N212 Pathophysiology Exam 1 Actual Exam 2026/2027 |
Comprehensive Study Guide with Detailed Rationales |
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SECTION 1: Cellular Adaptation, Injury & Death
Q1: A 58-year-old male with a history of atherosclerosis develops crushing chest pain.
Cardiac catheterization reveals occlusion of the left anterior descending artery. Biopsy
of the affected myocardium 24 hours later would most likely demonstrate which
pathologic finding?
A. Liquefactive necrosis with neutrophilic infiltrate
B. Coagulative necrosis with preserved tissue architecture [CORRECT]
C. Caseous necrosis with granulomatous inflammation
D. Fat necrosis with chalky white deposits
Correct Answer: B
Rationale: Coagulative necrosis is the characteristic pattern of ischemic injury in solid
organs such as the heart, kidney, and spleen (excluding the brain). Protein denaturation
preserves the cellular outlines and tissue architecture for several days, allowing the
outline of individual cells to remain visible microscopically. Liquefactive necrosis occurs
in the brain and bacterial abscesses due to enzymatic digestion. Caseous necrosis is
associated with tuberculosis, and fat necrosis occurs in acute pancreatitis or breast
trauma.
Q2: A 70-year-old woman with right-sided heart failure presents with an enlarged liver.
Histology reveals enlarged hepatocytes with increased cytoplasmic mass. This cellular
adaptation is best described as:
A. Atrophy
B. Hyperplasia
C. Hypertrophy [CORRECT]
D. Metaplasia
,Correct Answer: C
Rationale: Hypertrophy is an increase in cell size resulting in enlarged organ size without
an increase in cell number. In right-sided heart failure, congestion and increased
workload lead to hepatocyte hypertrophy. Atrophy is a decrease in cell size. Hyperplasia
is an increase in cell number. Metaplasia is the replacement of one differentiated cell
type with another.
Q3: A 45-year-old female with chronic gastroesophageal reflux disease undergoes
endoscopy. Biopsy reveals columnar epithelium with goblet cells replacing the normal
squamous epithelium of the distal esophagus. This change represents:
A. Dysplasia
B. Hyperplasia
C. Metaplasia [CORRECT]
D. Anaplasia
Correct Answer: C
Rationale: Metaplasia is the reversible replacement of one differentiated cell type with
another, often in response to chronic irritation or inflammation. Barrett's esophagus,
where columnar epithelium replaces squamous epithelium due to GERD, is a classic
example. Dysplasia refers to disordered growth with abnormal size, shape, and
organization and is considered pre-neoplastic. Hyperplasia is increased cell number.
Anaplasia is a loss of differentiation associated with malignancy.
Q4: A 35-year-old woman undergoes breast biopsy for a suspicious mammographic
finding. Histology shows proliferating ductal epithelial cells with nuclear pleomorphism,
hyperchromasia, and loss of normal polarity, but the basement membrane remains
intact. This finding is best classified as:
A. Hyperplasia
B. Carcinoma in situ
C. Dysplasia [CORRECT]
D. Metaplasia
Correct Answer: C
, Rationale: Dysplasia is characterized by abnormal changes in cell size, shape, and
organization with nuclear pleomorphism and hyperchromasia. It represents disordered
growth and is not a true adaptation; it may be a precursor to malignancy. In this
scenario, the basement membrane is intact, but the cellular atypia and loss of polarity
define dysplasia rather than simple hyperplasia or metaplasia.
Q5: A 62-year-old man presents with progressive dyspnea. CT pulmonary angiography
reveals a large pulmonary embolus occluding the main pulmonary artery. The most
common mechanism of cellular injury in the affected lung tissue is:
A. Direct bacterial toxins
B. Hypoxia due to ischemia [CORRECT]
C. Chemical toxicity from medications
D. Radiation-induced DNA damage
Correct Answer: B
Rationale: Hypoxia is the most common cause of cellular injury and refers to inadequate
oxygenation of tissues. Ischemia, which is diminished blood flow, is the most common
cause of hypoxia. A pulmonary embolus causes ischemic hypoxia by obstructing
arterial blood flow. While bacterial toxins, chemicals, and radiation cause cellular injury,
hypoxia from ischemia is the predominant mechanism in pulmonary embolism.
Q6: During reperfusion of an ischemic limb, which of the following mechanisms
contributes most significantly to additional cellular damage?
A. Restoration of ATP synthesis
B. Generation of reactive oxygen species [CORRECT]
C. Influx of potassium ions
D. Activation of anaerobic glycolysis
Correct Answer: B
Rationale: Ischemia-reperfusion injury occurs when oxygen is reintroduced to previously
ischemic tissue, leading to the production of reactive oxygen species (ROS) such as
superoxide and hydroxyl radicals. These ROS cause oxidative damage to lipids, proteins,
and DNA. While restoration of ATP is beneficial, the burst of ROS during reperfusion
Comprehensive Study Guide with Detailed Rationales |
Pass Guaranteed – A+ Graded
SECTION 1: Cellular Adaptation, Injury & Death
Q1: A 58-year-old male with a history of atherosclerosis develops crushing chest pain.
Cardiac catheterization reveals occlusion of the left anterior descending artery. Biopsy
of the affected myocardium 24 hours later would most likely demonstrate which
pathologic finding?
A. Liquefactive necrosis with neutrophilic infiltrate
B. Coagulative necrosis with preserved tissue architecture [CORRECT]
C. Caseous necrosis with granulomatous inflammation
D. Fat necrosis with chalky white deposits
Correct Answer: B
Rationale: Coagulative necrosis is the characteristic pattern of ischemic injury in solid
organs such as the heart, kidney, and spleen (excluding the brain). Protein denaturation
preserves the cellular outlines and tissue architecture for several days, allowing the
outline of individual cells to remain visible microscopically. Liquefactive necrosis occurs
in the brain and bacterial abscesses due to enzymatic digestion. Caseous necrosis is
associated with tuberculosis, and fat necrosis occurs in acute pancreatitis or breast
trauma.
Q2: A 70-year-old woman with right-sided heart failure presents with an enlarged liver.
Histology reveals enlarged hepatocytes with increased cytoplasmic mass. This cellular
adaptation is best described as:
A. Atrophy
B. Hyperplasia
C. Hypertrophy [CORRECT]
D. Metaplasia
,Correct Answer: C
Rationale: Hypertrophy is an increase in cell size resulting in enlarged organ size without
an increase in cell number. In right-sided heart failure, congestion and increased
workload lead to hepatocyte hypertrophy. Atrophy is a decrease in cell size. Hyperplasia
is an increase in cell number. Metaplasia is the replacement of one differentiated cell
type with another.
Q3: A 45-year-old female with chronic gastroesophageal reflux disease undergoes
endoscopy. Biopsy reveals columnar epithelium with goblet cells replacing the normal
squamous epithelium of the distal esophagus. This change represents:
A. Dysplasia
B. Hyperplasia
C. Metaplasia [CORRECT]
D. Anaplasia
Correct Answer: C
Rationale: Metaplasia is the reversible replacement of one differentiated cell type with
another, often in response to chronic irritation or inflammation. Barrett's esophagus,
where columnar epithelium replaces squamous epithelium due to GERD, is a classic
example. Dysplasia refers to disordered growth with abnormal size, shape, and
organization and is considered pre-neoplastic. Hyperplasia is increased cell number.
Anaplasia is a loss of differentiation associated with malignancy.
Q4: A 35-year-old woman undergoes breast biopsy for a suspicious mammographic
finding. Histology shows proliferating ductal epithelial cells with nuclear pleomorphism,
hyperchromasia, and loss of normal polarity, but the basement membrane remains
intact. This finding is best classified as:
A. Hyperplasia
B. Carcinoma in situ
C. Dysplasia [CORRECT]
D. Metaplasia
Correct Answer: C
, Rationale: Dysplasia is characterized by abnormal changes in cell size, shape, and
organization with nuclear pleomorphism and hyperchromasia. It represents disordered
growth and is not a true adaptation; it may be a precursor to malignancy. In this
scenario, the basement membrane is intact, but the cellular atypia and loss of polarity
define dysplasia rather than simple hyperplasia or metaplasia.
Q5: A 62-year-old man presents with progressive dyspnea. CT pulmonary angiography
reveals a large pulmonary embolus occluding the main pulmonary artery. The most
common mechanism of cellular injury in the affected lung tissue is:
A. Direct bacterial toxins
B. Hypoxia due to ischemia [CORRECT]
C. Chemical toxicity from medications
D. Radiation-induced DNA damage
Correct Answer: B
Rationale: Hypoxia is the most common cause of cellular injury and refers to inadequate
oxygenation of tissues. Ischemia, which is diminished blood flow, is the most common
cause of hypoxia. A pulmonary embolus causes ischemic hypoxia by obstructing
arterial blood flow. While bacterial toxins, chemicals, and radiation cause cellular injury,
hypoxia from ischemia is the predominant mechanism in pulmonary embolism.
Q6: During reperfusion of an ischemic limb, which of the following mechanisms
contributes most significantly to additional cellular damage?
A. Restoration of ATP synthesis
B. Generation of reactive oxygen species [CORRECT]
C. Influx of potassium ions
D. Activation of anaerobic glycolysis
Correct Answer: B
Rationale: Ischemia-reperfusion injury occurs when oxygen is reintroduced to previously
ischemic tissue, leading to the production of reactive oxygen species (ROS) such as
superoxide and hydroxyl radicals. These ROS cause oxidative damage to lipids, proteins,
and DNA. While restoration of ATP is beneficial, the burst of ROS during reperfusion
