Comprehensive WGU D115 Advanced
Pathophysiology OA Exam
Preparation: Practice Questions with
Evidence-Based Rationales
(2025/2026 Edition)
UNIT 1: CELLULAR PATHOPHYSIOLOGY & ADAPTATION
Q1: A patient with chronic hypertension develops left ventricular
hypertrophy. Which cellular adaptation best describes this change?
A) Hyperplasia
B) Atrophy
C) Hypertrophy
D) Metaplasia
Answer: C) Hypertrophy
Rationale: Hypertrophy is an increase in cell size in response to increased
workload. Cardiac muscle cells enlarge to meet the increased demand from
chronic hypertension. Because cardiac myocytes cannot significantly divide,
the heart compensates by increasing cell size rather than cell number .
,Q2: A patient with COPD develops squamous metaplasia in the
bronchial epithelium. Which statement best describes this cellular
change?
A) An increase in cell size
B) A reversible replacement of one differentiated cell type with another
C) An increase in the number of cells
D) A decrease in cell size
Answer: B) A reversible replacement of one differentiated cell type
with another
Rationale: Metaplasia is a reversible change in which one differentiated cell
type is replaced by another cell type. In COPD, chronic irritation from
smoking causes the normal ciliated columnar epithelium of the bronchi to
be replaced by stratified squamous epithelium .
Q3: A patient with long-standing GERD develops Barrett's esophagus.
This represents which cellular adaptation?
A) Hypertrophy
B) Hyperplasia
C) Metaplasia
D) Dysplasia
Answer: C) Metaplasia
Rationale: Barrett's esophagus is a metaplastic change in which the normal
squamous epithelium of the esophagus is replaced by columnar epithelium
similar to that of the stomach or intestines in response to chronic acid
exposure .
,Q4: Which feature distinguishes apoptosis from necrosis?
A) Apoptosis triggers significant inflammation
B) Apoptosis is an uncontrolled process
C) Apoptosis is energy-dependent and programmed
D) Necrosis is a programmed process
Answer: C) Apoptosis is energy-dependent and programmed
Rationale: Apoptosis is programmed cell death that is energy-dependent
and does not trigger inflammation. Necrosis is uncontrolled, causes cell
swelling, and triggers an inflammatory response .
Q5: A patient presents with signs of inflammation including redness,
heat, swelling, and pain. Which chemical mediator is primarily
responsible for these findings?
A) Cortisol
B) Histamine
C) Insulin
D) Epinephrine
Answer: B) Histamine
Rationale: Histamine is a key chemical mediator released during
inflammation that causes vasodilation (redness, heat) and increased
vascular permeability (swelling). It is released from mast cells during the
inflammatory response .
, Q6: Oxidative stress from free radicals can damage which cellular
components?
A) Only cell membranes
B) DNA, lipids, and proteins
C) Only mitochondria
D) Only cell nuclei
Answer: B) DNA, lipids, and proteins
Rationale: Free radicals damage multiple cellular components including
DNA, lipids (cell membranes), and proteins. Antioxidants like vitamin C,
vitamin E, and glutathione help neutralize free radicals .
Q7: A patient experiences cellular injury from ischemia. Which of the
following is the primary cause?
A) Bacterial infection
B) Physical trauma
C) Lack of oxygen delivery
D) Chemical exposure
Answer: C) Lack of oxygen delivery
Rationale: Ischemia causes cellular injury due to reduced blood flow and
subsequent oxygen deprivation (hypoxia). This leads to impaired cellular
metabolism and ATP production .
Pathophysiology OA Exam
Preparation: Practice Questions with
Evidence-Based Rationales
(2025/2026 Edition)
UNIT 1: CELLULAR PATHOPHYSIOLOGY & ADAPTATION
Q1: A patient with chronic hypertension develops left ventricular
hypertrophy. Which cellular adaptation best describes this change?
A) Hyperplasia
B) Atrophy
C) Hypertrophy
D) Metaplasia
Answer: C) Hypertrophy
Rationale: Hypertrophy is an increase in cell size in response to increased
workload. Cardiac muscle cells enlarge to meet the increased demand from
chronic hypertension. Because cardiac myocytes cannot significantly divide,
the heart compensates by increasing cell size rather than cell number .
,Q2: A patient with COPD develops squamous metaplasia in the
bronchial epithelium. Which statement best describes this cellular
change?
A) An increase in cell size
B) A reversible replacement of one differentiated cell type with another
C) An increase in the number of cells
D) A decrease in cell size
Answer: B) A reversible replacement of one differentiated cell type
with another
Rationale: Metaplasia is a reversible change in which one differentiated cell
type is replaced by another cell type. In COPD, chronic irritation from
smoking causes the normal ciliated columnar epithelium of the bronchi to
be replaced by stratified squamous epithelium .
Q3: A patient with long-standing GERD develops Barrett's esophagus.
This represents which cellular adaptation?
A) Hypertrophy
B) Hyperplasia
C) Metaplasia
D) Dysplasia
Answer: C) Metaplasia
Rationale: Barrett's esophagus is a metaplastic change in which the normal
squamous epithelium of the esophagus is replaced by columnar epithelium
similar to that of the stomach or intestines in response to chronic acid
exposure .
,Q4: Which feature distinguishes apoptosis from necrosis?
A) Apoptosis triggers significant inflammation
B) Apoptosis is an uncontrolled process
C) Apoptosis is energy-dependent and programmed
D) Necrosis is a programmed process
Answer: C) Apoptosis is energy-dependent and programmed
Rationale: Apoptosis is programmed cell death that is energy-dependent
and does not trigger inflammation. Necrosis is uncontrolled, causes cell
swelling, and triggers an inflammatory response .
Q5: A patient presents with signs of inflammation including redness,
heat, swelling, and pain. Which chemical mediator is primarily
responsible for these findings?
A) Cortisol
B) Histamine
C) Insulin
D) Epinephrine
Answer: B) Histamine
Rationale: Histamine is a key chemical mediator released during
inflammation that causes vasodilation (redness, heat) and increased
vascular permeability (swelling). It is released from mast cells during the
inflammatory response .
, Q6: Oxidative stress from free radicals can damage which cellular
components?
A) Only cell membranes
B) DNA, lipids, and proteins
C) Only mitochondria
D) Only cell nuclei
Answer: B) DNA, lipids, and proteins
Rationale: Free radicals damage multiple cellular components including
DNA, lipids (cell membranes), and proteins. Antioxidants like vitamin C,
vitamin E, and glutathione help neutralize free radicals .
Q7: A patient experiences cellular injury from ischemia. Which of the
following is the primary cause?
A) Bacterial infection
B) Physical trauma
C) Lack of oxygen delivery
D) Chemical exposure
Answer: C) Lack of oxygen delivery
Rationale: Ischemia causes cellular injury due to reduced blood flow and
subsequent oxygen deprivation (hypoxia). This leads to impaired cellular
metabolism and ATP production .
