WESTERN GOVERNORS UNIVERSITY | COLLEGE OF HEALTH PROFESSIONS
WGU PATHOPHYSIOLOGY D236 EXAM PREP
2026/2027
Comprehensive Practice Questions and Answers with Detailed Rationales | Objective Assessment
120 Questions | 11 Content Sections | Answer Key and Pathophysiology Rationale for Every Item | Cognitive Mix: 20% Recall / 50%
Application / 30% Analysis | 2026/2027 Edition
SECTION 1: CELLULAR & MOLECULAR PATHOPHYSIOLOGY (Questions 1-15)
Q1. A 58-year-old man is placed in a plaster cast on his right lower leg for six weeks after a tibial fracture.
When the cast is removed, the right calf measures 3 cm smaller in circumference than the left and is weak on
manual testing, but full strength returns after rehabilitation. Which cellular adaptation best explains the
reduced calf circumference?
A. Hyperplasia, because muscle fibers increased in number during immobility
B. Atrophy, because individual muscle cells shrank in response to the decreased workload [CORRECT]
C. Metaplasia, because skeletal muscle was replaced by fibrous connective tissue
D. Dysplasia, because immobilization produced disordered, atypical muscle cells
Correct Answer: B
Rationale: Reduced mechanical load down-regulates protein synthesis and accelerates protein breakdown, so each
muscle cell decreases in size while remaining viable and capable of full recovery with re-use; this reversible shrinkage is
the definition of atrophy. Hyperplasia is an increase in cell number, metaplasia is replacement of one mature cell type by
another, and dysplasia is disordered, atypical growth, none of which occur in simple disuse.
Q2. A 62-year-old woman with a 15-year history of poorly controlled hypertension undergoes
echocardiography, which shows marked left ventricular wall thickening with a preserved chamber diameter.
Which adaptive mechanism produced this finding?
A. Hyperplasia of cardiac myocytes driven by chronic hypoxia
B. Metaplastic conversion of cardiac muscle into fibrous tissue
C. Dysplastic enlargement of myocytes with nuclear atypia
D. Hypertrophy of individual myocytes that added sarcomeres in response to chronic pressure overload
[CORRECT]
Correct Answer: D
Rationale: Elevated afterload is a workload signal, and because cardiac myocytes cannot divide, they respond by
synthesizing additional sarcomeres in parallel, enlarging each cell without increasing cell number; this is hypertrophy.
Hyperplasia requires cell division, metaplasia substitutes one cell type for another, and dysplasia implies atypical
premalignant change. Left ventricular hypertrophy is the classic D236 example of adaptation that can progress to heart
failure.
1
,WGU Pathophysiology D236 | Objective Assessment Practice Exam 2026/2027
Q3. A 45-year-old woman with obesity and chronic anovulation presents with abnormal uterine bleeding.
Endometrial biopsy reveals an increased number of glandular epithelial cells with uniform, bland nuclei and no
cytologic atypia. Which cellular adaptation is present?
A. Hypertrophy of endometrial gland cells
B. Endometrial glandular hyperplasia driven by unopposed estrogen stimulation [CORRECT]
C. Endometrial metaplasia
D. Apoptosis of endometrial stromal cells
Correct Answer: B
Rationale: Unopposed estrogen acts as a chronic mitogenic stimulus, so the glandular epithelium responds by increasing
cell NUMBER, which is hyperplasia, and the bland cytology confirms it is not dysplasia. Hypertrophy would enlarge
existing cells without multiplying them, metaplasia replaces one mature cell type with another, and apoptosis is
programmed cell death rather than growth. Hormone-driven hyperplasia is a standard D236 application item.
Q4. A 55-year-old man with a 40 pack-year smoking history undergoes bronchoscopy. Biopsy of a segmental
bronchus shows that the normal pseudostratified ciliated columnar epithelium has been replaced by stratified
squamous epithelium; the change is fully reversible if he stops smoking. Which adaptation occurred?
A. Squamous metaplasia, in which a more resistant epithelium replaced the injured ciliated epithelium
[CORRECT]
B. Bronchogenic dysplasia, an irreversible premalignant change
C. Ciliated cell hyperplasia
D. Coagulative necrosis of the bronchial mucosa
Correct Answer: A
Rationale: Chronic tobacco smoke injures fragile ciliated columnar cells, so the airway reprograms to a tougher
stratified squamous lining; this reversible substitution of one mature cell type for another is metaplasia, although
persistent irritation can advance through dysplasia to carcinoma. Dysplasia is atypical premalignant growth rather than
simple substitution, hyperplasia changes cell number but not type, and necrosis is cell death rather than adaptation.
Q5. A routine Pap smear from a 31-year-old woman shows disordered epithelial maturation, increased mitotic
figures, enlarged hyperchromatic nuclei, and cellular atypia that stops short of full-thickness involvement (CIN
2); the change is potentially reversible with treatment. Which term describes this finding?
A. Metaplasia
B. Normal hyperplastic response to inflammation
C. Dysplasia, disordered growth with cytologic atypia [CORRECT]
D. Atrophy
Correct Answer: C
Rationale: Dysplasia combines disordered maturation, nuclear atypia, and increased mitoses within a tissue that remains
organized and potentially reversible, exactly matching a CIN 2 cervical lesion. Metaplasia changes cell type without
atypia, hyperplasia increases cell number with bland cytology, and atrophy is a decrease in cell size or number.
HPV-associated cervical dysplasia is a frequently tested D236 premalignant pathway.
2
,WGU Pathophysiology D236 | Objective Assessment Practice Exam 2026/2027
Q6. A 66-year-old man develops crushing chest pain with ST elevation in the anterior leads; angiography
shows total occlusion of the left anterior descending artery. If the infarcted myocardium is examined
microscopically 24 hours later, which pattern of necrosis is expected?
A. Liquefactive necrosis
B. Caseous necrosis
C. Fat necrosis
D. Coagulative necrosis [CORRECT]
Correct Answer: D
Rationale: Ischemic death in the heart, kidney, and spleen produces coagulative necrosis, in which protein denaturation
preserves the architectural and cell outlines as an anuclear ghost for days after injury. Liquefactive necrosis is typical of
brain infarcts and pyogenic abscesses, caseous necrosis is the granulomatous debris of tuberculosis, and fat necrosis
follows pancreatic lipase release. Matching necrosis type to organ is core D236 cellular injury content.
Q7. Which statement accurately distinguishes apoptosis from necrosis?
A. Apoptosis is an ATP-dependent, caspase-mediated program that fragments the cell into membrane-bound
bodies cleared without inflammation [CORRECT]
B. Apoptosis produces cell swelling, membrane rupture, and vigorous inflammation of the surrounding tissue
C. Necrosis is a tightly regulated genetic program used to remove individual cells quietly
D. Apoptosis always results from severe ischemia and spills lysosomal enzymes into the extracellular space
Correct Answer: A
Rationale: Apoptosis is an energy-requiring suicide program executed by caspases that cleaves DNA and packages
cellular contents inside intact membranes, so no enzymatic leakage or inflammatory response occurs. The swelling,
rupture, and inflammation described in option B define necrosis, option C reverses the two processes, and option D
describes ischemic necrosis rather than programmed death. This distinction is a foundational D236 cell death objective.
Q8. A patient with a large myocardial infarction undergoes successful percutaneous reopening of the occluded
coronary artery, but during the next hour the region of injury extends beyond the original infarct borders.
Which mechanism best explains the additional injury?
A. Recurrent embolization of atherosclerotic debris from the stent
B. Excessive myocardial hypertrophy developing immediately after reperfusion
C. Reperfusion injury generated by reactive oxygen species from re-energized mitochondria and infiltrating
neutrophils [CORRECT]
D. Depletion of intracellular potassium caused by the contrast agent
Correct Answer: C
Rationale: Restoring blood flow re-energizes mitochondria and recruits neutrophils, both of which generate bursts of
reactive oxygen species and inflammatory mediators that attack membranes and extend necrosis; this is reperfusion
injury, the classic D236 example of free-radical pathology. Embolization and contrast effects are not the primary
mechanism, and hypertrophy requires weeks, not minutes. Oxidative stress is an explicitly listed cellular mechanism in the
course blueprint.
3
, WGU Pathophysiology D236 | Objective Assessment Practice Exam 2026/2027
Q9. A renal tubular epithelial cell is rendered hypoxic during an episode of shock. Which morphologic change
represents the earliest, still-reversible stage of hypoxic cell injury?
A. Nuclear pyknosis followed by karyorrhexis
B. Hydropic swelling as the Na+/K+ ATPase pump fails and sodium and water flow into the cell
[CORRECT]
C. Coagulative necrosis of the entire tubule
D. Caseous transformation of the cytoplasm
Correct Answer: B
Rationale: Hypoxia depletes ATP first, so the energy-dependent sodium-potassium pump fails, sodium and water
accumulate intracellularly, potassium diffuses out, and the cell swells while still viable; reoxygenation reverses this
hydropic change. Pyknosis and karyorrhexis are nuclear hallmarks of irreversible death, and coagulative or caseous
necrosis are late end-stage patterns. Pump failure with early cellular swelling is emphasized throughout the D236 injury
module.
Q10. Which microscopic finding in an injured cell indicates that the injury has become IRREVERSIBLE?
A. Cellular swelling with pale, vacuolated cytoplasm
B. Detachment of ribosomes from the rough endoplasmic reticulum
C. Intracellular accumulation of triglyceride droplets (fatty change)
D. Massive mitochondrial vacuolization with membrane damage accompanied by nuclear pyknosis
[CORRECT]
Correct Answer: D
Rationale: Irreversible injury is defined by devastating mitochondrial and plasma membrane damage together with
nuclear condensation and fragmentation; ATP generation is lost permanently and lysosomal enzymes leak, guaranteeing
cell death. Swelling, ribosomal detachment, and fatty change are hallmark reversible alterations. Distinguishing the
reversible from the irreversible checkpoint is a high-yield D236 analysis objective.
Q11. Which pairing correctly matches a cancer-related gene with its mechanism of action?
A. RAS is a gain-of-function oncogene, whereas TP53 is a tumor suppressor gene that must be inactivated at
both alleles to lose growth control [CORRECT]
B. TP53 is a gain-of-function oncogene, whereas RAS suppresses growth until both copies are lost
C. BRCA1 is a dominant oncogene in which one mutated allele is sufficient to cause transformation
D. RAS primarily repairs DNA mismatches during replication
Correct Answer: A
Rationale: Proto-oncogenes such as RAS promote cancer through a single activating mutation that converts them to
gain-of-function drivers, while tumor suppressors such as TP53 and BRCA1 restrain growth and repair DNA and must
be lost at both alleles to release that control. Options B and C reverse or misapply these rules, and DNA mismatch repair is
the role of MLH1/MSH2, not RAS. This oncogene-versus-suppressor logic is an explicit D236 cancer competency.
4
WGU PATHOPHYSIOLOGY D236 EXAM PREP
2026/2027
Comprehensive Practice Questions and Answers with Detailed Rationales | Objective Assessment
120 Questions | 11 Content Sections | Answer Key and Pathophysiology Rationale for Every Item | Cognitive Mix: 20% Recall / 50%
Application / 30% Analysis | 2026/2027 Edition
SECTION 1: CELLULAR & MOLECULAR PATHOPHYSIOLOGY (Questions 1-15)
Q1. A 58-year-old man is placed in a plaster cast on his right lower leg for six weeks after a tibial fracture.
When the cast is removed, the right calf measures 3 cm smaller in circumference than the left and is weak on
manual testing, but full strength returns after rehabilitation. Which cellular adaptation best explains the
reduced calf circumference?
A. Hyperplasia, because muscle fibers increased in number during immobility
B. Atrophy, because individual muscle cells shrank in response to the decreased workload [CORRECT]
C. Metaplasia, because skeletal muscle was replaced by fibrous connective tissue
D. Dysplasia, because immobilization produced disordered, atypical muscle cells
Correct Answer: B
Rationale: Reduced mechanical load down-regulates protein synthesis and accelerates protein breakdown, so each
muscle cell decreases in size while remaining viable and capable of full recovery with re-use; this reversible shrinkage is
the definition of atrophy. Hyperplasia is an increase in cell number, metaplasia is replacement of one mature cell type by
another, and dysplasia is disordered, atypical growth, none of which occur in simple disuse.
Q2. A 62-year-old woman with a 15-year history of poorly controlled hypertension undergoes
echocardiography, which shows marked left ventricular wall thickening with a preserved chamber diameter.
Which adaptive mechanism produced this finding?
A. Hyperplasia of cardiac myocytes driven by chronic hypoxia
B. Metaplastic conversion of cardiac muscle into fibrous tissue
C. Dysplastic enlargement of myocytes with nuclear atypia
D. Hypertrophy of individual myocytes that added sarcomeres in response to chronic pressure overload
[CORRECT]
Correct Answer: D
Rationale: Elevated afterload is a workload signal, and because cardiac myocytes cannot divide, they respond by
synthesizing additional sarcomeres in parallel, enlarging each cell without increasing cell number; this is hypertrophy.
Hyperplasia requires cell division, metaplasia substitutes one cell type for another, and dysplasia implies atypical
premalignant change. Left ventricular hypertrophy is the classic D236 example of adaptation that can progress to heart
failure.
1
,WGU Pathophysiology D236 | Objective Assessment Practice Exam 2026/2027
Q3. A 45-year-old woman with obesity and chronic anovulation presents with abnormal uterine bleeding.
Endometrial biopsy reveals an increased number of glandular epithelial cells with uniform, bland nuclei and no
cytologic atypia. Which cellular adaptation is present?
A. Hypertrophy of endometrial gland cells
B. Endometrial glandular hyperplasia driven by unopposed estrogen stimulation [CORRECT]
C. Endometrial metaplasia
D. Apoptosis of endometrial stromal cells
Correct Answer: B
Rationale: Unopposed estrogen acts as a chronic mitogenic stimulus, so the glandular epithelium responds by increasing
cell NUMBER, which is hyperplasia, and the bland cytology confirms it is not dysplasia. Hypertrophy would enlarge
existing cells without multiplying them, metaplasia replaces one mature cell type with another, and apoptosis is
programmed cell death rather than growth. Hormone-driven hyperplasia is a standard D236 application item.
Q4. A 55-year-old man with a 40 pack-year smoking history undergoes bronchoscopy. Biopsy of a segmental
bronchus shows that the normal pseudostratified ciliated columnar epithelium has been replaced by stratified
squamous epithelium; the change is fully reversible if he stops smoking. Which adaptation occurred?
A. Squamous metaplasia, in which a more resistant epithelium replaced the injured ciliated epithelium
[CORRECT]
B. Bronchogenic dysplasia, an irreversible premalignant change
C. Ciliated cell hyperplasia
D. Coagulative necrosis of the bronchial mucosa
Correct Answer: A
Rationale: Chronic tobacco smoke injures fragile ciliated columnar cells, so the airway reprograms to a tougher
stratified squamous lining; this reversible substitution of one mature cell type for another is metaplasia, although
persistent irritation can advance through dysplasia to carcinoma. Dysplasia is atypical premalignant growth rather than
simple substitution, hyperplasia changes cell number but not type, and necrosis is cell death rather than adaptation.
Q5. A routine Pap smear from a 31-year-old woman shows disordered epithelial maturation, increased mitotic
figures, enlarged hyperchromatic nuclei, and cellular atypia that stops short of full-thickness involvement (CIN
2); the change is potentially reversible with treatment. Which term describes this finding?
A. Metaplasia
B. Normal hyperplastic response to inflammation
C. Dysplasia, disordered growth with cytologic atypia [CORRECT]
D. Atrophy
Correct Answer: C
Rationale: Dysplasia combines disordered maturation, nuclear atypia, and increased mitoses within a tissue that remains
organized and potentially reversible, exactly matching a CIN 2 cervical lesion. Metaplasia changes cell type without
atypia, hyperplasia increases cell number with bland cytology, and atrophy is a decrease in cell size or number.
HPV-associated cervical dysplasia is a frequently tested D236 premalignant pathway.
2
,WGU Pathophysiology D236 | Objective Assessment Practice Exam 2026/2027
Q6. A 66-year-old man develops crushing chest pain with ST elevation in the anterior leads; angiography
shows total occlusion of the left anterior descending artery. If the infarcted myocardium is examined
microscopically 24 hours later, which pattern of necrosis is expected?
A. Liquefactive necrosis
B. Caseous necrosis
C. Fat necrosis
D. Coagulative necrosis [CORRECT]
Correct Answer: D
Rationale: Ischemic death in the heart, kidney, and spleen produces coagulative necrosis, in which protein denaturation
preserves the architectural and cell outlines as an anuclear ghost for days after injury. Liquefactive necrosis is typical of
brain infarcts and pyogenic abscesses, caseous necrosis is the granulomatous debris of tuberculosis, and fat necrosis
follows pancreatic lipase release. Matching necrosis type to organ is core D236 cellular injury content.
Q7. Which statement accurately distinguishes apoptosis from necrosis?
A. Apoptosis is an ATP-dependent, caspase-mediated program that fragments the cell into membrane-bound
bodies cleared without inflammation [CORRECT]
B. Apoptosis produces cell swelling, membrane rupture, and vigorous inflammation of the surrounding tissue
C. Necrosis is a tightly regulated genetic program used to remove individual cells quietly
D. Apoptosis always results from severe ischemia and spills lysosomal enzymes into the extracellular space
Correct Answer: A
Rationale: Apoptosis is an energy-requiring suicide program executed by caspases that cleaves DNA and packages
cellular contents inside intact membranes, so no enzymatic leakage or inflammatory response occurs. The swelling,
rupture, and inflammation described in option B define necrosis, option C reverses the two processes, and option D
describes ischemic necrosis rather than programmed death. This distinction is a foundational D236 cell death objective.
Q8. A patient with a large myocardial infarction undergoes successful percutaneous reopening of the occluded
coronary artery, but during the next hour the region of injury extends beyond the original infarct borders.
Which mechanism best explains the additional injury?
A. Recurrent embolization of atherosclerotic debris from the stent
B. Excessive myocardial hypertrophy developing immediately after reperfusion
C. Reperfusion injury generated by reactive oxygen species from re-energized mitochondria and infiltrating
neutrophils [CORRECT]
D. Depletion of intracellular potassium caused by the contrast agent
Correct Answer: C
Rationale: Restoring blood flow re-energizes mitochondria and recruits neutrophils, both of which generate bursts of
reactive oxygen species and inflammatory mediators that attack membranes and extend necrosis; this is reperfusion
injury, the classic D236 example of free-radical pathology. Embolization and contrast effects are not the primary
mechanism, and hypertrophy requires weeks, not minutes. Oxidative stress is an explicitly listed cellular mechanism in the
course blueprint.
3
, WGU Pathophysiology D236 | Objective Assessment Practice Exam 2026/2027
Q9. A renal tubular epithelial cell is rendered hypoxic during an episode of shock. Which morphologic change
represents the earliest, still-reversible stage of hypoxic cell injury?
A. Nuclear pyknosis followed by karyorrhexis
B. Hydropic swelling as the Na+/K+ ATPase pump fails and sodium and water flow into the cell
[CORRECT]
C. Coagulative necrosis of the entire tubule
D. Caseous transformation of the cytoplasm
Correct Answer: B
Rationale: Hypoxia depletes ATP first, so the energy-dependent sodium-potassium pump fails, sodium and water
accumulate intracellularly, potassium diffuses out, and the cell swells while still viable; reoxygenation reverses this
hydropic change. Pyknosis and karyorrhexis are nuclear hallmarks of irreversible death, and coagulative or caseous
necrosis are late end-stage patterns. Pump failure with early cellular swelling is emphasized throughout the D236 injury
module.
Q10. Which microscopic finding in an injured cell indicates that the injury has become IRREVERSIBLE?
A. Cellular swelling with pale, vacuolated cytoplasm
B. Detachment of ribosomes from the rough endoplasmic reticulum
C. Intracellular accumulation of triglyceride droplets (fatty change)
D. Massive mitochondrial vacuolization with membrane damage accompanied by nuclear pyknosis
[CORRECT]
Correct Answer: D
Rationale: Irreversible injury is defined by devastating mitochondrial and plasma membrane damage together with
nuclear condensation and fragmentation; ATP generation is lost permanently and lysosomal enzymes leak, guaranteeing
cell death. Swelling, ribosomal detachment, and fatty change are hallmark reversible alterations. Distinguishing the
reversible from the irreversible checkpoint is a high-yield D236 analysis objective.
Q11. Which pairing correctly matches a cancer-related gene with its mechanism of action?
A. RAS is a gain-of-function oncogene, whereas TP53 is a tumor suppressor gene that must be inactivated at
both alleles to lose growth control [CORRECT]
B. TP53 is a gain-of-function oncogene, whereas RAS suppresses growth until both copies are lost
C. BRCA1 is a dominant oncogene in which one mutated allele is sufficient to cause transformation
D. RAS primarily repairs DNA mismatches during replication
Correct Answer: A
Rationale: Proto-oncogenes such as RAS promote cancer through a single activating mutation that converts them to
gain-of-function drivers, while tumor suppressors such as TP53 and BRCA1 restrain growth and repair DNA and must
be lost at both alleles to release that control. Options B and C reverse or misapply these rules, and DNA mismatch repair is
the role of MLH1/MSH2, not RAS. This oncogene-versus-suppressor logic is an explicit D236 cancer competency.
4
