,WGU D236 OA Exam | Pathophysiology (2026) Q&A |
WGU
1. A patient with prolonged tissue ischemia demonstrates severe cellular swelling,
membrane rupture, and release of intracellular enzymes into the circulation. Which
mechanism most directly explains the irreversible nature of this injury?
A) Increased glycolysis with preserved mitochondrial function
B) Persistent depletion of ATP leading to failure of membrane integrity
C) Enhanced autophagy preventing lysosomal rupture
D) Activation of adaptive hypertrophy
Correct Answer: Persistent depletion of ATP leading to failure of membrane integrity
Rationale: Irreversible cell injury occurs when ATP depletion becomes severe enough
to disrupt membrane integrity, allowing leakage of intracellular enzymes and
ultimately resulting in necrosis. Increased glycolysis is an early compensatory
response but does not prevent irreversible injury. Autophagy is generally protective
rather than destructive, and hypertrophy is an adaptive process rather than a
mechanism of irreversible injury.
2. Which cellular adaptation is most likely to occur in cardiac muscle subjected to
chronic hypertension?
A) Atrophy
B) Hyperplasia
C) Dysplasia
D) Hypertrophy
Correct Answer: Hypertrophy
,Rationale: Hypertrophy, an increase in cell size, occurs in cardiac muscle to
compensate for increased workload from chronic hypertension. Atrophy reduces cell
size, dysplasia is abnormal growth, and metaplasia changes cell type. Hypertrophy
allows the heart to generate greater contractile force against the elevated afterload.
3. What is the hallmark feature of apoptosis compared to necrosis?
A) Inflammation
B) Cell membrane rupture
C) DNA fragmentation
D) Tissue liquefaction
Correct Answer: DNA fragmentation
Rationale: Apoptosis is programmed cell death with organized DNA fragmentation,
preserving membrane integrity and avoiding inflammation. Necrosis is unregulated
cell death characterized by cell swelling, membrane rupture, and a vigorous
inflammatory response.
4. During reperfusion injury, what is the primary source of free radical production?
A) Lysosomal rupture
B) Endoplasmic reticulum stress
C) Mitochondrial dysfunction
D) Nuclear fragmentation
Correct Answer: Mitochondrial dysfunction
, Rationale: During reperfusion, mitochondria generate reactive oxygen species (ROS)
due to restored oxygen reacting with accumulated electrons, causing oxidative stress.
Other options contribute to injury but are not the primary source of ROS during
reperfusion.
5. Which type of necrosis is most commonly associated with bacterial infections like
tuberculosis?
A) Coagulative necrosis
B) Liquefactive necrosis
C) Caseous necrosis
D) Fat necrosis
Correct Answer: Caseous necrosis
Rationale: Caseous necrosis, characterized by a cheese-like appearance, is typical in
granulomatous infections like tuberculosis due to macrophage activity. Coagulative
necrosis is seen in ischemic tissues, liquefactive in brain or abscesses, and fat necrosis
in pancreatic or breast tissue injury.
6. A patient with chronic gastroesophageal reflux disease (GERD) develops
replacement of squamous epithelial cells of the lower esophagus with columnar
epithelial cells. This process is best described as:
A) Dysplasia
B) Metaplasia
C) Anaplasia
D) Neoplasia
Correct Answer: Metaplasia
WGU
1. A patient with prolonged tissue ischemia demonstrates severe cellular swelling,
membrane rupture, and release of intracellular enzymes into the circulation. Which
mechanism most directly explains the irreversible nature of this injury?
A) Increased glycolysis with preserved mitochondrial function
B) Persistent depletion of ATP leading to failure of membrane integrity
C) Enhanced autophagy preventing lysosomal rupture
D) Activation of adaptive hypertrophy
Correct Answer: Persistent depletion of ATP leading to failure of membrane integrity
Rationale: Irreversible cell injury occurs when ATP depletion becomes severe enough
to disrupt membrane integrity, allowing leakage of intracellular enzymes and
ultimately resulting in necrosis. Increased glycolysis is an early compensatory
response but does not prevent irreversible injury. Autophagy is generally protective
rather than destructive, and hypertrophy is an adaptive process rather than a
mechanism of irreversible injury.
2. Which cellular adaptation is most likely to occur in cardiac muscle subjected to
chronic hypertension?
A) Atrophy
B) Hyperplasia
C) Dysplasia
D) Hypertrophy
Correct Answer: Hypertrophy
,Rationale: Hypertrophy, an increase in cell size, occurs in cardiac muscle to
compensate for increased workload from chronic hypertension. Atrophy reduces cell
size, dysplasia is abnormal growth, and metaplasia changes cell type. Hypertrophy
allows the heart to generate greater contractile force against the elevated afterload.
3. What is the hallmark feature of apoptosis compared to necrosis?
A) Inflammation
B) Cell membrane rupture
C) DNA fragmentation
D) Tissue liquefaction
Correct Answer: DNA fragmentation
Rationale: Apoptosis is programmed cell death with organized DNA fragmentation,
preserving membrane integrity and avoiding inflammation. Necrosis is unregulated
cell death characterized by cell swelling, membrane rupture, and a vigorous
inflammatory response.
4. During reperfusion injury, what is the primary source of free radical production?
A) Lysosomal rupture
B) Endoplasmic reticulum stress
C) Mitochondrial dysfunction
D) Nuclear fragmentation
Correct Answer: Mitochondrial dysfunction
, Rationale: During reperfusion, mitochondria generate reactive oxygen species (ROS)
due to restored oxygen reacting with accumulated electrons, causing oxidative stress.
Other options contribute to injury but are not the primary source of ROS during
reperfusion.
5. Which type of necrosis is most commonly associated with bacterial infections like
tuberculosis?
A) Coagulative necrosis
B) Liquefactive necrosis
C) Caseous necrosis
D) Fat necrosis
Correct Answer: Caseous necrosis
Rationale: Caseous necrosis, characterized by a cheese-like appearance, is typical in
granulomatous infections like tuberculosis due to macrophage activity. Coagulative
necrosis is seen in ischemic tissues, liquefactive in brain or abscesses, and fat necrosis
in pancreatic or breast tissue injury.
6. A patient with chronic gastroesophageal reflux disease (GERD) develops
replacement of squamous epithelial cells of the lower esophagus with columnar
epithelial cells. This process is best described as:
A) Dysplasia
B) Metaplasia
C) Anaplasia
D) Neoplasia
Correct Answer: Metaplasia
