure
B. Portal hypertension and hypoalbuminemia
C. Increased lymphatic drainage
D. Decreased sodium retention
Answer: B. Portal hypertension and hypoalbuminemia
Rationale: Cirrhosis leads to increased portal venous pressure and decreased
albumin production, resulting in fluid accumulation in the peritoneal cavity.
5. A patient presents with polyuria, polydipsia, and hypernatremia. Laboratory
tests reveal high serum osmolality and low urine osmolality. Which disorder is
most consistent with these findings?
A. Diabetes mellitus
B. Diabetes insipidus
C. Syndrome of inappropriate antidiuretic hormone (SIADH)
D. Addison’s disease
Answer: B. Diabetes insipidus
Rationale: Diabetes insipidus is characterized by inability to concentrate urine due
to ADH deficiency (central) or resistance (nephrogenic), leading to polyuria,
hypernatremia, and dilute urine.
,6. Which inflammatory mediator is primarily responsible for the redness and heat
observed in acute inflammation?
A. Histamine
B. Prostaglandins
C. Bradykinin
D. Cytokines
Answer: A. Histamine
Rationale: Histamine causes vasodilation, which increases blood flow to the
affected area, leading to redness (rubor) and heat (calor).
7. A 48-year-old male with chronic alcohol use presents with confusion, ataxia,
and ophthalmoplegia. What vitamin deficiency is most likely responsible?
A. Vitamin B1 (thiamine)
B. Vitamin B6 (pyridoxine)
C. Vitamin B12 (cobalamin)
D. Vitamin K
Answer: A. Vitamin B1 (thiamine)
Rationale: Chronic alcoholics are at risk for thiamine deficiency, which can lead
to Wernicke’s encephalopathy (triad: confusion, ataxia, ophthalmoplegia).
8. In type 2 diabetes mellitus, insulin resistance primarily affects which tissue?
A. Liver
B. Skeletal muscle
C. Adipose tissue
D. All of the above
Answer: D. All of the above
Rationale: Insulin resistance in type 2 diabetes affects multiple tissues: skeletal
muscle (decreased glucose uptake), liver (increased gluconeogenesis), and adipose
tissue (increased lipolysis).
, 9. A patient presents with fatigue and a “moon face.” Lab tests reveal elevated
cortisol levels. Which condition is most likely?
A. Addison’s disease
B. Cushing’s syndrome
C. Hyperthyroidism
D. Hypopituitarism
Answer: B. Cushing’s syndrome
Rationale: Chronic elevated cortisol (endogenous or exogenous) causes
Cushingoid features such as moon face, truncal obesity, and muscle weakness.
10. Which electrolyte imbalance is most commonly associated with chronic kidney
disease (CKD)?
A. Hypokalemia
B. Hyperkalemia
C. Hypocalcemia
D. Hypernatremia
Answer: B. Hyperkalemia
Rationale: CKD reduces renal potassium excretion, leading to hyperkalemia,
which can be life-threatening if untreated.
11. A patient with acute pancreatitis is at risk for hypocalcemia. What is the
primary mechanism?
A. Vitamin D deficiency
B. Fat saponification by pancreatic enzymes
C. Renal loss of calcium
D. Hyperparathyroidism
Answer: B. Fat saponification by pancreatic enzymes
Rationale: Lipase released during pancreatitis hydrolyzes triglycerides into fatty
acids, which bind calcium and reduce serum calcium levels.
