WGU D236 Pathophysiology Objective Assessment - 2026/2027 Comprehensive Examination
WGU D236 PATHOPHYSIOLOGY - OBJECTIVE ASSESSMENT
D236 Pathophysiology Objective Assessment
Comprehensive Examination 2026/2027
Western Governors University - Verified Questions and Comprehensive Exam Material
160 Questions with Verified Answers and Detailed Pathophysiological Rationales | Competency-Aligned Objective Assessment
Format | Version 2026/2027
SECTION 1
Cellular and Molecular Pathophysiology (Cell Injury, Inflammation,
Tissue Repair, and Cellular Adaptations)
Q1: A 62-year-old man with a 15-year history of poorly controlled hypertension undergoes an echocardiogram
that reveals marked thickening of the left ventricular wall. The cardiomyocytes are enlarged but remain
structurally organized, and the overall number of cells is unchanged. Which cellular adaptation best explains
this finding?
A. Hyperplasia of cardiac muscle cells
B. Hypertrophy of cardiac muscle cells [CORRECT]
C. Metaplasia of cardiac muscle cells
D. Dysplasia of cardiac muscle cells
Correct Answer: B
Rationale: Chronic hypertension increases cardiac workload, and cardiomyocytes respond to mechanical stress by
increasing in size, which is hypertrophy. Because cardiac myocytes are terminally differentiated, they cannot
undergo mitotic division, so hyperplasia is not possible in this tissue. Metaplasia is replacement of one cell type
by another, and dysplasia is disordered growth, neither of which occurs here. The increased cell size reflects
new contractile proteins and organelles assembled to meet the higher hemodynamic demand.
Q2: Which morphologic change is the earliest recognizable sign of reversible cell injury, and what mechanism
produces it?
A. Coagulative necrosis caused by irreversible lysosomal rupture
B. Fatty change caused by increased ATP synthesis
C. Nuclear pyknosis caused by DNA fragmentation
D. Cellular swelling caused by failure of the sodium-potassium pump [CORRECT]
Correct Answer: D
Rationale: Hypoxic or toxic injury depletes ATP first, and without ATP the sodium-potassium pump fails,
allowing sodium and water to accumulate intracellularly. This produces cellular swelling, the earliest
light-microscopic sign of reversible injury, along with decreased protein synthesis. Coagulative necrosis and
nuclear pyknosis are features of irreversible, not reversible, injury. Fatty change results from impaired lipid
metabolism rather than increased ATP synthesis.
1
,WGU D236 Pathophysiology Objective Assessment - 2026/2027 Comprehensive Examination
Q3: A 58-year-old man suffers an acute occlusion of the left anterior descending coronary artery and dies two
days later. Autopsy of the infarcted myocardium shows an area of firm, pale, dead tissue in which the basic
tissue architecture and cell outlines are preserved despite coagulation of cytoplasmic proteins. Which type of
necrosis is this?
A. Liquefactive necrosis
B. Caseous necrosis
C. Coagulative necrosis [CORRECT]
D. Fat necrosis
Correct Answer: C
Rationale: Coagulative necrosis is the characteristic form of ischemic death in solid organs such as the heart,
kidney, and spleen, in which protein denaturation preserves tissue architecture for several days. Liquefactive
necrosis occurs in the brain and in bacterial abscesses where enzymatic digestion dominates. Caseous necrosis is
associated with granulomatous diseases such as tuberculosis, and fat necrosis occurs in pancreatic injury when
lipases damage adipose tissue.
Q4: A bronchial biopsy from a 55-year-old heavy smoker shows that the normal pseudostratified ciliated
columnar epithelium has been replaced by stratified squamous epithelium. The cells are otherwise well
organized and no atypical mitotic figures are present. Which cellular adaptation has occurred, and what is its
clinical significance?
A. Hyperplasia, which is a premalignant irreversible change
B. Metaplasia, which is reversible but predisposes to squamous cell carcinoma [CORRECT]
C. Dysplasia, which always progresses to invasive cancer
D. Hypertrophy, which restores normal mucosal protection
Correct Answer: B
Rationale: Chronic irritation from tobacco smoke induces metaplasia, the reversible replacement of one mature
cell type by another better able to withstand the insult. The new squamous epithelium is tough but loses cilia and
mucus production, reducing mucociliary clearance. If the exposure continues, metaplasia can progress through
dysplasia to squamous cell carcinoma, which is why smoking cessation is emphasized. Dysplasia and
irreversible premalignant change are not present in this well-ordered epithelium.
Q5: Which statement best characterizes apoptosis as distinct from necrosis?
A. Apoptosis causes cell swelling, membrane rupture, and intense inflammation
B. Apoptosis always requires ATP depletion and mitochondrial rupture
C. Apoptosis is caspase-mediated single-cell death without inflammation [CORRECT]
D. Apoptosis releases lysosomal enzymes that damage neighboring cells
Correct Answer: C
Rationale: Apoptosis is a genetically programmed, energy-dependent form of cell suicide executed by caspase
enzymes that fragment DNA and dismantle the cell into apoptotic bodies. Because the plasma membrane
remains intact until the fragments are phagocytosed, there is no enzyme leakage and no inflammatory response.
Necrosis, by contrast, involves cell swelling, membrane rupture, and spillover of contents that trigger vigorous
inflammation. ATP depletion and lysosomal release are hallmarks of necrotic, not apoptotic, death.
2
,WGU D236 Pathophysiology Objective Assessment - 2026/2027 Comprehensive Examination
Q6: Following successful coronary reperfusion with balloon angioplasty, a patient's myocardial injury actually
worsens over the next 24 hours despite restored blood flow. Which mechanism best explains this reperfusion
injury?
A. Persistent total ischemia of the reperfused territory
B. Generation of reactive oxygen species and neutrophil-mediated damage [CORRECT]
C. Excess ATP production causing calcium depletion
D. Loss of inflammatory mediators in the reperfused tissue
Correct Answer: B
Rationale: Restoration of blood flow floods the previously ischemic tissue with oxygen, and damaged mitochondria
incompletely reduce that oxygen, generating large quantities of reactive oxygen species. Reperfusion also
recruits neutrophils that release proteases and more free radicals, and it produces calcium overload that further
injures mitochondria. This is why laboratory markers and infarct size can worsen transiently after successful
reopening of the vessel. The other options contradict the restoration of flow or the known biology of
reperfusion.
Q7: A patient stung by a bee rapidly develops a wheal-and-flare reaction with localized redness, warmth, and
itching. Which chemical mediator primarily produces the early vascular changes in this acute inflammatory
response?
A. Vasodilation and increased venular permeability caused by histamine [CORRECT]
B. Prolonged coagulation caused by complement C3b opsonization
C. Neutrophil chemotaxis caused by tumor necrosis factor-alpha
D. Fibrosis caused by transforming growth factor-beta
Correct Answer: A
Rationale: Histamine released from mast cell granules binds H1 receptors and rapidly dilates arterioles while
increasing permeability of venules, producing the redness, warmth, and swelling of the wheal-and-flare
response. C3b is an opsonin for phagocytosis and does not mediate vascular changes. TNF-alpha and other
cytokines contribute to later recruitment of leukocytes, and TGF-beta drives fibrosis during chronic repair, not
the immediate response.
Q8: A 34-year-old immigrant presents with chronic cough, night sweats, and weight loss. Biopsy of a lung
lesion shows central amorphous debris surrounded by epithelioid macrophages, Langhans giant cells, and
lymphocytes. Which pattern of inflammation and underlying mechanism does this represent?
A. Acute purulent inflammation driven by neutrophils and pus formation
B. Granulomatous chronic inflammation driven by Th1 cell-mediated immunity [CORRECT]
C. Type I hypersensitivity driven by IgE and mast cell degranulation
D. Serous inflammation driven by plasma leakage into serous cavities
Correct Answer: B
Rationale: The caseating granuloma is the classic lesion of tuberculosis and represents chronic granulomatous
inflammation. Interferon-gamma from activated Th1 CD4+ T cells activates macrophages to become
epithelioid cells and to fuse into Langhans giant cells, walling off the indigestible mycobacteria.
Neutrophil-driven purulent inflammation is typical of pyogenic bacterial abscesses, not TB. Type I
hypersensitivity and serous inflammation do not produce caseating granulomas.
3
, WGU D236 Pathophysiology Objective Assessment - 2026/2027 Comprehensive Examination
Q9: Which of the following correctly lists the five cardinal signs of acute inflammation along with a correct
physiologic basis for at least one of them?
A. Rubor, tumor, calor, dolor, and functio laesa, with rubor resulting from arteriolar
vasodilation [CORRECT]
B. Fever, leukocytosis, anorexia, malaise, and tachycardia, with fever resulting from bradykinin
C. Rubor, pallor, calor, dolor, and rigidity, with pallor resulting from venous constriction
D. Tumor, ulceration, fistula, hemorrhage, and necrosis, with tumor resulting from cell hyperplasia
Correct Answer: A
Rationale: The five cardinal signs are redness (rubor), swelling (tumor), heat (calor), pain (dolor), and loss of
function (functio laesa). Redness and heat arise when histamine and prostaglandins dilate arterioles and increase
blood flow to the injured tissue, while swelling results from increased vascular permeability with exudation of
protein-rich fluid. Fever, leukocytosis, and malaise are systemic responses rather than cardinal local signs.
Tumor in this context means swelling from edema, not neoplastic growth.
Q10: A patient with a bacterial infection develops a temperature of 39.2 degrees Celsius along with chills and
malaise. Which mechanism best explains the pathogenesis of this fever?
A. Exogenous pyrogens directly reset the hypothalamic thermostat
B. Bradykinin acts on the anterior pituitary to raise the thermoregulatory set point
C. Histamine-induced vasodilation increases core body temperature
D. Interleukin-1 and tumor necrosis factor stimulate hypothalamic prostaglandin E2
synthesis [CORRECT]
Correct Answer: D
Rationale: Endogenous pyrogens such as IL-1, TNF-alpha, and IL-6 released by leukocytes travel to the
hypothalamus and induce cyclooxygenase-mediated production of prostaglandin E2. PGE2 raises the
thermoregulatory set point, so the body generates heat through shivering and vasoconstriction until the new set
point is reached. Exogenous pyrogens such as bacterial LPS act indirectly by stimulating endogenous pyrogen
release. NSAIDs and acetaminophen reduce fever by blocking PGE2 synthesis, which confirms the central role
of this pathway.
Q11: A surgical abdominal wound examined on day 5 shows pink, soft tissue filling the defect, composed of
proliferating fibroblasts, new capillary buds, macrophages, and loose extracellular matrix. Which phase of
wound healing does this represent, and what is this tissue called?
A. Proliferative phase with formation of granulation tissue [CORRECT]
B. Hemostatic phase with formation of a platelet plug
C. Inflammatory phase with formation of a serous exudate
D. Remodeling phase with formation of mature scar
Correct Answer: A
Rationale: Granulation tissue is the hallmark of the proliferative phase of wound repair, containing new capillaries,
fibroblasts depositing type III collagen, and macrophages that clear debris. It progressively fills the wound and
provides the substrate for subsequent collagen deposition. The hemostatic and inflammatory phases precede it,
while the remodeling phase follows with conversion to type I collagen and scar maturation. Recognition of
granulation tissue is essential for distinguishing normal healing from chronic nonhealing wounds.
4
WGU D236 PATHOPHYSIOLOGY - OBJECTIVE ASSESSMENT
D236 Pathophysiology Objective Assessment
Comprehensive Examination 2026/2027
Western Governors University - Verified Questions and Comprehensive Exam Material
160 Questions with Verified Answers and Detailed Pathophysiological Rationales | Competency-Aligned Objective Assessment
Format | Version 2026/2027
SECTION 1
Cellular and Molecular Pathophysiology (Cell Injury, Inflammation,
Tissue Repair, and Cellular Adaptations)
Q1: A 62-year-old man with a 15-year history of poorly controlled hypertension undergoes an echocardiogram
that reveals marked thickening of the left ventricular wall. The cardiomyocytes are enlarged but remain
structurally organized, and the overall number of cells is unchanged. Which cellular adaptation best explains
this finding?
A. Hyperplasia of cardiac muscle cells
B. Hypertrophy of cardiac muscle cells [CORRECT]
C. Metaplasia of cardiac muscle cells
D. Dysplasia of cardiac muscle cells
Correct Answer: B
Rationale: Chronic hypertension increases cardiac workload, and cardiomyocytes respond to mechanical stress by
increasing in size, which is hypertrophy. Because cardiac myocytes are terminally differentiated, they cannot
undergo mitotic division, so hyperplasia is not possible in this tissue. Metaplasia is replacement of one cell type
by another, and dysplasia is disordered growth, neither of which occurs here. The increased cell size reflects
new contractile proteins and organelles assembled to meet the higher hemodynamic demand.
Q2: Which morphologic change is the earliest recognizable sign of reversible cell injury, and what mechanism
produces it?
A. Coagulative necrosis caused by irreversible lysosomal rupture
B. Fatty change caused by increased ATP synthesis
C. Nuclear pyknosis caused by DNA fragmentation
D. Cellular swelling caused by failure of the sodium-potassium pump [CORRECT]
Correct Answer: D
Rationale: Hypoxic or toxic injury depletes ATP first, and without ATP the sodium-potassium pump fails,
allowing sodium and water to accumulate intracellularly. This produces cellular swelling, the earliest
light-microscopic sign of reversible injury, along with decreased protein synthesis. Coagulative necrosis and
nuclear pyknosis are features of irreversible, not reversible, injury. Fatty change results from impaired lipid
metabolism rather than increased ATP synthesis.
1
,WGU D236 Pathophysiology Objective Assessment - 2026/2027 Comprehensive Examination
Q3: A 58-year-old man suffers an acute occlusion of the left anterior descending coronary artery and dies two
days later. Autopsy of the infarcted myocardium shows an area of firm, pale, dead tissue in which the basic
tissue architecture and cell outlines are preserved despite coagulation of cytoplasmic proteins. Which type of
necrosis is this?
A. Liquefactive necrosis
B. Caseous necrosis
C. Coagulative necrosis [CORRECT]
D. Fat necrosis
Correct Answer: C
Rationale: Coagulative necrosis is the characteristic form of ischemic death in solid organs such as the heart,
kidney, and spleen, in which protein denaturation preserves tissue architecture for several days. Liquefactive
necrosis occurs in the brain and in bacterial abscesses where enzymatic digestion dominates. Caseous necrosis is
associated with granulomatous diseases such as tuberculosis, and fat necrosis occurs in pancreatic injury when
lipases damage adipose tissue.
Q4: A bronchial biopsy from a 55-year-old heavy smoker shows that the normal pseudostratified ciliated
columnar epithelium has been replaced by stratified squamous epithelium. The cells are otherwise well
organized and no atypical mitotic figures are present. Which cellular adaptation has occurred, and what is its
clinical significance?
A. Hyperplasia, which is a premalignant irreversible change
B. Metaplasia, which is reversible but predisposes to squamous cell carcinoma [CORRECT]
C. Dysplasia, which always progresses to invasive cancer
D. Hypertrophy, which restores normal mucosal protection
Correct Answer: B
Rationale: Chronic irritation from tobacco smoke induces metaplasia, the reversible replacement of one mature
cell type by another better able to withstand the insult. The new squamous epithelium is tough but loses cilia and
mucus production, reducing mucociliary clearance. If the exposure continues, metaplasia can progress through
dysplasia to squamous cell carcinoma, which is why smoking cessation is emphasized. Dysplasia and
irreversible premalignant change are not present in this well-ordered epithelium.
Q5: Which statement best characterizes apoptosis as distinct from necrosis?
A. Apoptosis causes cell swelling, membrane rupture, and intense inflammation
B. Apoptosis always requires ATP depletion and mitochondrial rupture
C. Apoptosis is caspase-mediated single-cell death without inflammation [CORRECT]
D. Apoptosis releases lysosomal enzymes that damage neighboring cells
Correct Answer: C
Rationale: Apoptosis is a genetically programmed, energy-dependent form of cell suicide executed by caspase
enzymes that fragment DNA and dismantle the cell into apoptotic bodies. Because the plasma membrane
remains intact until the fragments are phagocytosed, there is no enzyme leakage and no inflammatory response.
Necrosis, by contrast, involves cell swelling, membrane rupture, and spillover of contents that trigger vigorous
inflammation. ATP depletion and lysosomal release are hallmarks of necrotic, not apoptotic, death.
2
,WGU D236 Pathophysiology Objective Assessment - 2026/2027 Comprehensive Examination
Q6: Following successful coronary reperfusion with balloon angioplasty, a patient's myocardial injury actually
worsens over the next 24 hours despite restored blood flow. Which mechanism best explains this reperfusion
injury?
A. Persistent total ischemia of the reperfused territory
B. Generation of reactive oxygen species and neutrophil-mediated damage [CORRECT]
C. Excess ATP production causing calcium depletion
D. Loss of inflammatory mediators in the reperfused tissue
Correct Answer: B
Rationale: Restoration of blood flow floods the previously ischemic tissue with oxygen, and damaged mitochondria
incompletely reduce that oxygen, generating large quantities of reactive oxygen species. Reperfusion also
recruits neutrophils that release proteases and more free radicals, and it produces calcium overload that further
injures mitochondria. This is why laboratory markers and infarct size can worsen transiently after successful
reopening of the vessel. The other options contradict the restoration of flow or the known biology of
reperfusion.
Q7: A patient stung by a bee rapidly develops a wheal-and-flare reaction with localized redness, warmth, and
itching. Which chemical mediator primarily produces the early vascular changes in this acute inflammatory
response?
A. Vasodilation and increased venular permeability caused by histamine [CORRECT]
B. Prolonged coagulation caused by complement C3b opsonization
C. Neutrophil chemotaxis caused by tumor necrosis factor-alpha
D. Fibrosis caused by transforming growth factor-beta
Correct Answer: A
Rationale: Histamine released from mast cell granules binds H1 receptors and rapidly dilates arterioles while
increasing permeability of venules, producing the redness, warmth, and swelling of the wheal-and-flare
response. C3b is an opsonin for phagocytosis and does not mediate vascular changes. TNF-alpha and other
cytokines contribute to later recruitment of leukocytes, and TGF-beta drives fibrosis during chronic repair, not
the immediate response.
Q8: A 34-year-old immigrant presents with chronic cough, night sweats, and weight loss. Biopsy of a lung
lesion shows central amorphous debris surrounded by epithelioid macrophages, Langhans giant cells, and
lymphocytes. Which pattern of inflammation and underlying mechanism does this represent?
A. Acute purulent inflammation driven by neutrophils and pus formation
B. Granulomatous chronic inflammation driven by Th1 cell-mediated immunity [CORRECT]
C. Type I hypersensitivity driven by IgE and mast cell degranulation
D. Serous inflammation driven by plasma leakage into serous cavities
Correct Answer: B
Rationale: The caseating granuloma is the classic lesion of tuberculosis and represents chronic granulomatous
inflammation. Interferon-gamma from activated Th1 CD4+ T cells activates macrophages to become
epithelioid cells and to fuse into Langhans giant cells, walling off the indigestible mycobacteria.
Neutrophil-driven purulent inflammation is typical of pyogenic bacterial abscesses, not TB. Type I
hypersensitivity and serous inflammation do not produce caseating granulomas.
3
, WGU D236 Pathophysiology Objective Assessment - 2026/2027 Comprehensive Examination
Q9: Which of the following correctly lists the five cardinal signs of acute inflammation along with a correct
physiologic basis for at least one of them?
A. Rubor, tumor, calor, dolor, and functio laesa, with rubor resulting from arteriolar
vasodilation [CORRECT]
B. Fever, leukocytosis, anorexia, malaise, and tachycardia, with fever resulting from bradykinin
C. Rubor, pallor, calor, dolor, and rigidity, with pallor resulting from venous constriction
D. Tumor, ulceration, fistula, hemorrhage, and necrosis, with tumor resulting from cell hyperplasia
Correct Answer: A
Rationale: The five cardinal signs are redness (rubor), swelling (tumor), heat (calor), pain (dolor), and loss of
function (functio laesa). Redness and heat arise when histamine and prostaglandins dilate arterioles and increase
blood flow to the injured tissue, while swelling results from increased vascular permeability with exudation of
protein-rich fluid. Fever, leukocytosis, and malaise are systemic responses rather than cardinal local signs.
Tumor in this context means swelling from edema, not neoplastic growth.
Q10: A patient with a bacterial infection develops a temperature of 39.2 degrees Celsius along with chills and
malaise. Which mechanism best explains the pathogenesis of this fever?
A. Exogenous pyrogens directly reset the hypothalamic thermostat
B. Bradykinin acts on the anterior pituitary to raise the thermoregulatory set point
C. Histamine-induced vasodilation increases core body temperature
D. Interleukin-1 and tumor necrosis factor stimulate hypothalamic prostaglandin E2
synthesis [CORRECT]
Correct Answer: D
Rationale: Endogenous pyrogens such as IL-1, TNF-alpha, and IL-6 released by leukocytes travel to the
hypothalamus and induce cyclooxygenase-mediated production of prostaglandin E2. PGE2 raises the
thermoregulatory set point, so the body generates heat through shivering and vasoconstriction until the new set
point is reached. Exogenous pyrogens such as bacterial LPS act indirectly by stimulating endogenous pyrogen
release. NSAIDs and acetaminophen reduce fever by blocking PGE2 synthesis, which confirms the central role
of this pathway.
Q11: A surgical abdominal wound examined on day 5 shows pink, soft tissue filling the defect, composed of
proliferating fibroblasts, new capillary buds, macrophages, and loose extracellular matrix. Which phase of
wound healing does this represent, and what is this tissue called?
A. Proliferative phase with formation of granulation tissue [CORRECT]
B. Hemostatic phase with formation of a platelet plug
C. Inflammatory phase with formation of a serous exudate
D. Remodeling phase with formation of mature scar
Correct Answer: A
Rationale: Granulation tissue is the hallmark of the proliferative phase of wound repair, containing new capillaries,
fibroblasts depositing type III collagen, and macrophages that clear debris. It progressively fills the wound and
provides the substrate for subsequent collagen deposition. The hemostatic and inflammatory phases precede it,
while the remodeling phase follows with conversion to type I collagen and scar maturation. Recognition of
granulation tissue is essential for distinguishing normal healing from chronic nonhealing wounds.
4
