NR 507 ADVANCED PATHOPHYSIOLOGY FINAL EXAM TEST
BANK 2026/2027 | Chamberlain University | McCance &
Huether Standards | Verified Q&A | Pass Guaranteed - A+
Graded
SECTION 1: CELLULAR ADAPTATION, INJURY & NEOPLASIA
(Questions 1–20)
QUESTION 1
A 68-year-old male with chronic obstructive pulmonary disease (COPD) presents with
progressive dyspnea. Chest CT reveals enlarged, hyperinflated lungs with flattened
diaphragms. Histologic examination of the diaphragm shows increased cross-sectional
area of individual muscle fibers. This cellular adaptation is best described as:
A) Atrophy
B) Hypertrophy
C) Hyperplasia
D) Metaplasia
CORRECT ANSWER: B) Hypertrophy
RATIONALE: Hypertrophy is an increase in cell size resulting in enlarged tissue mass
without an increase in cell number. In COPD with chronic increased work of breathing,
the diaphragm undergoes compensatory hypertrophy of type I oxidative muscle fibers
to meet increased metabolic demands. Why A is wrong: Atrophy is decreased cell size;
the diaphragm in COPD actually hypertrophies or undergoes fiber type transformation,
not atrophy. Why C is wrong: Hyperplasia is an increase in cell number; skeletal muscle
fibers are terminally differentiated post-mitotic cells and cannot undergo hyperplasia.
Why D is wrong: Metaplasia is the replacement of one differentiated cell type with
another (e.g., respiratory epithelium to squamous epithelium in smokers); this does not
describe muscle fiber enlargement. Clinical Pearl: The diaphragm in COPD undergoes
fiber type shifts from type II to type I and oxidative enzyme changes—understanding
,cellular adaptation mechanisms is critical for predicting functional outcomes in chronic
disease.
QUESTION 2
A 45-year-old woman with uterine fibroids undergoes hysterectomy. Pathology reveals
numerous well-circumscribed, whorled nodules within the myometrium composed of
increased numbers of smooth muscle cells. This represents which cellular adaptation?
A) Hypertrophy
B) Hyperplasia
C) Dysplasia
D) Anaplasia
CORRECT ANSWER: B) Hyperplasia
RATIONALE: Uterine leiomyomas (fibroids) are benign smooth muscle tumors arising
from estrogen-stimulated hyperplasia of myometrial cells. The increased cell number
(hyperplasia) in response to hormonal stimulation is the primary mechanism. Why A is
wrong: While some hypertrophy may coexist, the dominant process in fibroid
formation is increased cell proliferation (hyperplasia), not individual cell enlargement.
Why C is wrong: Dysplasia refers to disordered, pre-neoplastic cellular maturation
with nuclear atypia; fibroids are benign without dysplastic features. Why D is wrong:
Anaplasia is loss of cellular differentiation characteristic of malignant neoplasms;
fibroids are benign. Clinical Pearl: Estrogen and progesterone receptors on leiomyoma
cells drive proliferation—this hormonal responsiveness explains why fibroids regress
after menopause and why GnRH agonists (leuprolide) induce shrinkage via estrogen
suppression.
QUESTION 3
A 58-year-old male with a 40 pack-year smoking history has bronchoscopy with biopsy.
Histology shows replacement of normal pseudostratified ciliated columnar epithelium
with stratified squamous epithelium in the bronchial mucosa. This finding represents:
,A) Hypertrophy
B) Hyperplasia
C) Metaplasia
D) Dysplasia
CORRECT ANSWER: C) Metaplasia
RATIONALE: Metaplasia is the reversible replacement of one differentiated adult cell
type with another, typically in response to chronic irritation or stress. Smoking-induced
chronic irritation causes respiratory epithelium to transform to squamous epithelium
(squamous metaplasia), which is better suited to withstand chemical injury but loses
mucociliary clearance function. Why A/B are wrong: These involve changes in cell size
or number, not cell type transformation. Why D is wrong: Dysplasia involves
disordered maturation with nuclear atypia and is considered pre-neoplastic; while
metaplasia can progress to dysplasia, this histologic description shows orderly
replacement without atypia. Clinical Pearl: Squamous metaplasia in the respiratory
tract is a reversible adaptive change but represents a risk factor for squamous cell
carcinoma progression if the irritant (smoking) persists—understanding this
progression (metaplasia → dysplasia → carcinoma in situ → invasive carcinoma) is
essential for cancer prevention strategies.
QUESTION 4
A pathologist examines cervical epithelium and notes disordered maturation with
nuclear hyperchromasia, increased nuclear-to-cytoplasmic ratio, and loss of polarity
extending from the basal layer through the full thickness of the epithelium, but no
invasion through the basement membrane. The most appropriate diagnosis is:
A) Metaplasia
B) Mild dysplasia (CIN I)
C) Severe dysplasia/Carcinoma in situ (CIN III)
D) Invasive squamous cell carcinoma
CORRECT ANSWER: C) Severe dysplasia/Carcinoma in situ (CIN III)
RATIONALE: The description of full-thickness epithelial involvement with severe
cytologic atypia but intact basement membrane defines carcinoma in situ (CIN
, III/HSIL). This represents the most severe pre-invasive lesion before progression to
invasive cancer. Why A is wrong: Metaplasia is reversible cell type change without
nuclear atypia. Why B is wrong: Mild dysplasia (CIN I) involves only the lower third of
the epithelium. Why D is wrong: Invasive carcinoma requires breach of the basement
membrane with stromal invasion, which is absent here. Clinical Pearl: CIN III is driven
by high-risk HPV E6/E7 oncoproteins inactivating p53 and pRb tumor suppressor
proteins. The progression from CIN I to CIN III reflects accumulation of genetic
mutations—understanding this natural history guides screening intervals and
treatment decisions (LEEP, cone biopsy).
QUESTION 5
A 72-year-old male presents with crushing chest pain and is diagnosed with acute
anterior wall STEMI. Despite successful PCI, reperfusion injury occurs. Which
mechanism BEST explains the myocardial damage observed during reperfusion?
A) ATP depletion with failure of Na⁺/K⁺-ATPase pumps
B) Opening of mitochondrial permeability transition pores (mPTP) with ROS generation
and calcium overload
C) Activation of caspase-8 via Fas/FasL death receptor pathway
D) Lysosomal enzyme release causing autodigestion
CORRECT ANSWER: B) Opening of mitochondrial permeability transition pores
(mPTP) with ROS generation and calcium overload
RATIONALE: Ischemia-reperfusion injury is characterized by mPTP opening in
response to calcium overload and oxidative stress during reperfusion. This causes
mitochondrial dysfunction, release of cytochrome c, and generation of reactive oxygen
species (superoxide, hydroxyl radical, peroxynitrite), perpetuating a cycle of cellular
damage. Why A is wrong: ATP depletion occurs during ischemia, not specifically during
reperfusion; while it contributes to injury, it is not the defining mechanism of
reperfusion-specific damage. Why C is wrong: Caspase-8 activation via death receptors
characterizes extrinsic apoptosis, not the primary mechanism of ischemia-reperfusion
injury. Why D is wrong: Lysosomal enzyme release is characteristic of autophagic cell
death or certain necrotic processes, not the central mechanism of reperfusion injury.
BANK 2026/2027 | Chamberlain University | McCance &
Huether Standards | Verified Q&A | Pass Guaranteed - A+
Graded
SECTION 1: CELLULAR ADAPTATION, INJURY & NEOPLASIA
(Questions 1–20)
QUESTION 1
A 68-year-old male with chronic obstructive pulmonary disease (COPD) presents with
progressive dyspnea. Chest CT reveals enlarged, hyperinflated lungs with flattened
diaphragms. Histologic examination of the diaphragm shows increased cross-sectional
area of individual muscle fibers. This cellular adaptation is best described as:
A) Atrophy
B) Hypertrophy
C) Hyperplasia
D) Metaplasia
CORRECT ANSWER: B) Hypertrophy
RATIONALE: Hypertrophy is an increase in cell size resulting in enlarged tissue mass
without an increase in cell number. In COPD with chronic increased work of breathing,
the diaphragm undergoes compensatory hypertrophy of type I oxidative muscle fibers
to meet increased metabolic demands. Why A is wrong: Atrophy is decreased cell size;
the diaphragm in COPD actually hypertrophies or undergoes fiber type transformation,
not atrophy. Why C is wrong: Hyperplasia is an increase in cell number; skeletal muscle
fibers are terminally differentiated post-mitotic cells and cannot undergo hyperplasia.
Why D is wrong: Metaplasia is the replacement of one differentiated cell type with
another (e.g., respiratory epithelium to squamous epithelium in smokers); this does not
describe muscle fiber enlargement. Clinical Pearl: The diaphragm in COPD undergoes
fiber type shifts from type II to type I and oxidative enzyme changes—understanding
,cellular adaptation mechanisms is critical for predicting functional outcomes in chronic
disease.
QUESTION 2
A 45-year-old woman with uterine fibroids undergoes hysterectomy. Pathology reveals
numerous well-circumscribed, whorled nodules within the myometrium composed of
increased numbers of smooth muscle cells. This represents which cellular adaptation?
A) Hypertrophy
B) Hyperplasia
C) Dysplasia
D) Anaplasia
CORRECT ANSWER: B) Hyperplasia
RATIONALE: Uterine leiomyomas (fibroids) are benign smooth muscle tumors arising
from estrogen-stimulated hyperplasia of myometrial cells. The increased cell number
(hyperplasia) in response to hormonal stimulation is the primary mechanism. Why A is
wrong: While some hypertrophy may coexist, the dominant process in fibroid
formation is increased cell proliferation (hyperplasia), not individual cell enlargement.
Why C is wrong: Dysplasia refers to disordered, pre-neoplastic cellular maturation
with nuclear atypia; fibroids are benign without dysplastic features. Why D is wrong:
Anaplasia is loss of cellular differentiation characteristic of malignant neoplasms;
fibroids are benign. Clinical Pearl: Estrogen and progesterone receptors on leiomyoma
cells drive proliferation—this hormonal responsiveness explains why fibroids regress
after menopause and why GnRH agonists (leuprolide) induce shrinkage via estrogen
suppression.
QUESTION 3
A 58-year-old male with a 40 pack-year smoking history has bronchoscopy with biopsy.
Histology shows replacement of normal pseudostratified ciliated columnar epithelium
with stratified squamous epithelium in the bronchial mucosa. This finding represents:
,A) Hypertrophy
B) Hyperplasia
C) Metaplasia
D) Dysplasia
CORRECT ANSWER: C) Metaplasia
RATIONALE: Metaplasia is the reversible replacement of one differentiated adult cell
type with another, typically in response to chronic irritation or stress. Smoking-induced
chronic irritation causes respiratory epithelium to transform to squamous epithelium
(squamous metaplasia), which is better suited to withstand chemical injury but loses
mucociliary clearance function. Why A/B are wrong: These involve changes in cell size
or number, not cell type transformation. Why D is wrong: Dysplasia involves
disordered maturation with nuclear atypia and is considered pre-neoplastic; while
metaplasia can progress to dysplasia, this histologic description shows orderly
replacement without atypia. Clinical Pearl: Squamous metaplasia in the respiratory
tract is a reversible adaptive change but represents a risk factor for squamous cell
carcinoma progression if the irritant (smoking) persists—understanding this
progression (metaplasia → dysplasia → carcinoma in situ → invasive carcinoma) is
essential for cancer prevention strategies.
QUESTION 4
A pathologist examines cervical epithelium and notes disordered maturation with
nuclear hyperchromasia, increased nuclear-to-cytoplasmic ratio, and loss of polarity
extending from the basal layer through the full thickness of the epithelium, but no
invasion through the basement membrane. The most appropriate diagnosis is:
A) Metaplasia
B) Mild dysplasia (CIN I)
C) Severe dysplasia/Carcinoma in situ (CIN III)
D) Invasive squamous cell carcinoma
CORRECT ANSWER: C) Severe dysplasia/Carcinoma in situ (CIN III)
RATIONALE: The description of full-thickness epithelial involvement with severe
cytologic atypia but intact basement membrane defines carcinoma in situ (CIN
, III/HSIL). This represents the most severe pre-invasive lesion before progression to
invasive cancer. Why A is wrong: Metaplasia is reversible cell type change without
nuclear atypia. Why B is wrong: Mild dysplasia (CIN I) involves only the lower third of
the epithelium. Why D is wrong: Invasive carcinoma requires breach of the basement
membrane with stromal invasion, which is absent here. Clinical Pearl: CIN III is driven
by high-risk HPV E6/E7 oncoproteins inactivating p53 and pRb tumor suppressor
proteins. The progression from CIN I to CIN III reflects accumulation of genetic
mutations—understanding this natural history guides screening intervals and
treatment decisions (LEEP, cone biopsy).
QUESTION 5
A 72-year-old male presents with crushing chest pain and is diagnosed with acute
anterior wall STEMI. Despite successful PCI, reperfusion injury occurs. Which
mechanism BEST explains the myocardial damage observed during reperfusion?
A) ATP depletion with failure of Na⁺/K⁺-ATPase pumps
B) Opening of mitochondrial permeability transition pores (mPTP) with ROS generation
and calcium overload
C) Activation of caspase-8 via Fas/FasL death receptor pathway
D) Lysosomal enzyme release causing autodigestion
CORRECT ANSWER: B) Opening of mitochondrial permeability transition pores
(mPTP) with ROS generation and calcium overload
RATIONALE: Ischemia-reperfusion injury is characterized by mPTP opening in
response to calcium overload and oxidative stress during reperfusion. This causes
mitochondrial dysfunction, release of cytochrome c, and generation of reactive oxygen
species (superoxide, hydroxyl radical, peroxynitrite), perpetuating a cycle of cellular
damage. Why A is wrong: ATP depletion occurs during ischemia, not specifically during
reperfusion; while it contributes to injury, it is not the defining mechanism of
reperfusion-specific damage. Why C is wrong: Caspase-8 activation via death receptors
characterizes extrinsic apoptosis, not the primary mechanism of ischemia-reperfusion
injury. Why D is wrong: Lysosomal enzyme release is characteristic of autophagic cell
death or certain necrotic processes, not the central mechanism of reperfusion injury.
