WGU D115 OA ADVANCED PATHOPHYSIOLOGY
EXAM 2026 | ACTUAL OA QUESTIONS & DETAILED
ANSWERS | WGU D115 OBJECTIVE ASSESSMENT
READINESS PRACTICE EXAM STUDY GUIDE
• This practice exam mirrors the WGU D115 OA format — use it by answering
each question independently before checking the correct answer and EXPERT
RATIONALE to reinforce active recall and deepen pathophysiological
reasoning.
• Features include bolded questions, bolded correct answers, lettered options
A–E, and detailed EXPERT RATIONALE — making this a complete self-study tool
for OA readiness.
WGU D115 — ADVANCED PATHOPHYSIOLOGY
2026 OBJECTIVE ASSESSMENT READINESS PRACTICE EXAM
200 Questions | Complete Study Guide
1. A patient has chronically elevated blood pressure. Which cellular
adaptation best explains the resulting increase in cardiac muscle mass?
A. Hyperplasia
B. Metaplasia
C. Atrophy
D. Dysplasia
E. Hypertrophy
Correct Answer: E. Hypertrophy
EXPERT RATIONALE: Hypertrophy is an increase in cell size in response to
increased workload. Cardiac muscle cells cannot divide, so they enlarge
(hypertrophy) in response to chronic pressure overload from hypertension, leading
to increased ventricular wall mass.
,2. A smoker's bronchial epithelium transitions from columnar to squamous
cells over time. This cellular change is called:
A. Hypertrophy
B. Hyperplasia
C. Dysplasia
D. Metaplasia
E. Neoplasia
Correct Answer: D. Metaplasia
EXPERT RATIONALE: Metaplasia is the reversible replacement of one mature cell
type with another. In smokers, chronic irritation causes columnar bronchial
epithelium to convert to squamous epithelium, which is more resistant to irritation
but loses ciliary function.
3. A cell undergoes programmed, energy-dependent death without triggering
inflammation. This process is:
A. Liquefactive necrosis
B. Apoptosis
C. Coagulative necrosis
D. Caseous necrosis
E. Gangrene
Correct Answer: B. Apoptosis
EXPERT RATIONALE: Apoptosis is programmed cell death involving caspase
activation, DNA fragmentation, and formation of apoptotic bodies. It does not
trigger inflammation because contents are contained within membrane-bound
vesicles and cleared by phagocytes.
,4. Following a myocardial infarction, the infarcted tissue maintains its
structural outline but cells are dead. This type of necrosis is:
A. Caseous necrosis
B. Fat necrosis
C. Liquefactive necrosis
D. Fibrinoid necrosis
E. Coagulative necrosis
Correct Answer: E. Coagulative necrosis
EXPERT RATIONALE: Coagulative necrosis preserves the structural architecture of
dead tissue for days because denatured proteins resist proteolysis. It is the
hallmark of ischemic injury in solid organs such as the heart and kidney.
5. A patient with tuberculosis has a chest X-ray showing cheese-like necrotic
material in the lung. This finding represents:
A. Liquefactive necrosis
B. Fat necrosis
C. Fibrinoid necrosis
D. Caseous necrosis
E. Coagulative necrosis
Correct Answer: D. Caseous necrosis
EXPERT RATIONALE: Caseous necrosis is characteristic of tuberculosis and fungal
infections. Histologically it appears as amorphous, granular, cheese-like debris
surrounded by granulomatous inflammation. It is a combination of coagulative and
liquefactive necrosis.
, 6. Which of the following is an early reversible sign of cell injury seen on
electron microscopy?
A. Nuclear pyknosis
B. Membrane rupture
C. Mitochondrial swelling
D. Karyorrhexis
E. Karyolysis
Correct Answer: C. Mitochondrial swelling
EXPERT RATIONALE: Early reversible cell injury causes decreased ATP production,
leading to failure of the Na⁺/K⁺-ATPase pump, cellular swelling, and mitochondrial
swelling. These changes are reversible if the injurious stimulus is removed early.
Nuclear changes (pyknosis, karyorrhexis, karyolysis) indicate irreversible injury.
7. A patient sustained a brain infarct. The necrotic tissue becomes soft and
liquefied. This is consistent with:
A. Coagulative necrosis
B. Caseous necrosis
C. Fat necrosis
D. Liquefactive necrosis
E. Fibrinoid necrosis
Correct Answer: D. Liquefactive necrosis
EXPERT RATIONALE: The brain undergoes liquefactive necrosis after ischemic
injury because it has a high lipid content and abundant hydrolytic enzymes.
Neutrophils and macrophages digest the dead tissue, producing a liquid cystic
mass.
EXAM 2026 | ACTUAL OA QUESTIONS & DETAILED
ANSWERS | WGU D115 OBJECTIVE ASSESSMENT
READINESS PRACTICE EXAM STUDY GUIDE
• This practice exam mirrors the WGU D115 OA format — use it by answering
each question independently before checking the correct answer and EXPERT
RATIONALE to reinforce active recall and deepen pathophysiological
reasoning.
• Features include bolded questions, bolded correct answers, lettered options
A–E, and detailed EXPERT RATIONALE — making this a complete self-study tool
for OA readiness.
WGU D115 — ADVANCED PATHOPHYSIOLOGY
2026 OBJECTIVE ASSESSMENT READINESS PRACTICE EXAM
200 Questions | Complete Study Guide
1. A patient has chronically elevated blood pressure. Which cellular
adaptation best explains the resulting increase in cardiac muscle mass?
A. Hyperplasia
B. Metaplasia
C. Atrophy
D. Dysplasia
E. Hypertrophy
Correct Answer: E. Hypertrophy
EXPERT RATIONALE: Hypertrophy is an increase in cell size in response to
increased workload. Cardiac muscle cells cannot divide, so they enlarge
(hypertrophy) in response to chronic pressure overload from hypertension, leading
to increased ventricular wall mass.
,2. A smoker's bronchial epithelium transitions from columnar to squamous
cells over time. This cellular change is called:
A. Hypertrophy
B. Hyperplasia
C. Dysplasia
D. Metaplasia
E. Neoplasia
Correct Answer: D. Metaplasia
EXPERT RATIONALE: Metaplasia is the reversible replacement of one mature cell
type with another. In smokers, chronic irritation causes columnar bronchial
epithelium to convert to squamous epithelium, which is more resistant to irritation
but loses ciliary function.
3. A cell undergoes programmed, energy-dependent death without triggering
inflammation. This process is:
A. Liquefactive necrosis
B. Apoptosis
C. Coagulative necrosis
D. Caseous necrosis
E. Gangrene
Correct Answer: B. Apoptosis
EXPERT RATIONALE: Apoptosis is programmed cell death involving caspase
activation, DNA fragmentation, and formation of apoptotic bodies. It does not
trigger inflammation because contents are contained within membrane-bound
vesicles and cleared by phagocytes.
,4. Following a myocardial infarction, the infarcted tissue maintains its
structural outline but cells are dead. This type of necrosis is:
A. Caseous necrosis
B. Fat necrosis
C. Liquefactive necrosis
D. Fibrinoid necrosis
E. Coagulative necrosis
Correct Answer: E. Coagulative necrosis
EXPERT RATIONALE: Coagulative necrosis preserves the structural architecture of
dead tissue for days because denatured proteins resist proteolysis. It is the
hallmark of ischemic injury in solid organs such as the heart and kidney.
5. A patient with tuberculosis has a chest X-ray showing cheese-like necrotic
material in the lung. This finding represents:
A. Liquefactive necrosis
B. Fat necrosis
C. Fibrinoid necrosis
D. Caseous necrosis
E. Coagulative necrosis
Correct Answer: D. Caseous necrosis
EXPERT RATIONALE: Caseous necrosis is characteristic of tuberculosis and fungal
infections. Histologically it appears as amorphous, granular, cheese-like debris
surrounded by granulomatous inflammation. It is a combination of coagulative and
liquefactive necrosis.
, 6. Which of the following is an early reversible sign of cell injury seen on
electron microscopy?
A. Nuclear pyknosis
B. Membrane rupture
C. Mitochondrial swelling
D. Karyorrhexis
E. Karyolysis
Correct Answer: C. Mitochondrial swelling
EXPERT RATIONALE: Early reversible cell injury causes decreased ATP production,
leading to failure of the Na⁺/K⁺-ATPase pump, cellular swelling, and mitochondrial
swelling. These changes are reversible if the injurious stimulus is removed early.
Nuclear changes (pyknosis, karyorrhexis, karyolysis) indicate irreversible injury.
7. A patient sustained a brain infarct. The necrotic tissue becomes soft and
liquefied. This is consistent with:
A. Coagulative necrosis
B. Caseous necrosis
C. Fat necrosis
D. Liquefactive necrosis
E. Fibrinoid necrosis
Correct Answer: D. Liquefactive necrosis
EXPERT RATIONALE: The brain undergoes liquefactive necrosis after ischemic
injury because it has a high lipid content and abundant hydrolytic enzymes.
Neutrophils and macrophages digest the dead tissue, producing a liquid cystic
mass.
