APEA pathophysiology 2026 exam prep pack _200 questions
with verified Answers &rationales
1. A patient with left-sided heart failure is most likely to develop which
manifestation first?
A. Peripheral edema
B. Hepatomegaly
C. Pulmonary congestion
D. Ascites
Answer: C. Pulmonary congestion
Rationale: Left-sided heart failure causes blood to back up into the pulmonary circulation,
producing pulmonary edema, crackles, and dyspnea before systemic venous congestion develops.
2. Which electrolyte imbalance is most commonly associated with peaked T
waves on ECG?
A. Hypokalemia
B. Hyperkalemia
C. Hypercalcemia
D. Hyponatremia
Answer: B. Hyperkalemia
Rationale: Elevated potassium levels alter cardiac conduction and commonly produce peaked T
waves, widened QRS complexes, and dysrhythmias.
3. The primary pathophysiologic problem in type 1 diabetes mellitus is:
A. Insulin resistance
B. Excess glucagon secretion
C. Autoimmune destruction of beta cells
D. Increased hepatic glycogen storage
,Answer: C. Autoimmune destruction of beta cells
Rationale: Type 1 diabetes results from autoimmune-mediated destruction of pancreatic beta
cells, leading to absolute insulin deficiency.
4. A patient with chronic obstructive pulmonary disease (COPD) is likely to
experience:
A. Increased lung elasticity
B. Hyperinflation of alveoli
C. Increased oxygen diffusion
D. Decreased residual volume
Answer: B. Hyperinflation of alveoli
Rationale: COPD causes air trapping and destruction of alveolar walls, resulting in
hyperinflation and impaired gas exchange.
5. Which hormone is primarily responsible for increasing blood calcium levels?
A. Calcitonin
B. Aldosterone
C. Parathyroid hormone
D. Insulin
Answer: C. Parathyroid hormone
Rationale: Parathyroid hormone raises serum calcium by stimulating bone resorption, renal
calcium reabsorption, and vitamin D activation.
6. The hallmark manifestation of nephrotic syndrome is:
A. Hematuria
B. Proteinuria
C. Pyuria
D. Glycosuria
Answer: B. Proteinuria
,Rationale: Nephrotic syndrome is characterized by massive protein loss in the urine due to
increased glomerular membrane permeability.
7. In respiratory acidosis, the body attempts compensation through:
A. Hyperventilation
B. Renal bicarbonate retention
C. Increased lactic acid production
D. Potassium excretion by lungs
Answer: B. Renal bicarbonate retention
Rationale: The kidneys compensate for respiratory acidosis by conserving bicarbonate and
excreting hydrogen ions.
8. Which condition is associated with demyelination in the central nervous
system?
A. Myasthenia gravis
B. Multiple sclerosis
C. Guillain-Barré syndrome
D. Parkinson disease
Answer: B. Multiple sclerosis
Rationale: Multiple sclerosis is an autoimmune disorder characterized by destruction of myelin
in the CNS.
9. A patient with hyperthyroidism commonly presents with:
A. Bradycardia
B. Cold intolerance
C. Weight gain
D. Tachycardia
Answer: D. Tachycardia
Rationale: Excess thyroid hormone increases metabolic activity and sympathetic stimulation,
causing tachycardia and heat intolerance.
, 10. The most common cause of myocardial infarction is:
A. Coronary artery vasospasm
B. Aortic stenosis
C. Atherosclerotic plaque rupture
D. Congenital heart disease
Answer: C. Atherosclerotic plaque rupture
Rationale: Plaque rupture leads to thrombus formation and acute obstruction of coronary blood
flow.
11. Which acid-base imbalance is expected in diabetic ketoacidosis?
A. Respiratory alkalosis
B. Metabolic alkalosis
C. Metabolic acidosis
D. Respiratory acidosis
Answer: C. Metabolic acidosis
Rationale: Accumulation of ketone bodies lowers blood pH, producing metabolic acidosis.
12. The primary cause of edema in liver cirrhosis is:
A. Increased albumin production
B. Portal hypertension and hypoalbuminemia
C. Excess erythropoietin
D. Hypercalcemia
Answer: B. Portal hypertension and hypoalbuminemia
Rationale: Reduced albumin lowers oncotic pressure while portal hypertension increases
hydrostatic pressure, promoting fluid leakage.
13. Which immune cell is primarily responsible for antibody production?
with verified Answers &rationales
1. A patient with left-sided heart failure is most likely to develop which
manifestation first?
A. Peripheral edema
B. Hepatomegaly
C. Pulmonary congestion
D. Ascites
Answer: C. Pulmonary congestion
Rationale: Left-sided heart failure causes blood to back up into the pulmonary circulation,
producing pulmonary edema, crackles, and dyspnea before systemic venous congestion develops.
2. Which electrolyte imbalance is most commonly associated with peaked T
waves on ECG?
A. Hypokalemia
B. Hyperkalemia
C. Hypercalcemia
D. Hyponatremia
Answer: B. Hyperkalemia
Rationale: Elevated potassium levels alter cardiac conduction and commonly produce peaked T
waves, widened QRS complexes, and dysrhythmias.
3. The primary pathophysiologic problem in type 1 diabetes mellitus is:
A. Insulin resistance
B. Excess glucagon secretion
C. Autoimmune destruction of beta cells
D. Increased hepatic glycogen storage
,Answer: C. Autoimmune destruction of beta cells
Rationale: Type 1 diabetes results from autoimmune-mediated destruction of pancreatic beta
cells, leading to absolute insulin deficiency.
4. A patient with chronic obstructive pulmonary disease (COPD) is likely to
experience:
A. Increased lung elasticity
B. Hyperinflation of alveoli
C. Increased oxygen diffusion
D. Decreased residual volume
Answer: B. Hyperinflation of alveoli
Rationale: COPD causes air trapping and destruction of alveolar walls, resulting in
hyperinflation and impaired gas exchange.
5. Which hormone is primarily responsible for increasing blood calcium levels?
A. Calcitonin
B. Aldosterone
C. Parathyroid hormone
D. Insulin
Answer: C. Parathyroid hormone
Rationale: Parathyroid hormone raises serum calcium by stimulating bone resorption, renal
calcium reabsorption, and vitamin D activation.
6. The hallmark manifestation of nephrotic syndrome is:
A. Hematuria
B. Proteinuria
C. Pyuria
D. Glycosuria
Answer: B. Proteinuria
,Rationale: Nephrotic syndrome is characterized by massive protein loss in the urine due to
increased glomerular membrane permeability.
7. In respiratory acidosis, the body attempts compensation through:
A. Hyperventilation
B. Renal bicarbonate retention
C. Increased lactic acid production
D. Potassium excretion by lungs
Answer: B. Renal bicarbonate retention
Rationale: The kidneys compensate for respiratory acidosis by conserving bicarbonate and
excreting hydrogen ions.
8. Which condition is associated with demyelination in the central nervous
system?
A. Myasthenia gravis
B. Multiple sclerosis
C. Guillain-Barré syndrome
D. Parkinson disease
Answer: B. Multiple sclerosis
Rationale: Multiple sclerosis is an autoimmune disorder characterized by destruction of myelin
in the CNS.
9. A patient with hyperthyroidism commonly presents with:
A. Bradycardia
B. Cold intolerance
C. Weight gain
D. Tachycardia
Answer: D. Tachycardia
Rationale: Excess thyroid hormone increases metabolic activity and sympathetic stimulation,
causing tachycardia and heat intolerance.
, 10. The most common cause of myocardial infarction is:
A. Coronary artery vasospasm
B. Aortic stenosis
C. Atherosclerotic plaque rupture
D. Congenital heart disease
Answer: C. Atherosclerotic plaque rupture
Rationale: Plaque rupture leads to thrombus formation and acute obstruction of coronary blood
flow.
11. Which acid-base imbalance is expected in diabetic ketoacidosis?
A. Respiratory alkalosis
B. Metabolic alkalosis
C. Metabolic acidosis
D. Respiratory acidosis
Answer: C. Metabolic acidosis
Rationale: Accumulation of ketone bodies lowers blood pH, producing metabolic acidosis.
12. The primary cause of edema in liver cirrhosis is:
A. Increased albumin production
B. Portal hypertension and hypoalbuminemia
C. Excess erythropoietin
D. Hypercalcemia
Answer: B. Portal hypertension and hypoalbuminemia
Rationale: Reduced albumin lowers oncotic pressure while portal hypertension increases
hydrostatic pressure, promoting fluid leakage.
13. Which immune cell is primarily responsible for antibody production?
