WGU D236 Pathophysiology
Objective Assessment: 200 Verified
Questions & Comprehensive
Rationales for Exam Success
(2026/2027) | FOR WESTERN
GOVERNORS UNIVERSITY
Question 1
Q: In cellular injury, which process directly results from ATP depletion leading to
sodium-potassium pump failure?
• A: Cellular swelling (edema).
• Rationale: ATP depletion impairs the Na⁺/K⁺ ATPase pump, causing sodium to
accumulate intracellularly. Water follows sodium osmotically, leading to
cellular swelling, which is the earliest sign of reversible cell injury.
Question 2
Q: Which type of necrosis is most commonly associated with granulomatous
infections like tuberculosis?
• A: Caseous necrosis.
• Rationale: Caseous necrosis is characterized by a cheese-like, friable
appearance and is classically seen in tuberculosis and fungal infections, where
granulomas form.
,Question 3
Q: Which cellular adaptation is most likely to occur in the left ventricular myocardium
of a patient with chronic, uncontrolled hypertension?
• A: Hypertrophy.
• Rationale: Hypertrophy is an increase in cell size to meet increased workload
demands. The left ventricle hypertrophies to compensate for the increased
afterload caused by chronic hypertension.
Question 4
Q: What is the hallmark feature of apoptosis that distinguishes it from necrosis?
• A: DNA fragmentation with preserved cell membrane integrity.
• Rationale: Apoptosis is programmed, energy-dependent cell death that does
not trigger an inflammatory response because the cell membrane remains
intact until the cell is cleared by phagocytosis.
Question 5
Q: A patient with chronic alcoholism develops liver damage. The hepatocytes show
enlarged, pale cytoplasm with fat vacuoles. This is an example of which cellular
adaptation?
• A: Fatty change (steatosis).
• Rationale: This is a form of reversible injury where toxic metabolites (like
acetaldehyde from alcohol) interfere with lipid metabolism, causing
triglycerides to accumulate within hepatocytes.
,Question 6
Q: Which electrolyte imbalance is most likely to cause Trousseau's and Chvostek's
signs?
• A: Hypocalcemia.
• Rationale: Low serum calcium increases neuronal membrane excitability.
Chvostek's (facial twitching upon tapping) and Trousseau's (carpal spasm
upon inflating a BP cuff) are classic signs of hypocalcemia.
Question 7
Q: Untreated severe metabolic acidosis will most directly lead to which secondary
electrolyte disturbance?
• A: Hyperkalemia.
• Rationale: In acidosis, excess hydrogen ions (H⁺) move into cells to be
buffered. To maintain electrical neutrality, potassium (K⁺) shifts out of the cells
and into the bloodstream, causing hyperkalemia.
Question 8
Q: A patient is in hypovolemic shock due to a gastrointestinal bleed. What is the
initial compensatory cardiovascular response?
• A: Tachycardia.
• Rationale: Baroreceptors detect decreased blood volume and pressure,
leading to sympathetic nervous system activation, which increases heart rate
to maintain cardiac output.
, Question 9
Q: Which two pulmonary conditions are direct causes of respiratory acidosis?
• A: Cystic fibrosis and hypoventilation (from any cause, e.g., COPD, drug
overdose).
• Rationale: Both conditions lead to inadequate alveolar ventilation, causing
CO₂ retention (hypercapnia), which lowers blood pH.
Question 10
Q: A patient has an arterial blood gas (ABG) showing: pH 7.48, PaCO₂ 48 mmHg,
HCO₃⁻ 32 mEq/L. What is the primary acid-base disorder?
• A: Metabolic alkalosis.
• Rationale: The pH is elevated (alkalemia) and the HCO₃⁻ is high (metabolic).
The PaCO₂ is also elevated, which indicates a compensatory respiratory
attempt to retain CO₂ to offset the alkalosis, but the primary driver is the
elevated bicarbonate.
Question 11
Q: In cystic fibrosis, the underlying cellular defect directly affects which ion channel?
• A: CFTR (Cystic Fibrosis Transmembrane Conductance Regulator) chloride
channel.
• Rationale: Mutations in the CFTR gene cause defective chloride transport
across epithelial cells, leading to thick, dehydrated secretions in the lungs,
pancreas, and other organs.
Objective Assessment: 200 Verified
Questions & Comprehensive
Rationales for Exam Success
(2026/2027) | FOR WESTERN
GOVERNORS UNIVERSITY
Question 1
Q: In cellular injury, which process directly results from ATP depletion leading to
sodium-potassium pump failure?
• A: Cellular swelling (edema).
• Rationale: ATP depletion impairs the Na⁺/K⁺ ATPase pump, causing sodium to
accumulate intracellularly. Water follows sodium osmotically, leading to
cellular swelling, which is the earliest sign of reversible cell injury.
Question 2
Q: Which type of necrosis is most commonly associated with granulomatous
infections like tuberculosis?
• A: Caseous necrosis.
• Rationale: Caseous necrosis is characterized by a cheese-like, friable
appearance and is classically seen in tuberculosis and fungal infections, where
granulomas form.
,Question 3
Q: Which cellular adaptation is most likely to occur in the left ventricular myocardium
of a patient with chronic, uncontrolled hypertension?
• A: Hypertrophy.
• Rationale: Hypertrophy is an increase in cell size to meet increased workload
demands. The left ventricle hypertrophies to compensate for the increased
afterload caused by chronic hypertension.
Question 4
Q: What is the hallmark feature of apoptosis that distinguishes it from necrosis?
• A: DNA fragmentation with preserved cell membrane integrity.
• Rationale: Apoptosis is programmed, energy-dependent cell death that does
not trigger an inflammatory response because the cell membrane remains
intact until the cell is cleared by phagocytosis.
Question 5
Q: A patient with chronic alcoholism develops liver damage. The hepatocytes show
enlarged, pale cytoplasm with fat vacuoles. This is an example of which cellular
adaptation?
• A: Fatty change (steatosis).
• Rationale: This is a form of reversible injury where toxic metabolites (like
acetaldehyde from alcohol) interfere with lipid metabolism, causing
triglycerides to accumulate within hepatocytes.
,Question 6
Q: Which electrolyte imbalance is most likely to cause Trousseau's and Chvostek's
signs?
• A: Hypocalcemia.
• Rationale: Low serum calcium increases neuronal membrane excitability.
Chvostek's (facial twitching upon tapping) and Trousseau's (carpal spasm
upon inflating a BP cuff) are classic signs of hypocalcemia.
Question 7
Q: Untreated severe metabolic acidosis will most directly lead to which secondary
electrolyte disturbance?
• A: Hyperkalemia.
• Rationale: In acidosis, excess hydrogen ions (H⁺) move into cells to be
buffered. To maintain electrical neutrality, potassium (K⁺) shifts out of the cells
and into the bloodstream, causing hyperkalemia.
Question 8
Q: A patient is in hypovolemic shock due to a gastrointestinal bleed. What is the
initial compensatory cardiovascular response?
• A: Tachycardia.
• Rationale: Baroreceptors detect decreased blood volume and pressure,
leading to sympathetic nervous system activation, which increases heart rate
to maintain cardiac output.
, Question 9
Q: Which two pulmonary conditions are direct causes of respiratory acidosis?
• A: Cystic fibrosis and hypoventilation (from any cause, e.g., COPD, drug
overdose).
• Rationale: Both conditions lead to inadequate alveolar ventilation, causing
CO₂ retention (hypercapnia), which lowers blood pH.
Question 10
Q: A patient has an arterial blood gas (ABG) showing: pH 7.48, PaCO₂ 48 mmHg,
HCO₃⁻ 32 mEq/L. What is the primary acid-base disorder?
• A: Metabolic alkalosis.
• Rationale: The pH is elevated (alkalemia) and the HCO₃⁻ is high (metabolic).
The PaCO₂ is also elevated, which indicates a compensatory respiratory
attempt to retain CO₂ to offset the alkalosis, but the primary driver is the
elevated bicarbonate.
Question 11
Q: In cystic fibrosis, the underlying cellular defect directly affects which ion channel?
• A: CFTR (Cystic Fibrosis Transmembrane Conductance Regulator) chloride
channel.
• Rationale: Mutations in the CFTR gene cause defective chloride transport
across epithelial cells, leading to thick, dehydrated secretions in the lungs,
pancreas, and other organs.
