NURS 6501 Comprehensive Pathophysiology Review 2026–2027
NURS 6501 Comprehensive Pathophysiology Review 2026–
2027 Walden University — Advanced Pathophysiology
Professional Exam Preparation & Concept Mastery Guide
Walden University — Advanced Pathophysiology
NURS 6501 Comprehensive Pathophysiology Review 2026–2027 Walden University — Advanced
Pathophysiology
Professional Exam Preparation & Concept Mastery Guide
Table of Contents
Cellular Biology and Membrane Transport
Cellular Adaptation, Injury, and Death
Inflammation and Immunity
Fluid, Electrolyte, and Acid-Base Balance
Cardiovascular Pathophysiology
Respiratory Pathophysiology
Renal and Urinary Pathophysiology
Endocrine and Metabolic Pathophysiology
Neurological Pathophysiology
Section 1: Cellular Biology and Membrane Transport
Question 1
A runner has depleted all available oxygen for muscle energy. Which process facilitates continued muscle
performance in the absence of oxygen?
A) Aerobic glycolysis
B) Oxidative phosphorylation
C) Anaerobic glycolysis
D) Gluconeogenesis
Correct Answer: C
Walden University — Advanced Pathophysiology | Practice Review
, NURS 6501 Comprehensive Pathophysiology Review 2026–2027
Detailed Rationale: Anaerobic glycolysis allows cells to produce adenosine triphosphate (ATP) without
oxygen by converting glucose to pyruvate, then to lactate. This yields only 2 ATP per glucose molecule
compared to 36–38 ATP from aerobic metabolism, but provides rapid energy during oxygen depletion .
Why the Other Options Are Incorrect:
A) Aerobic glycolysis requires oxygen as the final electron acceptor in the electron transport chain.
B) Oxidative phosphorylation occurs in mitochondria and requires oxygen.
D) Gluconeogenesis is the synthesis of glucose from non-carbohydrate sources and does not directly
produce ATP for muscle contraction.
Question 2
What causes the rapid change in resting membrane potential that initiates an action potential?
A) Potassium gates open and potassium rushes out of the cell
B) Sodium gates open and sodium rushes into the cell
C) Calcium gates open and calcium enters the cell
D) Chloride gates open and chloride leaves the cell
Correct Answer: B
Detailed Rationale: Depolarization occurs when voltage-gated sodium channels open in response to
threshold stimulation. Sodium ions flow down their electrochemical gradient into the cell, shifting the
membrane potential from approximately −70 mV toward +30 mV .
Why the Other Options Are Incorrect:
A) Potassium efflux is responsible for repolarization, not depolarization.
C) Calcium influx is important for neurotransmitter release at synapses and muscle contraction, not
rapid neuronal depolarization.
D) Chloride influx typically causes hyperpolarization (inhibition).
Question 3
A patient has a genetic defect causing the sodium-potassium pump 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
Walden University — Advanced Pathophysiology | Practice Review
, NURS 6501 Comprehensive Pathophysiology Review 2026–2027
Detailed Rationale: The Na⁺/K⁺ ATPase pump maintains osmotic balance by pumping three sodium ions
out and two potassium ions into the cell. When the pump fails, sodium accumulates intracellularly,
drawing water in via osmosis, leading to cellular swelling (hydropic degeneration) .
Why the Other Options Are Incorrect:
A) Cellular dehydration would occur if sodium were excessively pumped out, not retained.
C) Reduced pump activity causes depolarization, not hyperpolarization.
D) Endoplasmic reticulum swelling (not increased protein synthesis) occurs during early cell injury.
Question 4
The ion transporter that moves Na⁺ and Ca²⁺ simultaneously in the same direction is an example of which type
of transport?
A) Antiport
B) Symport
C) Uniport
D) Facilitated diffusion
Correct Answer: B
Detailed Rationale: Symport is a type of coupled transport where two or more different molecules or
ions are transported in the same direction across a membrane .
Why the Other Options Are Incorrect:
A) Antiport moves ions in opposite directions (e.g., Na⁺/K⁺ ATPase).
C) Uniport transports a single molecule or ion.
D) Facilitated diffusion uses carrier proteins but does not involve coupled ion movement.
Section 2: Cellular Adaptation, Injury, and Death
Question 5
A 55-year-old male with a 30-pack-year smoking history develops squamous cell carcinoma of the lung. Which
cellular adaptation most commonly precedes this malignancy in bronchial epithelium?
A) Hyperplasia
B) Metaplasia
C) Hypertrophy
D) Dysplasia
Correct Answer: B
Walden University — Advanced Pathophysiology | Practice Review
, NURS 6501 Comprehensive Pathophysiology Review 2026–2027
Detailed Rationale: Chronic exposure to cigarette smoke causes squamous metaplasia, replacing
ciliated columnar epithelium with squamous epithelium. This adaptive change is a precursor to
dysplasia and eventual carcinoma .
Why the Other Options Are Incorrect:
A) Hyperplasia involves an increase in cell number without a change in cell type.
C) Hypertrophy is an increase in cell size without cell division.
D) Dysplasia follows metaplasia and represents disordered growth, but metaplasia is the earlier
adaptive response.
Question 6
Sodium and water accumulation in an injured cell are a direct result of:
A) Increased ATP production
B) Decreased ATP production
C) Increased membrane permeability
D) Decreased membrane permeability
Correct Answer: B
Detailed Rationale: Decreased ATP production impairs the Na⁺/K⁺ pump, causing sodium to accumulate
inside the cell. Water follows sodium by osmosis, leading to cellular swelling .
Why the Other Options Are Incorrect:
A) Increased ATP would enhance pump function, preventing sodium accumulation.
C) Increased permeability can allow sodium entry, but the primary mechanism in ischemic injury is
pump failure from ATP depletion.
D) Decreased permeability would reduce sodium entry.
Question 7
Which principle should the nurse remember when distinguishing aging from disease?
A) Aging is a result of lifestyle choices only
B) It is difficult to distinguish because both processes result from cell injury
C) Aging is reversible, while disease is not
D) Disease only occurs due to genetic mutations
Correct Answer: B
Walden University — Advanced Pathophysiology | Practice Review
NURS 6501 Comprehensive Pathophysiology Review 2026–
2027 Walden University — Advanced Pathophysiology
Professional Exam Preparation & Concept Mastery Guide
Walden University — Advanced Pathophysiology
NURS 6501 Comprehensive Pathophysiology Review 2026–2027 Walden University — Advanced
Pathophysiology
Professional Exam Preparation & Concept Mastery Guide
Table of Contents
Cellular Biology and Membrane Transport
Cellular Adaptation, Injury, and Death
Inflammation and Immunity
Fluid, Electrolyte, and Acid-Base Balance
Cardiovascular Pathophysiology
Respiratory Pathophysiology
Renal and Urinary Pathophysiology
Endocrine and Metabolic Pathophysiology
Neurological Pathophysiology
Section 1: Cellular Biology and Membrane Transport
Question 1
A runner has depleted all available oxygen for muscle energy. Which process facilitates continued muscle
performance in the absence of oxygen?
A) Aerobic glycolysis
B) Oxidative phosphorylation
C) Anaerobic glycolysis
D) Gluconeogenesis
Correct Answer: C
Walden University — Advanced Pathophysiology | Practice Review
, NURS 6501 Comprehensive Pathophysiology Review 2026–2027
Detailed Rationale: Anaerobic glycolysis allows cells to produce adenosine triphosphate (ATP) without
oxygen by converting glucose to pyruvate, then to lactate. This yields only 2 ATP per glucose molecule
compared to 36–38 ATP from aerobic metabolism, but provides rapid energy during oxygen depletion .
Why the Other Options Are Incorrect:
A) Aerobic glycolysis requires oxygen as the final electron acceptor in the electron transport chain.
B) Oxidative phosphorylation occurs in mitochondria and requires oxygen.
D) Gluconeogenesis is the synthesis of glucose from non-carbohydrate sources and does not directly
produce ATP for muscle contraction.
Question 2
What causes the rapid change in resting membrane potential that initiates an action potential?
A) Potassium gates open and potassium rushes out of the cell
B) Sodium gates open and sodium rushes into the cell
C) Calcium gates open and calcium enters the cell
D) Chloride gates open and chloride leaves the cell
Correct Answer: B
Detailed Rationale: Depolarization occurs when voltage-gated sodium channels open in response to
threshold stimulation. Sodium ions flow down their electrochemical gradient into the cell, shifting the
membrane potential from approximately −70 mV toward +30 mV .
Why the Other Options Are Incorrect:
A) Potassium efflux is responsible for repolarization, not depolarization.
C) Calcium influx is important for neurotransmitter release at synapses and muscle contraction, not
rapid neuronal depolarization.
D) Chloride influx typically causes hyperpolarization (inhibition).
Question 3
A patient has a genetic defect causing the sodium-potassium pump 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
Walden University — Advanced Pathophysiology | Practice Review
, NURS 6501 Comprehensive Pathophysiology Review 2026–2027
Detailed Rationale: The Na⁺/K⁺ ATPase pump maintains osmotic balance by pumping three sodium ions
out and two potassium ions into the cell. When the pump fails, sodium accumulates intracellularly,
drawing water in via osmosis, leading to cellular swelling (hydropic degeneration) .
Why the Other Options Are Incorrect:
A) Cellular dehydration would occur if sodium were excessively pumped out, not retained.
C) Reduced pump activity causes depolarization, not hyperpolarization.
D) Endoplasmic reticulum swelling (not increased protein synthesis) occurs during early cell injury.
Question 4
The ion transporter that moves Na⁺ and Ca²⁺ simultaneously in the same direction is an example of which type
of transport?
A) Antiport
B) Symport
C) Uniport
D) Facilitated diffusion
Correct Answer: B
Detailed Rationale: Symport is a type of coupled transport where two or more different molecules or
ions are transported in the same direction across a membrane .
Why the Other Options Are Incorrect:
A) Antiport moves ions in opposite directions (e.g., Na⁺/K⁺ ATPase).
C) Uniport transports a single molecule or ion.
D) Facilitated diffusion uses carrier proteins but does not involve coupled ion movement.
Section 2: Cellular Adaptation, Injury, and Death
Question 5
A 55-year-old male with a 30-pack-year smoking history develops squamous cell carcinoma of the lung. Which
cellular adaptation most commonly precedes this malignancy in bronchial epithelium?
A) Hyperplasia
B) Metaplasia
C) Hypertrophy
D) Dysplasia
Correct Answer: B
Walden University — Advanced Pathophysiology | Practice Review
, NURS 6501 Comprehensive Pathophysiology Review 2026–2027
Detailed Rationale: Chronic exposure to cigarette smoke causes squamous metaplasia, replacing
ciliated columnar epithelium with squamous epithelium. This adaptive change is a precursor to
dysplasia and eventual carcinoma .
Why the Other Options Are Incorrect:
A) Hyperplasia involves an increase in cell number without a change in cell type.
C) Hypertrophy is an increase in cell size without cell division.
D) Dysplasia follows metaplasia and represents disordered growth, but metaplasia is the earlier
adaptive response.
Question 6
Sodium and water accumulation in an injured cell are a direct result of:
A) Increased ATP production
B) Decreased ATP production
C) Increased membrane permeability
D) Decreased membrane permeability
Correct Answer: B
Detailed Rationale: Decreased ATP production impairs the Na⁺/K⁺ pump, causing sodium to accumulate
inside the cell. Water follows sodium by osmosis, leading to cellular swelling .
Why the Other Options Are Incorrect:
A) Increased ATP would enhance pump function, preventing sodium accumulation.
C) Increased permeability can allow sodium entry, but the primary mechanism in ischemic injury is
pump failure from ATP depletion.
D) Decreased permeability would reduce sodium entry.
Question 7
Which principle should the nurse remember when distinguishing aging from disease?
A) Aging is a result of lifestyle choices only
B) It is difficult to distinguish because both processes result from cell injury
C) Aging is reversible, while disease is not
D) Disease only occurs due to genetic mutations
Correct Answer: B
Walden University — Advanced Pathophysiology | Practice Review
