WGU D115
Advanced Pathophysiology
OA AND PRE-OA REVIEW TEST BANK
Units 2, 3, 4, 5, 6, and 7 | Real Exam Questions and Correct Answers
Western Governors University | 2026-2027
150 Questions | Guaranteed Pass | Graded A+
Objective Assessment and Pre-OA Examination Preparation
,SECTION 1: Cellular Function, Adaptation, and Injury
Cell Structure, Adaptation (Atrophy, Hypertrophy, Hyperplasia, Metaplasia, Dysplasia), Apoptosis, Necrosis, Cellular Injury
Mechanisms, and Neoplasia
Q1: Which of the following best describes the pathophysiologic mechanism of cellular atrophy?
A. A decrease in cell size due to reduced protein synthesis and increased protein degradation
[CORRECT]
B. An increase in cell number in response to hormonal stimulation
C. A reversible change in which one adult cell type is replaced by another adult cell type
D. Abnormal cell growth with disordered maturation and loss of normal architecture
Correct Answer: A
Rationale: Cellular atrophy is characterized by a reduction in cell size resulting from decreased protein synthesis coupled
with increased protein degradation via the ubiquitin-proteasome pathway and autophagy. This represents an adaptive
response to reduced workload, diminished blood supply, inadequate nutrition, or loss of trophic signaling. Unlike
hyperplasia, atrophy does not involve a change in cell number, and unlike metaplasia, there is no change in cell type.
Q2: A 68-year-old man presents with exertional dyspnea and angina. Echocardiography reveals a
calcified aortic valve with a valve area of 0.7 cm² and concentric left ventricular wall thickening.
Which adaptive response best explains the ventricular changes observed?
A. Hyperplasia of ventricular myocytes due to increased end-diastolic volume
B. Hypertrophy of ventricular myocytes in response to chronic pressure overload [CORRECT]
C. Metaplastic conversion of myocardial cells to fibroblasts
D. Atrophy of the ventricular wall secondary to reduced cardiac output
Correct Answer: B
Rationale: Aortic stenosis creates a chronic pressure overload on the left ventricle by increasing afterload. The ventricle
adapts through concentric hypertrophy, in which individual myocardial fibers increase in size (not number) by adding
sarcomeres in parallel, thickening the ventricular wall without chamber dilation. This adaptive mechanism maintains cardiac
output against the elevated resistance but eventually leads to diastolic dysfunction, myocardial ischemia, and heart failure if
the stenosis is not corrected.
Q3: A researcher is studying molecular mechanisms driving cardiac hypertrophy. They find that
mechanical stretch on cardiomyocytes activates phospholipase C, leading to inositol triphosphate (IP3)
and diacylglycerol (DAG) production, which in turn activate protein kinase C and increase
intracellular calcium. These signals ultimately upregulate genes encoding atrial natriuretic peptide
(ANP) and B-type natriuretic peptide (BNP). What is the significance of ANP and BNP upregulation
in this context?
A. They are markers of apoptosis triggered by pressure overload
B. They are reactivated fetal gene programs representing a maladaptive hypertrophic response
[CORRECT]
C. They promote angiogenesis to support the enlarged myocardium
D. They indicate metaplastic transformation of cardiac tissue
Correct Answer: B
Rationale: In cardiac hypertrophy, mechanical stress and neurohormonal signaling reactivate fetal gene programs that were
normally silenced after birth. ANP and BNP are classic fetal genes whose re-expression is a hallmark of pathologic
hypertrophy, distinguishing it from physiologic hypertrophy seen in athletes. This molecular reprogramming initially serves a
compensatory function but becomes maladaptive over time, contributing to ventricular remodeling, fibrosis, and progression
,to heart failure.
Q4: Which statement correctly distinguishes physiologic hyperplasia from pathologic hyperplasia?
A. Physiologic hyperplasia is driven by excessive growth factor signaling, while pathologic hyperplasia results
from normal hormonal stimulation
B. Physiologic hyperplasia serves a functional demand (e.g., lactation), while pathologic hyperplasia
results from abnormal hormonal or growth factor stimulation (e.g., endometrial hyperplasia from
unopposed estrogen) [CORRECT]
C. Physiologic hyperplasia involves hypertrophy of existing cells, while pathologic hyperplasia involves
metaplasia
D. There is no distinguishable difference at the cellular level between physiologic and pathologic hyperplasia
Correct Answer: B
Rationale: Physiologic hyperplasia occurs in response to normal functional demands, such as mammary gland enlargement
during pregnancy and lactation driven by prolactin and estrogen. Pathologic hyperplasia results from excessive hormonal or
growth factor stimulation, such as endometrial hyperplasia from unopposed estrogen without progesterone, or prostatic
hyperplasia from dihydrotestosterone. Both involve increased cell number through mitotic division, but pathologic
hyperplasia carries a higher risk of progressing to dysplasia and neoplasia.
Q5: A 14-year-old girl is evaluated for bilateral breast bud development. Her mother reports that
menarche has not yet occurred but breast development began approximately 6 months ago. Which
hormonal mechanism is primarily responsible for the ductal hyperplasia occurring in the breast tissue
at this stage of development?
A. Progesterone stimulating lobular-alveolar development
B. Estrogen stimulating ductal epithelial cell proliferation and branching [CORRECT]
C. Prolactin stimulating milk production and alveolar differentiation
D. Growth hormone directly acting on breast stromal tissue
Correct Answer: B
Rationale: During puberty, rising estrogen levels from the ovaries stimulate proliferation of the ductal epithelium and
stromal tissue in the breast, resulting in ductal elongation and branching. This is a classic example of hormonal physiologic
hyperplasia. Progesterone, which rises after ovulation begins, is primarily responsible for lobular-alveolar development
during the luteal phase and pregnancy. Prolactin plays its major role in lactogenesis postpartum, not during pubertal
development.
Q6: A 52-year-old postmenopausal woman presents with vaginal bleeding. Endometrial biopsy reveals
crowded glands with varying sizes and shapes, but no stromal invasion. She has been taking
unopposed estrogen replacement therapy for 5 years. Which pathophysiologic process best explains
these findings?
A. Endometrial metaplasia with replacement by squamous epithelium
B. Estrogen-driven endometrial hyperplasia with increased risk of progression to adenocarcinoma
[CORRECT]
C. Progesterone-mediated decidualization of the endometrium
D. Apoptosis of endometrial glands due to hormonal withdrawal
Correct Answer: B
Rationale: Unopposed estrogen continuously stimulates endometrial glandular proliferation without the counterbalancing
differentiating and anti-proliferative effects of progesterone. This leads to endometrial hyperplasia, characterized by an
increased gland-to-stroma ratio, crowded irregular glands, and cytologic atypia in more severe forms. Without progesterone
withdrawal to trigger a normal menstrual shedding, the hyperplastic endometrium accumulates and carries a
, well-documented risk of progressing to endometrial adenocarcinoma, particularly when atypia is present.
Q7: A 55-year-old man with a 10-year history of chronic gastroesophageal reflux disease (GERD)
undergoes upper endoscopy. Biopsy of the distal esophagus reveals columnar epithelium with
intestinal-type goblet cells. Which adaptive cellular response has occurred, and what is its clinical
significance?
A. Squamous metaplasia protecting against gastric acid reflux with low malignant potential
B. Columnar metaplasia (Barrett esophagus) serving as a protective adaptation but carrying increased
risk of adenocarcinoma [CORRECT]
C. Dysplasia of esophageal squamous epithelium requiring immediate surgical resection
D. Hyperplasia of esophageal submucosal glands in response to chronic acid exposure
Correct Answer: B
Rationale: Chronic GERD exposes the esophageal squamous epithelium to gastric acid and bile, causing repeated injury. The
esophageal epithelium adapts through metaplasia, replacing the normal stratified squamous epithelium with columnar
epithelium containing intestinal-type goblet cells, a condition known as Barrett esophagus. While this metaplastic change is
more resistant to acid injury, it is a preneoplastic condition that significantly increases the risk of progression to esophageal
adenocarcinoma through a dysplasia-carcinoma sequence.
Q8: A 60-year-old man with a 40-pack-year smoking history presents with a chronic productive cough.
Bronchial biopsy reveals replacement of the normal ciliated columnar epithelium by stratified
squamous epithelium in the large airways. Which statement best describes this finding?
A. This is a malignant transformation indicating squamous cell carcinoma
B. This is squamous metaplasia, a reversible adaptive response to chronic irritation that may progress
to dysplasia with continued exposure [CORRECT]
C. This is hyperplasia of existing ciliated cells in response to toxins
D. This finding is unrelated to smoking and represents normal aging of the respiratory epithelium
Correct Answer: B
Rationale: Chronic exposure to cigarette smoke and other noxious agents damages the ciliated columnar epithelium lining the
bronchi. The respiratory epithelium undergoes squamous metaplasia as an adaptive response, replacing the specialized
columnar cells with more resilient stratified squamous epithelium. While this provides better protection against irritants, the
metaplastic epithelium loses mucociliary clearance function, increasing susceptibility to infection, and with continued
carcinogen exposure, may progress through dysplasia to squamous cell carcinoma.
Q9: What is the fundamental cellular mechanism underlying metaplasia?
A. Irreversible genetic mutation altering cell phenotype permanently
B. Reprogramming of stem cells to differentiate along a different lineage in response to environmental
signals [CORRECT]
C. Uncontrolled mitotic division leading to increased cell numbers
D. Programmed cell death with replacement by fibrous connective tissue
Correct Answer: B
Rationale: Metaplasia involves the reprogramming of pluripotent stem cells or undifferentiated mesenchymal cells to
differentiate along a new lineage in response to chronic stress or altered environmental signals. This process is mediated by
changes in gene expression driven by transcription factors such as CDX2 in Barrett esophagus. Importantly, metaplasia is a
reversible adaptation if the inciting stimulus is removed, but persistent exposure can lead to dysplasia and eventual neoplastic
transformation through accumulated genetic and epigenetic changes.
Q10: A 28-year-old woman undergoes a routine Pap smear, which reveals abnormal cells with
enlarged nuclei, hyperchromasia, and increased nuclear-to-cytoplasmic ratio. HPV testing is positive
Advanced Pathophysiology
OA AND PRE-OA REVIEW TEST BANK
Units 2, 3, 4, 5, 6, and 7 | Real Exam Questions and Correct Answers
Western Governors University | 2026-2027
150 Questions | Guaranteed Pass | Graded A+
Objective Assessment and Pre-OA Examination Preparation
,SECTION 1: Cellular Function, Adaptation, and Injury
Cell Structure, Adaptation (Atrophy, Hypertrophy, Hyperplasia, Metaplasia, Dysplasia), Apoptosis, Necrosis, Cellular Injury
Mechanisms, and Neoplasia
Q1: Which of the following best describes the pathophysiologic mechanism of cellular atrophy?
A. A decrease in cell size due to reduced protein synthesis and increased protein degradation
[CORRECT]
B. An increase in cell number in response to hormonal stimulation
C. A reversible change in which one adult cell type is replaced by another adult cell type
D. Abnormal cell growth with disordered maturation and loss of normal architecture
Correct Answer: A
Rationale: Cellular atrophy is characterized by a reduction in cell size resulting from decreased protein synthesis coupled
with increased protein degradation via the ubiquitin-proteasome pathway and autophagy. This represents an adaptive
response to reduced workload, diminished blood supply, inadequate nutrition, or loss of trophic signaling. Unlike
hyperplasia, atrophy does not involve a change in cell number, and unlike metaplasia, there is no change in cell type.
Q2: A 68-year-old man presents with exertional dyspnea and angina. Echocardiography reveals a
calcified aortic valve with a valve area of 0.7 cm² and concentric left ventricular wall thickening.
Which adaptive response best explains the ventricular changes observed?
A. Hyperplasia of ventricular myocytes due to increased end-diastolic volume
B. Hypertrophy of ventricular myocytes in response to chronic pressure overload [CORRECT]
C. Metaplastic conversion of myocardial cells to fibroblasts
D. Atrophy of the ventricular wall secondary to reduced cardiac output
Correct Answer: B
Rationale: Aortic stenosis creates a chronic pressure overload on the left ventricle by increasing afterload. The ventricle
adapts through concentric hypertrophy, in which individual myocardial fibers increase in size (not number) by adding
sarcomeres in parallel, thickening the ventricular wall without chamber dilation. This adaptive mechanism maintains cardiac
output against the elevated resistance but eventually leads to diastolic dysfunction, myocardial ischemia, and heart failure if
the stenosis is not corrected.
Q3: A researcher is studying molecular mechanisms driving cardiac hypertrophy. They find that
mechanical stretch on cardiomyocytes activates phospholipase C, leading to inositol triphosphate (IP3)
and diacylglycerol (DAG) production, which in turn activate protein kinase C and increase
intracellular calcium. These signals ultimately upregulate genes encoding atrial natriuretic peptide
(ANP) and B-type natriuretic peptide (BNP). What is the significance of ANP and BNP upregulation
in this context?
A. They are markers of apoptosis triggered by pressure overload
B. They are reactivated fetal gene programs representing a maladaptive hypertrophic response
[CORRECT]
C. They promote angiogenesis to support the enlarged myocardium
D. They indicate metaplastic transformation of cardiac tissue
Correct Answer: B
Rationale: In cardiac hypertrophy, mechanical stress and neurohormonal signaling reactivate fetal gene programs that were
normally silenced after birth. ANP and BNP are classic fetal genes whose re-expression is a hallmark of pathologic
hypertrophy, distinguishing it from physiologic hypertrophy seen in athletes. This molecular reprogramming initially serves a
compensatory function but becomes maladaptive over time, contributing to ventricular remodeling, fibrosis, and progression
,to heart failure.
Q4: Which statement correctly distinguishes physiologic hyperplasia from pathologic hyperplasia?
A. Physiologic hyperplasia is driven by excessive growth factor signaling, while pathologic hyperplasia results
from normal hormonal stimulation
B. Physiologic hyperplasia serves a functional demand (e.g., lactation), while pathologic hyperplasia
results from abnormal hormonal or growth factor stimulation (e.g., endometrial hyperplasia from
unopposed estrogen) [CORRECT]
C. Physiologic hyperplasia involves hypertrophy of existing cells, while pathologic hyperplasia involves
metaplasia
D. There is no distinguishable difference at the cellular level between physiologic and pathologic hyperplasia
Correct Answer: B
Rationale: Physiologic hyperplasia occurs in response to normal functional demands, such as mammary gland enlargement
during pregnancy and lactation driven by prolactin and estrogen. Pathologic hyperplasia results from excessive hormonal or
growth factor stimulation, such as endometrial hyperplasia from unopposed estrogen without progesterone, or prostatic
hyperplasia from dihydrotestosterone. Both involve increased cell number through mitotic division, but pathologic
hyperplasia carries a higher risk of progressing to dysplasia and neoplasia.
Q5: A 14-year-old girl is evaluated for bilateral breast bud development. Her mother reports that
menarche has not yet occurred but breast development began approximately 6 months ago. Which
hormonal mechanism is primarily responsible for the ductal hyperplasia occurring in the breast tissue
at this stage of development?
A. Progesterone stimulating lobular-alveolar development
B. Estrogen stimulating ductal epithelial cell proliferation and branching [CORRECT]
C. Prolactin stimulating milk production and alveolar differentiation
D. Growth hormone directly acting on breast stromal tissue
Correct Answer: B
Rationale: During puberty, rising estrogen levels from the ovaries stimulate proliferation of the ductal epithelium and
stromal tissue in the breast, resulting in ductal elongation and branching. This is a classic example of hormonal physiologic
hyperplasia. Progesterone, which rises after ovulation begins, is primarily responsible for lobular-alveolar development
during the luteal phase and pregnancy. Prolactin plays its major role in lactogenesis postpartum, not during pubertal
development.
Q6: A 52-year-old postmenopausal woman presents with vaginal bleeding. Endometrial biopsy reveals
crowded glands with varying sizes and shapes, but no stromal invasion. She has been taking
unopposed estrogen replacement therapy for 5 years. Which pathophysiologic process best explains
these findings?
A. Endometrial metaplasia with replacement by squamous epithelium
B. Estrogen-driven endometrial hyperplasia with increased risk of progression to adenocarcinoma
[CORRECT]
C. Progesterone-mediated decidualization of the endometrium
D. Apoptosis of endometrial glands due to hormonal withdrawal
Correct Answer: B
Rationale: Unopposed estrogen continuously stimulates endometrial glandular proliferation without the counterbalancing
differentiating and anti-proliferative effects of progesterone. This leads to endometrial hyperplasia, characterized by an
increased gland-to-stroma ratio, crowded irregular glands, and cytologic atypia in more severe forms. Without progesterone
withdrawal to trigger a normal menstrual shedding, the hyperplastic endometrium accumulates and carries a
, well-documented risk of progressing to endometrial adenocarcinoma, particularly when atypia is present.
Q7: A 55-year-old man with a 10-year history of chronic gastroesophageal reflux disease (GERD)
undergoes upper endoscopy. Biopsy of the distal esophagus reveals columnar epithelium with
intestinal-type goblet cells. Which adaptive cellular response has occurred, and what is its clinical
significance?
A. Squamous metaplasia protecting against gastric acid reflux with low malignant potential
B. Columnar metaplasia (Barrett esophagus) serving as a protective adaptation but carrying increased
risk of adenocarcinoma [CORRECT]
C. Dysplasia of esophageal squamous epithelium requiring immediate surgical resection
D. Hyperplasia of esophageal submucosal glands in response to chronic acid exposure
Correct Answer: B
Rationale: Chronic GERD exposes the esophageal squamous epithelium to gastric acid and bile, causing repeated injury. The
esophageal epithelium adapts through metaplasia, replacing the normal stratified squamous epithelium with columnar
epithelium containing intestinal-type goblet cells, a condition known as Barrett esophagus. While this metaplastic change is
more resistant to acid injury, it is a preneoplastic condition that significantly increases the risk of progression to esophageal
adenocarcinoma through a dysplasia-carcinoma sequence.
Q8: A 60-year-old man with a 40-pack-year smoking history presents with a chronic productive cough.
Bronchial biopsy reveals replacement of the normal ciliated columnar epithelium by stratified
squamous epithelium in the large airways. Which statement best describes this finding?
A. This is a malignant transformation indicating squamous cell carcinoma
B. This is squamous metaplasia, a reversible adaptive response to chronic irritation that may progress
to dysplasia with continued exposure [CORRECT]
C. This is hyperplasia of existing ciliated cells in response to toxins
D. This finding is unrelated to smoking and represents normal aging of the respiratory epithelium
Correct Answer: B
Rationale: Chronic exposure to cigarette smoke and other noxious agents damages the ciliated columnar epithelium lining the
bronchi. The respiratory epithelium undergoes squamous metaplasia as an adaptive response, replacing the specialized
columnar cells with more resilient stratified squamous epithelium. While this provides better protection against irritants, the
metaplastic epithelium loses mucociliary clearance function, increasing susceptibility to infection, and with continued
carcinogen exposure, may progress through dysplasia to squamous cell carcinoma.
Q9: What is the fundamental cellular mechanism underlying metaplasia?
A. Irreversible genetic mutation altering cell phenotype permanently
B. Reprogramming of stem cells to differentiate along a different lineage in response to environmental
signals [CORRECT]
C. Uncontrolled mitotic division leading to increased cell numbers
D. Programmed cell death with replacement by fibrous connective tissue
Correct Answer: B
Rationale: Metaplasia involves the reprogramming of pluripotent stem cells or undifferentiated mesenchymal cells to
differentiate along a new lineage in response to chronic stress or altered environmental signals. This process is mediated by
changes in gene expression driven by transcription factors such as CDX2 in Barrett esophagus. Importantly, metaplasia is a
reversible adaptation if the inciting stimulus is removed, but persistent exposure can lead to dysplasia and eventual neoplastic
transformation through accumulated genetic and epigenetic changes.
Q10: A 28-year-old woman undergoes a routine Pap smear, which reveals abnormal cells with
enlarged nuclei, hyperchromasia, and increased nuclear-to-cytoplasmic ratio. HPV testing is positive
