1
WGU D115 Advanced Pathophysiology OA Exam
2026/2027 Actual Exam - 450 Questions with
Detailed Rationales | 100% Verified Graded A+
Pass Guaranteed - A+ Graded
Section 1: Cellular Biology/Genetics
Q1: A patient with a fractured femur presents with muscle wasting in the immobilized leg. Which
cellular adaptation occurred?
A. Hypertrophy
B. Hyperplasia
C. Atrophy [CORRECT]
D. Metaplasia
Correct Answer: C
Rationale: Decreased workload leads to a reduction in cell size (atrophy). Hypertrophy is
increased size, hyperplasia is increased number, and metaplasia is a change in cell type.
Q2: A smoker's bronchial epithelium transforms from ciliated columnar to stratified squamous.
What is this process?
A. Dysplasia
B. Metaplasia [CORRECT]
C. Anaplasia
D. Hyperplasia
Correct Answer: B
Rationale: Metaplasia is a reversible replacement of one mature cell type by another, often due to
chronic irritation like smoking. Dysplasia is abnormal maturation, anaplasia is undifferentiated
proliferation.
Q3: A patient with chronic hypertension has an enlarged left ventricle. This is an example of:
,2
A. Pathologic hypertrophy [CORRECT]
B. Physiologic hypertrophy
C. Hyperplasia
D. Dysplasia
Correct Answer: A
Rationale: Increased afterload causes pathologic hypertrophy via ventricular wall stress.
Physiologic hypertrophy occurs in athletes without disease. Hyperplasia increases cell number.
Q4: A 50-year-old female has endometrial hyperplasia. Which mechanism drives this?
A. Increased estrogen stimulation [CORRECT]
B. Increased progesterone stimulation
C. Decreased estrogen levels
D. Ischemic injury
Correct Answer: A
Rationale: Unopposed estrogen stimulates endometrial cell proliferation (hyperplasia).
Progesterone opposes this effect. Ischemia causes atrophy or necrosis.
Q5: A biopsy reveals disordered cell growth with altered size, shape, and organization, but no
invasion past the basement membrane. This is:
A. Metaplasia
B. Dysplasia [CORRECT]
C. Anaplasia
D. Carcinoma in situ
Correct Answer: B
Rationale: Dysplasia is abnormal, reversible cell maturation within the epithelium. Carcinoma in
situ is severe dysplasia, but dysplasia is the broader, initial term. Anaplasia implies malignancy.
Q6: A patient presents with severe chest pain. ECG shows ST elevation. Lab tests reveal elevated
cardiac troponin. What type of cell death is occurring?
,3
A. Apoptosis
B. Necrosis [CORRECT]
C. Autophagy
D. Atrophy
Correct Answer: B
Rationale: Ischemia from an MI causes ATP depletion, membrane damage, and necrosis,
releasing intracellular enzymes like troponin. Apoptosis is programmed, energy-dependent death
without inflammation.
Q7: Which cellular injury mechanism is most directly responsible for irreversible ischemic
injury?
A. Calcium influx into the cell [CORRECT]
B. Sodium influx
C. Potassium efflux
D. Chloride shift
Correct Answer: A
Rationale: Ischemia causes ATP depletion, stopping the Na/K pump, leading to Na/Ca exchange
reversal. Intracellular calcium activates destructive enzymes (proteases, phospholipases,
endonucleases).
Q8: A child ingests rat poison containing cyanide. What is the primary mechanism of cellular
injury?
A. Inhibition of ATP synthase [CORRECT]
B. Inhibition of Na/K pump
C. Direct DNA damage
D. Free radical generation
Correct Answer: A
Rationale: Cyanide inhibits cytochrome c oxidase in the electron transport chain, halting
oxidative phosphorylation and ATP production. Free radicals cause lipid peroxidation.
, 4
Q9: Reperfusion injury after a myocardial infarction is primarily mediated by:
A. Free radicals [CORRECT]
B. Calcium depletion
C. Apoptosis inhibition
D. Anaerobic glycolysis
Correct Answer: A
Rationale: Return of oxygen generates a massive burst of reactive oxygen species (free radicals)
from mitochondria and neutrophils, causing lipid peroxidation and membrane damage.
Q10: A patient with frostbite has damaged cell membranes. Which lipid component is most
susceptible to freezing injury?
A. Cholesterol
B. Unsaturated fatty acids [CORRECT]
C. Saturated fatty acids
D. Triglycerides
Correct Answer: B
Rationale: Freezing disrupts the lipid bilayer, particularly affecting unsaturated fatty acids which
have kinks that make the membrane fluid and vulnerable to phase transitions.
Q11: Which of the following is a hallmark of apoptosis under electron microscopy?
A. Cell swelling
B. Chromatin condensation [CORRECT]
C. Inflammation
D. Mitochondrial swelling
Correct Answer: B
Rationale: Apoptosis features cell shrinkage, chromatin margination/condensation, and apoptotic
bodies. Necrosis features swelling, inflammation, and mitochondrial flocculent densities.
WGU D115 Advanced Pathophysiology OA Exam
2026/2027 Actual Exam - 450 Questions with
Detailed Rationales | 100% Verified Graded A+
Pass Guaranteed - A+ Graded
Section 1: Cellular Biology/Genetics
Q1: A patient with a fractured femur presents with muscle wasting in the immobilized leg. Which
cellular adaptation occurred?
A. Hypertrophy
B. Hyperplasia
C. Atrophy [CORRECT]
D. Metaplasia
Correct Answer: C
Rationale: Decreased workload leads to a reduction in cell size (atrophy). Hypertrophy is
increased size, hyperplasia is increased number, and metaplasia is a change in cell type.
Q2: A smoker's bronchial epithelium transforms from ciliated columnar to stratified squamous.
What is this process?
A. Dysplasia
B. Metaplasia [CORRECT]
C. Anaplasia
D. Hyperplasia
Correct Answer: B
Rationale: Metaplasia is a reversible replacement of one mature cell type by another, often due to
chronic irritation like smoking. Dysplasia is abnormal maturation, anaplasia is undifferentiated
proliferation.
Q3: A patient with chronic hypertension has an enlarged left ventricle. This is an example of:
,2
A. Pathologic hypertrophy [CORRECT]
B. Physiologic hypertrophy
C. Hyperplasia
D. Dysplasia
Correct Answer: A
Rationale: Increased afterload causes pathologic hypertrophy via ventricular wall stress.
Physiologic hypertrophy occurs in athletes without disease. Hyperplasia increases cell number.
Q4: A 50-year-old female has endometrial hyperplasia. Which mechanism drives this?
A. Increased estrogen stimulation [CORRECT]
B. Increased progesterone stimulation
C. Decreased estrogen levels
D. Ischemic injury
Correct Answer: A
Rationale: Unopposed estrogen stimulates endometrial cell proliferation (hyperplasia).
Progesterone opposes this effect. Ischemia causes atrophy or necrosis.
Q5: A biopsy reveals disordered cell growth with altered size, shape, and organization, but no
invasion past the basement membrane. This is:
A. Metaplasia
B. Dysplasia [CORRECT]
C. Anaplasia
D. Carcinoma in situ
Correct Answer: B
Rationale: Dysplasia is abnormal, reversible cell maturation within the epithelium. Carcinoma in
situ is severe dysplasia, but dysplasia is the broader, initial term. Anaplasia implies malignancy.
Q6: A patient presents with severe chest pain. ECG shows ST elevation. Lab tests reveal elevated
cardiac troponin. What type of cell death is occurring?
,3
A. Apoptosis
B. Necrosis [CORRECT]
C. Autophagy
D. Atrophy
Correct Answer: B
Rationale: Ischemia from an MI causes ATP depletion, membrane damage, and necrosis,
releasing intracellular enzymes like troponin. Apoptosis is programmed, energy-dependent death
without inflammation.
Q7: Which cellular injury mechanism is most directly responsible for irreversible ischemic
injury?
A. Calcium influx into the cell [CORRECT]
B. Sodium influx
C. Potassium efflux
D. Chloride shift
Correct Answer: A
Rationale: Ischemia causes ATP depletion, stopping the Na/K pump, leading to Na/Ca exchange
reversal. Intracellular calcium activates destructive enzymes (proteases, phospholipases,
endonucleases).
Q8: A child ingests rat poison containing cyanide. What is the primary mechanism of cellular
injury?
A. Inhibition of ATP synthase [CORRECT]
B. Inhibition of Na/K pump
C. Direct DNA damage
D. Free radical generation
Correct Answer: A
Rationale: Cyanide inhibits cytochrome c oxidase in the electron transport chain, halting
oxidative phosphorylation and ATP production. Free radicals cause lipid peroxidation.
, 4
Q9: Reperfusion injury after a myocardial infarction is primarily mediated by:
A. Free radicals [CORRECT]
B. Calcium depletion
C. Apoptosis inhibition
D. Anaerobic glycolysis
Correct Answer: A
Rationale: Return of oxygen generates a massive burst of reactive oxygen species (free radicals)
from mitochondria and neutrophils, causing lipid peroxidation and membrane damage.
Q10: A patient with frostbite has damaged cell membranes. Which lipid component is most
susceptible to freezing injury?
A. Cholesterol
B. Unsaturated fatty acids [CORRECT]
C. Saturated fatty acids
D. Triglycerides
Correct Answer: B
Rationale: Freezing disrupts the lipid bilayer, particularly affecting unsaturated fatty acids which
have kinks that make the membrane fluid and vulnerable to phase transitions.
Q11: Which of the following is a hallmark of apoptosis under electron microscopy?
A. Cell swelling
B. Chromatin condensation [CORRECT]
C. Inflammation
D. Mitochondrial swelling
Correct Answer: B
Rationale: Apoptosis features cell shrinkage, chromatin margination/condensation, and apoptotic
bodies. Necrosis features swelling, inflammation, and mitochondrial flocculent densities.
