WGU D115 OA PREP TEST BANK 2026/2027 | Real Exam
Questions and Correct Answers with Rationales | Advanced
Pathophysiology Objective Assessment | New | Pass
Guaranteed - A+ Graded
SECTION 1: CELLULAR FUNCTION, ADAPTATION & INJURY (25 Questions)
Q1: A 68-year-old male with a history of benign prostatic hyperplasia presents with
urinary retention leading to bilateral hydronephrosis. Renal biopsy reveals enlarged
tubular epithelial cells with large vacuoles displacing the nucleus to the periphery.
Which cellular adaptation is demonstrated?
A. Hypertrophy
B. Hyperplasia
C. Hydropic change (cellular swelling)
D. Fatty change (steatosis) [CORRECT]
Correct Answer: D
Rationale: The histological description of enlarged cells with clear vacuoles displacing
the nucleus peripherally is characteristic of fatty change (steatosis), where triglycerides
,accumulate in parenchymal cells. In this case, the hydronephrosis causes renal tubular
epithelial injury, impairing fatty acid metabolism and leading to lipid accumulation.
Hypertrophy (A) involves increased cell size without vacuole formation. Hyperplasia (B)
involves increased cell number, not individual cell enlargement with vacuoles. Hydropic
change (C) produces clear vacuoles but represents water accumulation (cloudy
swelling), not lipid displacement of the nucleus. The "signet ring" appearance is
pathognomonic for steatosis.
Q2: A 45-year-old woman undergoes bilateral mastectomy with immediate
reconstruction. Six months postoperatively, histology of the rectus abdominis muscle
used for flap reconstruction shows increased fiber size with increased number of
myofibrils per cell. This represents which adaptive response?
A. Physiologic atrophy
B. Compensatory hypertrophy
C. Denervation atrophy
D. Metaplasia [CORRECT]
Correct Answer: B
Rationale: The rectus abdominis muscle demonstrates compensatory hypertrophy—an
increase in cell size (not number) resulting from increased workload during the healing
and functional adaptation phase. The increased myofibril count confirms true
,hypertrophy rather than edema. Physiologic atrophy (A) occurs with aging or disuse and
would show decreased fiber size. Denervation atrophy (C) produces small, angular
fibers with fiber-type grouping. Metaplasia (D) involves transformation to a different cell
type, not enlargement of the same cell type. This represents an adaptive response to
increased functional demand on the transferred muscle.
Q3: A chronic smoker's bronchial epithelium demonstrates transformation from
pseudostratified ciliated columnar epithelium to stratified squamous epithelium. This
change increases resistance to irritation but compromises mucociliary clearance.
Which cellular adaptation is described?
A. Dysplasia
B. Anaplasia
C. Metaplasia [CORRECT]
D. Hyperplasia
Correct Answer: C
Rationale: Metaplasia is the reversible replacement of one differentiated cell type by
another, typically occurring in response to chronic irritation. The transformation to
squamous epithelium provides better protection against chemical injury but sacrifices
normal mucociliary function. Dysplasia (A) involves disordered, premalignant cellular
growth with nuclear atypia—not a uniform cell type change. Anaplasia (B) indicates loss
, of differentiation in malignancy. Hyperplasia (D) increases cell number without
changing cell type. While metaplasia is adaptive, it increases cancer risk (squamous cell
carcinoma) and represents a "lesser of two evils" adaptation.
Q4: Cervical Pap smear from a 28-year-old woman shows disordered maturation with
nuclear hyperchromasia, increased nuclear-to-cytoplasmic ratio, and abnormal mitotic
figures confined to the lower third of the epithelium. Which term best describes these
findings?
A. Metaplasia
B. Hyperplasia
C. Carcinoma in situ
D. Cervical intraepithelial neoplasia (CIN I) [CORRECT]
Correct Answer: D
Rationale: The findings describe low-grade cervical intraepithelial neoplasia (CIN I),
characterized by dysplastic changes limited to the basal third of the epithelium with
nuclear abnormalities and disordered maturation. Metaplasia (A) shows orderly
transformation without nuclear atypia. Hyperplasia (B) demonstrates increased cell
proliferation without cytologic atypia. Carcinoma in situ (C) would show full-thickness
dysplasia with loss of maturation. CIN represents a premalignant dysplastic
Questions and Correct Answers with Rationales | Advanced
Pathophysiology Objective Assessment | New | Pass
Guaranteed - A+ Graded
SECTION 1: CELLULAR FUNCTION, ADAPTATION & INJURY (25 Questions)
Q1: A 68-year-old male with a history of benign prostatic hyperplasia presents with
urinary retention leading to bilateral hydronephrosis. Renal biopsy reveals enlarged
tubular epithelial cells with large vacuoles displacing the nucleus to the periphery.
Which cellular adaptation is demonstrated?
A. Hypertrophy
B. Hyperplasia
C. Hydropic change (cellular swelling)
D. Fatty change (steatosis) [CORRECT]
Correct Answer: D
Rationale: The histological description of enlarged cells with clear vacuoles displacing
the nucleus peripherally is characteristic of fatty change (steatosis), where triglycerides
,accumulate in parenchymal cells. In this case, the hydronephrosis causes renal tubular
epithelial injury, impairing fatty acid metabolism and leading to lipid accumulation.
Hypertrophy (A) involves increased cell size without vacuole formation. Hyperplasia (B)
involves increased cell number, not individual cell enlargement with vacuoles. Hydropic
change (C) produces clear vacuoles but represents water accumulation (cloudy
swelling), not lipid displacement of the nucleus. The "signet ring" appearance is
pathognomonic for steatosis.
Q2: A 45-year-old woman undergoes bilateral mastectomy with immediate
reconstruction. Six months postoperatively, histology of the rectus abdominis muscle
used for flap reconstruction shows increased fiber size with increased number of
myofibrils per cell. This represents which adaptive response?
A. Physiologic atrophy
B. Compensatory hypertrophy
C. Denervation atrophy
D. Metaplasia [CORRECT]
Correct Answer: B
Rationale: The rectus abdominis muscle demonstrates compensatory hypertrophy—an
increase in cell size (not number) resulting from increased workload during the healing
and functional adaptation phase. The increased myofibril count confirms true
,hypertrophy rather than edema. Physiologic atrophy (A) occurs with aging or disuse and
would show decreased fiber size. Denervation atrophy (C) produces small, angular
fibers with fiber-type grouping. Metaplasia (D) involves transformation to a different cell
type, not enlargement of the same cell type. This represents an adaptive response to
increased functional demand on the transferred muscle.
Q3: A chronic smoker's bronchial epithelium demonstrates transformation from
pseudostratified ciliated columnar epithelium to stratified squamous epithelium. This
change increases resistance to irritation but compromises mucociliary clearance.
Which cellular adaptation is described?
A. Dysplasia
B. Anaplasia
C. Metaplasia [CORRECT]
D. Hyperplasia
Correct Answer: C
Rationale: Metaplasia is the reversible replacement of one differentiated cell type by
another, typically occurring in response to chronic irritation. The transformation to
squamous epithelium provides better protection against chemical injury but sacrifices
normal mucociliary function. Dysplasia (A) involves disordered, premalignant cellular
growth with nuclear atypia—not a uniform cell type change. Anaplasia (B) indicates loss
, of differentiation in malignancy. Hyperplasia (D) increases cell number without
changing cell type. While metaplasia is adaptive, it increases cancer risk (squamous cell
carcinoma) and represents a "lesser of two evils" adaptation.
Q4: Cervical Pap smear from a 28-year-old woman shows disordered maturation with
nuclear hyperchromasia, increased nuclear-to-cytoplasmic ratio, and abnormal mitotic
figures confined to the lower third of the epithelium. Which term best describes these
findings?
A. Metaplasia
B. Hyperplasia
C. Carcinoma in situ
D. Cervical intraepithelial neoplasia (CIN I) [CORRECT]
Correct Answer: D
Rationale: The findings describe low-grade cervical intraepithelial neoplasia (CIN I),
characterized by dysplastic changes limited to the basal third of the epithelium with
nuclear abnormalities and disordered maturation. Metaplasia (A) shows orderly
transformation without nuclear atypia. Hyperplasia (B) demonstrates increased cell
proliferation without cytologic atypia. Carcinoma in situ (C) would show full-thickness
dysplasia with loss of maturation. CIN represents a premalignant dysplastic
