MSN 570 ADVANCED PATHOPHYSIOLOGY MIDTERM
STUDY GUIDE 2026/2027 | Graded A Questions &
Answers | AACN Essentials | Pass Guaranteed - A+ Graded
Section 1: Cellular Adaptation, Injury & Neoplasia (Questions 1-
15)
Q1. A 68-year-old male with a 40-pack-year smoking history presents with chronic
cough and hemoptysis. Biopsy of a lung lesion reveals cells with enlarged,
hyperchromatic nuclei, high nuclear-to-cytoplasmic ratio, and disorganized
architecture with loss of polarity. These findings are most consistent with which type
of cellular adaptation or response?
A. Hyperplasia
B. Metaplasia
C. Dysplasia
D. Hypertrophy
C. Dysplasia [CORRECT]
Rationale: Dysplasia is characterized by disordered cell growth with nuclear
pleomorphism, hyperchromatism, increased nuclear-to-cytoplasmic ratio, and loss of
normal tissue architecture. Unlike metaplasia (reversible change of one differentiated
cell type to another) or hyperplasia (increase in cell number), dysplasia represents a
pre-neoplastic change that may progress to carcinoma in situ. Hypertrophy involves
increased cell size without nuclear atypia.
Correct Answer: C
Q2. A 72-year-old female with poorly controlled type 2 diabetes presents with a non-
healing foot ulcer. Histopathology reveals coagulative necrosis with preservation of
,tissue architecture but loss of nuclei. Which mechanism is the PRIMARY driver of this
cell death pattern?
A. Activation of caspases and DNA fragmentation
B. ATP depletion leading to cellular swelling and enzyme denaturation
C. Lysosomal rupture with enzymatic autodigestion
D. Free radical-mediated lipid peroxidation of membranes
B. ATP depletion leading to cellular swelling and enzyme denaturation
[CORRECT]
Rationale: Coagulative necrosis, the most common pattern of ischemic cell death,
results primarily from ATP depletion causing failure of ion pumps, cellular swelling,
and denaturation of structural and enzymatic proteins. This preserves tissue outlines
while destroying nuclei. Caspase activation (A) describes apoptosis. Lysosomal
rupture (C) characterizes liquefactive necrosis. Free radical lipid peroxidation (D)
contributes to reperfusion injury but is not the primary mechanism of coagulative
necrosis.
Correct Answer: B
Q3. During reperfusion of an ischemic myocardium following successful PCI, which
pathophysiological event MOST directly contributes to the "oxygen paradox" and
exacerbation of myocardial injury?
A. Accumulation of hypoxanthine during ischemia, followed by conversion to
xanthine and uric acid with generation of superoxide radicals
B. Activation of the intrinsic apoptotic pathway via cytochrome c release
C. Opening of mitochondrial permeability transition pores with calcium overload
D. Downregulation of antioxidant enzyme synthesis
A. Accumulation of hypoxanthine during ischemia, followed by conversion to
xanthine and uric acid with generation of superoxide radicals [CORRECT]
Rationale: The oxygen paradox in reperfusion injury occurs because during ischemia,
ATP breakdown produces hypoxanthine. Upon reperfusion, xanthine oxidase
(converted from xanthine dehydrogenase during ischemia) metabolizes
,hypoxanthine using molecular oxygen, generating massive amounts of superoxide
radicals. While mitochondrial permeability transition pore opening (C) and apoptosis
(B) occur, the oxygen paradox specifically refers to the burst of ROS production from
xanthine oxidase activity.
Correct Answer: A
Q4. A 45-year-old male with chronic alcoholism presents with jaundice and
hepatomegaly. Liver biopsy shows hepatocytes with clear, empty-appearing
cytoplasm and centrally displaced nuclei. This cellular adaptation is best described as:
A. Fatty change (steatosis)
B. Hydropic change
C. Glycogen accumulation
D. Hyaline change
A. Fatty change (steatosis) [CORRECT]
Rationale: In fatty change (steatosis), triglycerides accumulate in hepatocytes as large
lipid droplets that displace the nucleus to the periphery, creating a "signet ring"
appearance. The lipid is dissolved during tissue processing, leaving clear vacuoles.
Hydropic change (B) produces smaller, water-filled vacuoles throughout cytoplasm.
Glycogen accumulation (C) in glycogen storage diseases produces a diffuse, lacy
cytoplasm without peripheral nuclear displacement. Hyaline change (D) refers to
glassy, eosinophilic material.
Correct Answer: A
Q5. A pathologist examining a breast biopsy notes cells with condensed, fragmented
nuclei and shrunken, eosinophilic cytoplasm that remain individually separated
without inflammation. Individual cells are scattered among normal tissue. This
pattern represents:
, A. Coagulative necrosis
B. Liquefactive necrosis
C. Apoptosis
D. Caseous necrosis
C. Apoptosis [CORRECT]
Rationale: Apoptosis is characterized by cell shrinkage, chromatin condensation
(pyknosis), nuclear fragmentation (karyorrhexis), formation of apoptotic bodies, and
absence of inflammation. The scattered individual cell death pattern distinguishes it
from necrosis, which affects contiguous cells and incites inflammation. Coagulative
necrosis (A) preserves architecture. Liquefactive necrosis (B) involves enzymatic
digestion. Caseous necrosis (D) shows amorphous, eosinophilic debris with
granulomatous inflammation.
Correct Answer: C
Q6. In a patient with chronic mitral regurgitation, the left ventricle demonstrates an
increase in myocyte size with proportional increases in contractile proteins and
organelles. This represents:
A. Physiologic hypertrophy
B. Pathologic hypertrophy
C. Hyperplasia
D. Anaplasia
B. Pathologic hypertrophy [CORRECT]
Rationale: Pathologic hypertrophy occurs in response to increased workload or stress
(pressure/volume overload) and, unlike physiologic hypertrophy (exercise-induced),
is associated with eventual decompensation, fibrosis, and heart failure. In chronic
mitral regurgitation, volume overload triggers eccentric hypertrophy. Hyperplasia (C)
involves increased cell number, which adult cardiac myocytes cannot undergo.
Anaplasia (D) refers to loss of differentiation in malignancy.
Correct Answer: B
STUDY GUIDE 2026/2027 | Graded A Questions &
Answers | AACN Essentials | Pass Guaranteed - A+ Graded
Section 1: Cellular Adaptation, Injury & Neoplasia (Questions 1-
15)
Q1. A 68-year-old male with a 40-pack-year smoking history presents with chronic
cough and hemoptysis. Biopsy of a lung lesion reveals cells with enlarged,
hyperchromatic nuclei, high nuclear-to-cytoplasmic ratio, and disorganized
architecture with loss of polarity. These findings are most consistent with which type
of cellular adaptation or response?
A. Hyperplasia
B. Metaplasia
C. Dysplasia
D. Hypertrophy
C. Dysplasia [CORRECT]
Rationale: Dysplasia is characterized by disordered cell growth with nuclear
pleomorphism, hyperchromatism, increased nuclear-to-cytoplasmic ratio, and loss of
normal tissue architecture. Unlike metaplasia (reversible change of one differentiated
cell type to another) or hyperplasia (increase in cell number), dysplasia represents a
pre-neoplastic change that may progress to carcinoma in situ. Hypertrophy involves
increased cell size without nuclear atypia.
Correct Answer: C
Q2. A 72-year-old female with poorly controlled type 2 diabetes presents with a non-
healing foot ulcer. Histopathology reveals coagulative necrosis with preservation of
,tissue architecture but loss of nuclei. Which mechanism is the PRIMARY driver of this
cell death pattern?
A. Activation of caspases and DNA fragmentation
B. ATP depletion leading to cellular swelling and enzyme denaturation
C. Lysosomal rupture with enzymatic autodigestion
D. Free radical-mediated lipid peroxidation of membranes
B. ATP depletion leading to cellular swelling and enzyme denaturation
[CORRECT]
Rationale: Coagulative necrosis, the most common pattern of ischemic cell death,
results primarily from ATP depletion causing failure of ion pumps, cellular swelling,
and denaturation of structural and enzymatic proteins. This preserves tissue outlines
while destroying nuclei. Caspase activation (A) describes apoptosis. Lysosomal
rupture (C) characterizes liquefactive necrosis. Free radical lipid peroxidation (D)
contributes to reperfusion injury but is not the primary mechanism of coagulative
necrosis.
Correct Answer: B
Q3. During reperfusion of an ischemic myocardium following successful PCI, which
pathophysiological event MOST directly contributes to the "oxygen paradox" and
exacerbation of myocardial injury?
A. Accumulation of hypoxanthine during ischemia, followed by conversion to
xanthine and uric acid with generation of superoxide radicals
B. Activation of the intrinsic apoptotic pathway via cytochrome c release
C. Opening of mitochondrial permeability transition pores with calcium overload
D. Downregulation of antioxidant enzyme synthesis
A. Accumulation of hypoxanthine during ischemia, followed by conversion to
xanthine and uric acid with generation of superoxide radicals [CORRECT]
Rationale: The oxygen paradox in reperfusion injury occurs because during ischemia,
ATP breakdown produces hypoxanthine. Upon reperfusion, xanthine oxidase
(converted from xanthine dehydrogenase during ischemia) metabolizes
,hypoxanthine using molecular oxygen, generating massive amounts of superoxide
radicals. While mitochondrial permeability transition pore opening (C) and apoptosis
(B) occur, the oxygen paradox specifically refers to the burst of ROS production from
xanthine oxidase activity.
Correct Answer: A
Q4. A 45-year-old male with chronic alcoholism presents with jaundice and
hepatomegaly. Liver biopsy shows hepatocytes with clear, empty-appearing
cytoplasm and centrally displaced nuclei. This cellular adaptation is best described as:
A. Fatty change (steatosis)
B. Hydropic change
C. Glycogen accumulation
D. Hyaline change
A. Fatty change (steatosis) [CORRECT]
Rationale: In fatty change (steatosis), triglycerides accumulate in hepatocytes as large
lipid droplets that displace the nucleus to the periphery, creating a "signet ring"
appearance. The lipid is dissolved during tissue processing, leaving clear vacuoles.
Hydropic change (B) produces smaller, water-filled vacuoles throughout cytoplasm.
Glycogen accumulation (C) in glycogen storage diseases produces a diffuse, lacy
cytoplasm without peripheral nuclear displacement. Hyaline change (D) refers to
glassy, eosinophilic material.
Correct Answer: A
Q5. A pathologist examining a breast biopsy notes cells with condensed, fragmented
nuclei and shrunken, eosinophilic cytoplasm that remain individually separated
without inflammation. Individual cells are scattered among normal tissue. This
pattern represents:
, A. Coagulative necrosis
B. Liquefactive necrosis
C. Apoptosis
D. Caseous necrosis
C. Apoptosis [CORRECT]
Rationale: Apoptosis is characterized by cell shrinkage, chromatin condensation
(pyknosis), nuclear fragmentation (karyorrhexis), formation of apoptotic bodies, and
absence of inflammation. The scattered individual cell death pattern distinguishes it
from necrosis, which affects contiguous cells and incites inflammation. Coagulative
necrosis (A) preserves architecture. Liquefactive necrosis (B) involves enzymatic
digestion. Caseous necrosis (D) shows amorphous, eosinophilic debris with
granulomatous inflammation.
Correct Answer: C
Q6. In a patient with chronic mitral regurgitation, the left ventricle demonstrates an
increase in myocyte size with proportional increases in contractile proteins and
organelles. This represents:
A. Physiologic hypertrophy
B. Pathologic hypertrophy
C. Hyperplasia
D. Anaplasia
B. Pathologic hypertrophy [CORRECT]
Rationale: Pathologic hypertrophy occurs in response to increased workload or stress
(pressure/volume overload) and, unlike physiologic hypertrophy (exercise-induced),
is associated with eventual decompensation, fibrosis, and heart failure. In chronic
mitral regurgitation, volume overload triggers eccentric hypertrophy. Hyperplasia (C)
involves increased cell number, which adult cardiac myocytes cannot undergo.
Anaplasia (D) refers to loss of differentiation in malignancy.
Correct Answer: B
