NURS 6501 • Advanced Pathophysiology
NURS 6501 — Advanced Pathophysiology Final Exam Review
2026–2027 | Practice Questions & Rationales
Disclaimer: This review document is an independent educational resource designed to support graduate nursing students in mastering
advanced pathophysiology concepts. It is not affiliated with, endorsed by, or derived from any actual or leaked examination materials
from Walden University or any other institution. All practice questions are original, evidence-based items created for study purposes
only.
Section 1: Cellular Adaptation, Injury, and Death
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Question 1
A patient has a genetic defect that causes the sodium-potassium pump (Na⁺/K⁺ ATPase) to function at
only 20% efficiency. What expected finding would the healthcare professional relate to this defect?
A. Cellular dehydration
B. Cellular swelling
C. Hyperpolarization of the cell membrane
D. Increased protein synthesis
Correct Answer: B. Cellular swelling
Rationale: The Na⁺/K⁺ ATPase pump maintains osmotic balance by actively transporting three sodium
ions out of the cell and two potassium ions into the cell for each ATP consumed. When pump function is
severely impaired, sodium accumulates intracellularly. Water follows sodium osmotically, leading to
cellular swelling (hydropic degeneration). This is a hallmark of reversible cell injury.
Why the other options are incorrect:
A. Cellular dehydration: This would occur if the pump were overactive and excessively extruding sodium,
not underactive. The failing pump causes sodium and water retention inside the cell.
C. Hyperpolarization: The resting membrane potential becomes less negative (depolarized) when the
pump fails, because the ionic gradients that maintain the negative resting potential dissipate.
Hyperpolarization would require increased potassium efflux or chloride influx, not pump failure.
D. Increased protein synthesis: ATP depletion and cellular swelling impair, rather than enhance, protein
synthesis. The swollen endoplasmic reticulum cannot function efficiently in protein production.
────────────────────────────────────────
Question 2
A 55-year-old male with a 30-pack-year smoking history develops squamous cell carcinoma of the lung.
The cellular adaptation that most commonly precedes the development of this malignancy in the
bronchial epithelium is:
A. Hyperplasia, an increase in the number of cells
B. Metaplasia, the replacement of one differentiated cell type with another
C. Hypertrophy, an increase in cell size without cell division
D. Dysplasia, disordered cell growth with loss of uniformity
Correct Answer: B. Metaplasia
Rationale: Chronic exposure to cigarette smoke irritates the bronchial epithelium, causing the normal
ciliated columnar epithelium to be replaced by stratified squamous epithelium (squamous metaplasia).
This is an adaptive response that allows the tissue to survive the noxious stimulus, but it comes at the
Final Exam Review 2026–2027 • Practice Resource
, NURS 6501 • Advanced Pathophysiology
cost of losing the protective mucociliary function. Metaplasia is the precursor change that can progress
to dysplasia and eventually carcinoma.
Why the other options are incorrect:
A. Hyperplasia: Hyperplasia involves an increase in cell number without a change in cell type. It can
occur in response to hormonal stimulation or chronic irritation, but it is not the characteristic adaptation
preceding squamous cell carcinoma in the bronchial epithelium.
C. Hypertrophy: Hypertrophy is an increase in cell size, typically seen in tissues incapable of division
(e.g., cardiac muscle, skeletal muscle). It does not involve a change in cell type and is not the precursor
lesion described here.
D. Dysplasia: Dysplasia is disordered, precancerous growth characterized by loss of uniformity and
architectural orientation. While dysplasia follows metaplasia and precedes carcinoma, metaplasia is
the earlier adaptive change that serves as the direct precursor in this scenario.
────────────────────────────────────────
Question 3
During cell injury caused by hypoxia, sodium and water move into the cell because:
A. The cell membrane becomes freely permeable to all ions
B. The pump that transports sodium out of the cell cannot function because of decreased ATP levels
C. Osmotic pressure is increased, which pulls additional sodium across the cell membrane
D. Oxygen is not available to bind with sodium to maintain it outside of the cell
Correct Answer: B. The pump that transports sodium out of the cell cannot function because of
decreased ATP levels
Rationale: Hypoxia leads to decreased oxidative phosphorylation and reduced ATP production. The
Na⁺/K⁺ ATPase pump is an energy-dependent process; without sufficient ATP, it fails to extrude sodium
from the cell. Sodium accumulates intracellularly, creating an osmotic gradient that draws water into
the cell, resulting in cellular swelling.
Why the other options are incorrect:
A. The cell membrane becomes freely permeable to all ions: This describes a severe, irreversible
membrane injury, not the early ATP-dependent mechanism of hypoxic cell injury. The membrane
remains selectively permeable but the active transport mechanism fails.
C. Osmotic pressure is increased, which pulls additional sodium across the cell membrane: Sodium
moves into the cell down its concentration gradient when the pump fails; it is not "pulled" by osmotic
pressure. Osmotic pressure changes are a consequence of sodium accumulation, not the primary cause
of sodium influx.
D. Oxygen is not available to bind with sodium to maintain it outside of the cell: Sodium is maintained
outside the cell by active transport, not by binding to oxygen. This statement reflects a
misunderstanding of sodium regulation.
Section 2: Fluid, Electrolyte, and Acid-Base Disorders
────────────────────────────────────────
Question 4
A 65-year-old male with COPD has worsening dyspnea and peripheral edema. Arterial blood gas analysis
reveals: pH 7.32, PaCO₂ 68 mm Hg, HCO₃⁻ 32 mEq/L. What is the acid-base disorder?
A. Acute respiratory acidosis
B. Chronic respiratory acidosis with metabolic compensation
Final Exam Review 2026–2027 • Practice Resource
, NURS 6501 • Advanced Pathophysiology
C. Metabolic alkalosis with respiratory compensation
D. Mixed metabolic alkalosis and respiratory acidosis
Correct Answer: B. Chronic respiratory acidosis with metabolic compensation
Rationale: The low pH (7.32) indicates acidosis, and the elevated PaCO₂ (68 mm Hg) confirms a
respiratory cause. The elevated HCO₃⁻ (32 mEq/L) indicates renal metabolic compensation, which takes
3–5 days to fully develop. In chronic respiratory acidosis, the kidneys retain bicarbonate to buffer the
excess carbonic acid, partially normalizing pH. The presence of significant bicarbonate elevation
distinguishes this from acute respiratory acidosis, in which HCO₃⁻ would be near normal.
Why the other options are incorrect:
A. Acute respiratory acidosis: Acute respiratory acidosis would show an elevated PaCO₂ with minimal
bicarbonate elevation (typically < 26 mEq/L) because renal compensation has not yet occurred. The
HCO₃⁻ of 32 mEq/L indicates chronic compensation.
C. Metabolic alkalosis with respiratory compensation: Metabolic alkalosis would present with an
elevated pH (> 7.45) and elevated HCO₃⁻. Here, the pH is acidotic, making this option inconsistent with
the primary disorder.
D. Mixed metabolic alkalosis and respiratory acidosis: A mixed disorder would require evidence of both
a primary metabolic alkalosis and a primary respiratory acidosis. While the elevated HCO₃⁻ could
suggest metabolic alkalosis, the clinical context and the expected compensatory response to chronic
respiratory acidosis fully explain the bicarbonate level without invoking a second primary disorder.
────────────────────────────────────────
Question 5
A patient with nephrotic syndrome develops generalized edema. Which mechanism is primarily
responsible?
A. Increased plasma oncotic pressure
B. Decreased plasma oncotic pressure
C. Decreased capillary permeability
D. Increased lymphatic drainage
Correct Answer: B. Decreased plasma oncotic pressure
Rationale: Nephrotic syndrome causes damage to the glomerular filtration barrier, resulting in massive
urinary protein loss, particularly albumin. Albumin is the primary determinant of plasma oncotic (colloid
osmotic) pressure. With hypoalbuminemia, plasma oncotic pressure drops, reducing the force that
draws fluid from the interstitial space back into the capillaries. Fluid shifts into the interstitial
compartment, causing generalized edema.
Why the other options are incorrect:
A. Increased plasma oncotic pressure: Increased oncotic pressure would draw fluid into the vascular
space and reduce edema, the opposite of what occurs in nephrotic syndrome.
C. Decreased capillary permeability: Nephrotic syndrome does not primarily involve decreased
permeability; if anything, capillary permeability may be altered by inflammatory mediators, but the
dominant mechanism is hypoalbuminemia.
D. Increased lymphatic drainage: Increased lymphatic drainage would help clear interstitial fluid and
reduce edema. In nephrotic syndrome, lymphatic drainage is not enhanced; the edema results from the
oncotic pressure imbalance.
────────────────────────────────────────
Final Exam Review 2026–2027 • Practice Resource
, NURS 6501 • Advanced Pathophysiology
Question 6
Which electrolyte abnormality is most commonly associated with cardiac dysrhythmias?
A. Hypermagnesemia
B. Hypercalcemia
C. Hypokalemia
D. Hypernatremia
Correct Answer: C. Hypokalemia
Rationale: Potassium plays a critical role in cardiac conduction and repolarization. Hypokalemia (serum
potassium < 3.5 mEq/L) increases the risk of ventricular arrhythmias, including premature ventricular
contractions, ventricular tachycardia, and torsades de pointes. ECG changes associated with
hypokalemia include flattened T waves, prominent U waves, and ST depression.
Why the other options are incorrect:
A. Hypermagnesemia: While severe hypermagnesemia can cause bradycardia and heart block, it is a
much less common cause of clinically significant dysrhythmias than hypokalemia.
B. Hypercalcemia: Hypercalcemia can cause ECG changes (shortened QT interval) and may increase
digoxin sensitivity, but it is not the most commonly associated electrolyte abnormality with
dysrhythmias.
D. Hypernatremia: Sodium abnormalities primarily affect neurologic function (e.g., altered mental
status, seizures) rather than cardiac conduction.
Section 3: Inflammation and Immunity
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Question 7
A 35-year-old male with a history of recurrent infections is found to have a genetic defect in the NADPH
oxidase enzyme system in his phagocytes. This defect results in chronic granulomatous disease, which
impairs the ability of phagocytes to:
A. Engulf and internalize bacteria through endocytosis
B. Produce reactive oxygen species needed for intracellular killing of pathogens
C. Present antigens to T lymphocytes via MHC class II molecules
D. Secrete complement proteins that opsonize bacteria
Correct Answer: B. Produce reactive oxygen species needed for intracellular killing of pathogens
Rationale: Chronic granulomatous disease (CGD) results from a defect in NADPH oxidase, the enzyme
responsible for the respiratory burst that generates superoxide and other reactive oxygen species (ROS).
Without ROS, phagocytes can engulf pathogens but cannot efficiently kill catalase-positive organisms
such as Staphylococcus aureus and Aspergillus species.
Why the other options are incorrect:
A. Engulf and internalize bacteria through endocytosis: Phagocytosis (engulfment) remains intact in
CGD. The defect is in intracellular killing, not in the uptake of pathogens.
C. Present antigens to T lymphocytes via MHC class II molecules: Antigen presentation is a function of
antigen-presenting cells and is not impaired by NADPH oxidase deficiency.
D. Secrete complement proteins that opsonize bacteria: Complement proteins are primarily synthesized
by the liver, not by phagocytes. Opsonization by complement is not the defective process in CGD.
────────────────────────────────────────
Final Exam Review 2026–2027 • Practice Resource
NURS 6501 — Advanced Pathophysiology Final Exam Review
2026–2027 | Practice Questions & Rationales
Disclaimer: This review document is an independent educational resource designed to support graduate nursing students in mastering
advanced pathophysiology concepts. It is not affiliated with, endorsed by, or derived from any actual or leaked examination materials
from Walden University or any other institution. All practice questions are original, evidence-based items created for study purposes
only.
Section 1: Cellular Adaptation, Injury, and Death
────────────────────────────────────────
Question 1
A patient has a genetic defect that causes the sodium-potassium pump (Na⁺/K⁺ ATPase) to function at
only 20% efficiency. What expected finding would the healthcare professional relate to this defect?
A. Cellular dehydration
B. Cellular swelling
C. Hyperpolarization of the cell membrane
D. Increased protein synthesis
Correct Answer: B. Cellular swelling
Rationale: The Na⁺/K⁺ ATPase pump maintains osmotic balance by actively transporting three sodium
ions out of the cell and two potassium ions into the cell for each ATP consumed. When pump function is
severely impaired, sodium accumulates intracellularly. Water follows sodium osmotically, leading to
cellular swelling (hydropic degeneration). This is a hallmark of reversible cell injury.
Why the other options are incorrect:
A. Cellular dehydration: This would occur if the pump were overactive and excessively extruding sodium,
not underactive. The failing pump causes sodium and water retention inside the cell.
C. Hyperpolarization: The resting membrane potential becomes less negative (depolarized) when the
pump fails, because the ionic gradients that maintain the negative resting potential dissipate.
Hyperpolarization would require increased potassium efflux or chloride influx, not pump failure.
D. Increased protein synthesis: ATP depletion and cellular swelling impair, rather than enhance, protein
synthesis. The swollen endoplasmic reticulum cannot function efficiently in protein production.
────────────────────────────────────────
Question 2
A 55-year-old male with a 30-pack-year smoking history develops squamous cell carcinoma of the lung.
The cellular adaptation that most commonly precedes the development of this malignancy in the
bronchial epithelium is:
A. Hyperplasia, an increase in the number of cells
B. Metaplasia, the replacement of one differentiated cell type with another
C. Hypertrophy, an increase in cell size without cell division
D. Dysplasia, disordered cell growth with loss of uniformity
Correct Answer: B. Metaplasia
Rationale: Chronic exposure to cigarette smoke irritates the bronchial epithelium, causing the normal
ciliated columnar epithelium to be replaced by stratified squamous epithelium (squamous metaplasia).
This is an adaptive response that allows the tissue to survive the noxious stimulus, but it comes at the
Final Exam Review 2026–2027 • Practice Resource
, NURS 6501 • Advanced Pathophysiology
cost of losing the protective mucociliary function. Metaplasia is the precursor change that can progress
to dysplasia and eventually carcinoma.
Why the other options are incorrect:
A. Hyperplasia: Hyperplasia involves an increase in cell number without a change in cell type. It can
occur in response to hormonal stimulation or chronic irritation, but it is not the characteristic adaptation
preceding squamous cell carcinoma in the bronchial epithelium.
C. Hypertrophy: Hypertrophy is an increase in cell size, typically seen in tissues incapable of division
(e.g., cardiac muscle, skeletal muscle). It does not involve a change in cell type and is not the precursor
lesion described here.
D. Dysplasia: Dysplasia is disordered, precancerous growth characterized by loss of uniformity and
architectural orientation. While dysplasia follows metaplasia and precedes carcinoma, metaplasia is
the earlier adaptive change that serves as the direct precursor in this scenario.
────────────────────────────────────────
Question 3
During cell injury caused by hypoxia, sodium and water move into the cell because:
A. The cell membrane becomes freely permeable to all ions
B. The pump that transports sodium out of the cell cannot function because of decreased ATP levels
C. Osmotic pressure is increased, which pulls additional sodium across the cell membrane
D. Oxygen is not available to bind with sodium to maintain it outside of the cell
Correct Answer: B. The pump that transports sodium out of the cell cannot function because of
decreased ATP levels
Rationale: Hypoxia leads to decreased oxidative phosphorylation and reduced ATP production. The
Na⁺/K⁺ ATPase pump is an energy-dependent process; without sufficient ATP, it fails to extrude sodium
from the cell. Sodium accumulates intracellularly, creating an osmotic gradient that draws water into
the cell, resulting in cellular swelling.
Why the other options are incorrect:
A. The cell membrane becomes freely permeable to all ions: This describes a severe, irreversible
membrane injury, not the early ATP-dependent mechanism of hypoxic cell injury. The membrane
remains selectively permeable but the active transport mechanism fails.
C. Osmotic pressure is increased, which pulls additional sodium across the cell membrane: Sodium
moves into the cell down its concentration gradient when the pump fails; it is not "pulled" by osmotic
pressure. Osmotic pressure changes are a consequence of sodium accumulation, not the primary cause
of sodium influx.
D. Oxygen is not available to bind with sodium to maintain it outside of the cell: Sodium is maintained
outside the cell by active transport, not by binding to oxygen. This statement reflects a
misunderstanding of sodium regulation.
Section 2: Fluid, Electrolyte, and Acid-Base Disorders
────────────────────────────────────────
Question 4
A 65-year-old male with COPD has worsening dyspnea and peripheral edema. Arterial blood gas analysis
reveals: pH 7.32, PaCO₂ 68 mm Hg, HCO₃⁻ 32 mEq/L. What is the acid-base disorder?
A. Acute respiratory acidosis
B. Chronic respiratory acidosis with metabolic compensation
Final Exam Review 2026–2027 • Practice Resource
, NURS 6501 • Advanced Pathophysiology
C. Metabolic alkalosis with respiratory compensation
D. Mixed metabolic alkalosis and respiratory acidosis
Correct Answer: B. Chronic respiratory acidosis with metabolic compensation
Rationale: The low pH (7.32) indicates acidosis, and the elevated PaCO₂ (68 mm Hg) confirms a
respiratory cause. The elevated HCO₃⁻ (32 mEq/L) indicates renal metabolic compensation, which takes
3–5 days to fully develop. In chronic respiratory acidosis, the kidneys retain bicarbonate to buffer the
excess carbonic acid, partially normalizing pH. The presence of significant bicarbonate elevation
distinguishes this from acute respiratory acidosis, in which HCO₃⁻ would be near normal.
Why the other options are incorrect:
A. Acute respiratory acidosis: Acute respiratory acidosis would show an elevated PaCO₂ with minimal
bicarbonate elevation (typically < 26 mEq/L) because renal compensation has not yet occurred. The
HCO₃⁻ of 32 mEq/L indicates chronic compensation.
C. Metabolic alkalosis with respiratory compensation: Metabolic alkalosis would present with an
elevated pH (> 7.45) and elevated HCO₃⁻. Here, the pH is acidotic, making this option inconsistent with
the primary disorder.
D. Mixed metabolic alkalosis and respiratory acidosis: A mixed disorder would require evidence of both
a primary metabolic alkalosis and a primary respiratory acidosis. While the elevated HCO₃⁻ could
suggest metabolic alkalosis, the clinical context and the expected compensatory response to chronic
respiratory acidosis fully explain the bicarbonate level without invoking a second primary disorder.
────────────────────────────────────────
Question 5
A patient with nephrotic syndrome develops generalized edema. Which mechanism is primarily
responsible?
A. Increased plasma oncotic pressure
B. Decreased plasma oncotic pressure
C. Decreased capillary permeability
D. Increased lymphatic drainage
Correct Answer: B. Decreased plasma oncotic pressure
Rationale: Nephrotic syndrome causes damage to the glomerular filtration barrier, resulting in massive
urinary protein loss, particularly albumin. Albumin is the primary determinant of plasma oncotic (colloid
osmotic) pressure. With hypoalbuminemia, plasma oncotic pressure drops, reducing the force that
draws fluid from the interstitial space back into the capillaries. Fluid shifts into the interstitial
compartment, causing generalized edema.
Why the other options are incorrect:
A. Increased plasma oncotic pressure: Increased oncotic pressure would draw fluid into the vascular
space and reduce edema, the opposite of what occurs in nephrotic syndrome.
C. Decreased capillary permeability: Nephrotic syndrome does not primarily involve decreased
permeability; if anything, capillary permeability may be altered by inflammatory mediators, but the
dominant mechanism is hypoalbuminemia.
D. Increased lymphatic drainage: Increased lymphatic drainage would help clear interstitial fluid and
reduce edema. In nephrotic syndrome, lymphatic drainage is not enhanced; the edema results from the
oncotic pressure imbalance.
────────────────────────────────────────
Final Exam Review 2026–2027 • Practice Resource
, NURS 6501 • Advanced Pathophysiology
Question 6
Which electrolyte abnormality is most commonly associated with cardiac dysrhythmias?
A. Hypermagnesemia
B. Hypercalcemia
C. Hypokalemia
D. Hypernatremia
Correct Answer: C. Hypokalemia
Rationale: Potassium plays a critical role in cardiac conduction and repolarization. Hypokalemia (serum
potassium < 3.5 mEq/L) increases the risk of ventricular arrhythmias, including premature ventricular
contractions, ventricular tachycardia, and torsades de pointes. ECG changes associated with
hypokalemia include flattened T waves, prominent U waves, and ST depression.
Why the other options are incorrect:
A. Hypermagnesemia: While severe hypermagnesemia can cause bradycardia and heart block, it is a
much less common cause of clinically significant dysrhythmias than hypokalemia.
B. Hypercalcemia: Hypercalcemia can cause ECG changes (shortened QT interval) and may increase
digoxin sensitivity, but it is not the most commonly associated electrolyte abnormality with
dysrhythmias.
D. Hypernatremia: Sodium abnormalities primarily affect neurologic function (e.g., altered mental
status, seizures) rather than cardiac conduction.
Section 3: Inflammation and Immunity
────────────────────────────────────────
Question 7
A 35-year-old male with a history of recurrent infections is found to have a genetic defect in the NADPH
oxidase enzyme system in his phagocytes. This defect results in chronic granulomatous disease, which
impairs the ability of phagocytes to:
A. Engulf and internalize bacteria through endocytosis
B. Produce reactive oxygen species needed for intracellular killing of pathogens
C. Present antigens to T lymphocytes via MHC class II molecules
D. Secrete complement proteins that opsonize bacteria
Correct Answer: B. Produce reactive oxygen species needed for intracellular killing of pathogens
Rationale: Chronic granulomatous disease (CGD) results from a defect in NADPH oxidase, the enzyme
responsible for the respiratory burst that generates superoxide and other reactive oxygen species (ROS).
Without ROS, phagocytes can engulf pathogens but cannot efficiently kill catalase-positive organisms
such as Staphylococcus aureus and Aspergillus species.
Why the other options are incorrect:
A. Engulf and internalize bacteria through endocytosis: Phagocytosis (engulfment) remains intact in
CGD. The defect is in intracellular killing, not in the uptake of pathogens.
C. Present antigens to T lymphocytes via MHC class II molecules: Antigen presentation is a function of
antigen-presenting cells and is not impaired by NADPH oxidase deficiency.
D. Secrete complement proteins that opsonize bacteria: Complement proteins are primarily synthesized
by the liver, not by phagocytes. Opsonization by complement is not the defective process in CGD.
────────────────────────────────────────
Final Exam Review 2026–2027 • Practice Resource
