MSN 570 Advanced Pathophysiology - Midterm Exam | 50 Questions Latest 2026/2027 Update | USU
MSN 570 Midterm Exam | 50 Questions and Answers
Advanced Pathophysiology - Latest 2026/2027 Update | 100% Correct - USU
Uniformed Services University - Graduate Nursing Education
This comprehensive midterm examination spans modules 1-4 of the MSN 570 Advanced Pathophysiology
curriculum at the Uniformed Services University. The 50 questions cover cellular injury, inflammation and
immunity, genetics, neoplasia, fluid and electrolyte disorders, cardiovascular pathophysiology, and
hematologic disorders. Each question includes a graduate-level rationale with mechanism-level explanations
and clinical correlation. Many questions reflect USU graduate nursing competencies and include clinical
scenarios relevant to military and federal healthcare contexts where applicable.
MSN 570 Midterm Exam - USU Graduate Nursing Page 1
,MSN 570 Advanced Pathophysiology - Midterm Exam | 50 Questions Latest 2026/2027 Update | USU
Section 1: Cellular Injury, Adaptation, and Death (Cellular Stress, Necrosis, Apoptosis, &
Free Radical Injury)
Questions 1-7
Q1: A 68-year-old male with long-standing GERD undergoes endoscopy, and the distal esophagus shows
columnar metaplasia replacing normal squamous epithelium. Which cellular adaptation has occurred, and
what is its primary clinical significance?
A. Atrophy; decreased functional capacity due to disuse
B. Metaplasia; adaptive substitution of one differentiated cell type for another, with increased malignancy risk
[CORRECT]
C. Dysplasia; disordered growth representing a premalignant neoplastic process
D. Hyperplasia; increased cell number in response to hormonal stimulation
Correct Answer: B
Rationale: Barrett esophagus is the classic example of metaplasia, the reversible substitution of one differentiated cell type
(stratified squamous) for another (columnar/intestinal-type) in response to chronic acid injury. Unlike hyperplasia (increased
cell number) or hypertrophy (increased cell size), metaplasia is a reprogramming of stem cell differentiation. While adaptive, it
confers significantly increased risk of adenocarcinoma, distinguishing it from purely benign adaptations.
Q2: A researcher examines tissue following ischemic injury and notes cell swelling, fatty change, and
rupture of lysosomes, with an inflammatory infiltrate. The plasma membranes are disrupted. Which
finding most reliably distinguishes necrosis from apoptosis in this specimen?
A. Cellular shrinkage and chromatin condensation
B. Adjacent inflammatory infiltrate and loss of membrane integrity with enzymatic digestion [CORRECT]
C. Caspase activation and apoptotic body formation
D. Energy-dependent programmed execution with minimal inflammation
Correct Answer: B
Rationale: Necrosis is characterized by cell swelling, membrane rupture, lysosomal enzyme release, and a robust
inflammatory response due to release of damage-associated molecular patterns (DAMPs). In contrast, apoptosis involves cell
shrinkage, chromatin condensation, caspase-mediated cleavage, apoptotic body formation, and minimal inflammation
because the membrane remains intact and the contents are packaged for phagocytosis. The presence of adjacent
inflammation and loss of membrane integrity are the key discriminators.
MSN 570 Midterm Exam - USU Graduate Nursing Page 2
, MSN 570 Advanced Pathophysiology - Midterm Exam | 50 Questions Latest 2026/2027 Update | USU
Q3: A 55-year-old female presents with a myocardial infarction. Within the first 30 minutes of complete
coronary occlusion, which subcellular event is most likely the earliest reversible indicator of ischemic
injury?
A. Disruption of the plasma membrane with myelin figure formation
B. Mitochondrial transition pore opening and cytochrome c release
C. Failure of the Na+/K+-ATPase causing intracellular Na+ accumulation, cellular swelling, and ER dilation
[CORRECT]
D. Nuclear pyknosis and karyorrhexis
Correct Answer: C
Rationale: The earliest reversible manifestation of ischemic cell injury is ATP depletion, which causes failure of the
Na+/K+-ATPase. Sodium accumulates intracellularly, water follows osmotically, and the cell swells (hydropic change); the ER
detaches from ribosomes and dilates. Plasma membrane disruption, mitochondrial permeability transition pore (MPTP)
opening, and nuclear pyknosis/karyorrhexis are features of irreversible injury and cell death. The Na/K pump failure is the
initial reversible event before membrane damage occurs.
Q4: A neonate with severe hypoxic-ischemic encephalopathy exhibits neuronal cell death that is
energy-dependent, involves caspase-9 and Apaf-1, and lacks an inflammatory infiltrate. This mechanism
is best classified as:
A. Coagulative necrosis
B. Liquefactive necrosis
C. Intrinsic (mitochondrial) pathway apoptosis [CORRECT]
D. Necroptosis via RIPK1/RIPK3/MLKL
Correct Answer: C
Rationale: The intrinsic (mitochondrial) pathway of apoptosis is triggered by cytochrome c release from damaged
mitochondria, formation of the apoptosome (cytochrome c + Apaf-1 + procaspase-9), activation of caspase-9, and
downstream executioner caspases (3, 6, 7). It is energy-dependent (requires ATP for the apoptosome) and characteristically
lacks inflammation. Necroptosis is a regulated necrotic pathway (RIPK1/RIPK3/MLKL) that does produce inflammation.
Coagulative necrosis preserves tissue architecture and is typical of ischemic injury in most organs except the brain.
Q5: An 8-year-old boy with X-linked chronic granulomatous disease (CGD) develops recurrent infections
with catalase-positive organisms such as Staphylococcus aureus and Aspergillus. Which
pathophysiologic mechanism directly accounts for this infection pattern?
A. Deficient NADPH oxidase in phagocytes, preventing generation of the respiratory burst and reactive oxygen
species [CORRECT]
B. Deficient myeloperoxidase, preventing hypochlorous acid generation
C. Deficient adhesion molecules (CD18 integrin), preventing diapedesis
D. Deficient lysosomal enzymes, preventing intracellular killing
Correct Answer: A
Rationale: CGD results from mutations in components of the phagocyte NADPH oxidase complex (gp91phox, p47phox,
p67phox, p22phox), eliminating the respiratory burst and the generation of superoxide, hydrogen peroxide, and downstream
ROS. Catalase-positive organisms survive because they degrade the small amounts of H2O2 they produce, depriving
phagocytes of substrate for myeloperoxidase-mediated killing. MPO deficiency causes Candida susceptibility but not the CGD
phenotype; LAD-1 (CD18 deficiency) causes delayed wound healing and absent pus.
MSN 570 Midterm Exam - USU Graduate Nursing Page 3
MSN 570 Midterm Exam | 50 Questions and Answers
Advanced Pathophysiology - Latest 2026/2027 Update | 100% Correct - USU
Uniformed Services University - Graduate Nursing Education
This comprehensive midterm examination spans modules 1-4 of the MSN 570 Advanced Pathophysiology
curriculum at the Uniformed Services University. The 50 questions cover cellular injury, inflammation and
immunity, genetics, neoplasia, fluid and electrolyte disorders, cardiovascular pathophysiology, and
hematologic disorders. Each question includes a graduate-level rationale with mechanism-level explanations
and clinical correlation. Many questions reflect USU graduate nursing competencies and include clinical
scenarios relevant to military and federal healthcare contexts where applicable.
MSN 570 Midterm Exam - USU Graduate Nursing Page 1
,MSN 570 Advanced Pathophysiology - Midterm Exam | 50 Questions Latest 2026/2027 Update | USU
Section 1: Cellular Injury, Adaptation, and Death (Cellular Stress, Necrosis, Apoptosis, &
Free Radical Injury)
Questions 1-7
Q1: A 68-year-old male with long-standing GERD undergoes endoscopy, and the distal esophagus shows
columnar metaplasia replacing normal squamous epithelium. Which cellular adaptation has occurred, and
what is its primary clinical significance?
A. Atrophy; decreased functional capacity due to disuse
B. Metaplasia; adaptive substitution of one differentiated cell type for another, with increased malignancy risk
[CORRECT]
C. Dysplasia; disordered growth representing a premalignant neoplastic process
D. Hyperplasia; increased cell number in response to hormonal stimulation
Correct Answer: B
Rationale: Barrett esophagus is the classic example of metaplasia, the reversible substitution of one differentiated cell type
(stratified squamous) for another (columnar/intestinal-type) in response to chronic acid injury. Unlike hyperplasia (increased
cell number) or hypertrophy (increased cell size), metaplasia is a reprogramming of stem cell differentiation. While adaptive, it
confers significantly increased risk of adenocarcinoma, distinguishing it from purely benign adaptations.
Q2: A researcher examines tissue following ischemic injury and notes cell swelling, fatty change, and
rupture of lysosomes, with an inflammatory infiltrate. The plasma membranes are disrupted. Which
finding most reliably distinguishes necrosis from apoptosis in this specimen?
A. Cellular shrinkage and chromatin condensation
B. Adjacent inflammatory infiltrate and loss of membrane integrity with enzymatic digestion [CORRECT]
C. Caspase activation and apoptotic body formation
D. Energy-dependent programmed execution with minimal inflammation
Correct Answer: B
Rationale: Necrosis is characterized by cell swelling, membrane rupture, lysosomal enzyme release, and a robust
inflammatory response due to release of damage-associated molecular patterns (DAMPs). In contrast, apoptosis involves cell
shrinkage, chromatin condensation, caspase-mediated cleavage, apoptotic body formation, and minimal inflammation
because the membrane remains intact and the contents are packaged for phagocytosis. The presence of adjacent
inflammation and loss of membrane integrity are the key discriminators.
MSN 570 Midterm Exam - USU Graduate Nursing Page 2
, MSN 570 Advanced Pathophysiology - Midterm Exam | 50 Questions Latest 2026/2027 Update | USU
Q3: A 55-year-old female presents with a myocardial infarction. Within the first 30 minutes of complete
coronary occlusion, which subcellular event is most likely the earliest reversible indicator of ischemic
injury?
A. Disruption of the plasma membrane with myelin figure formation
B. Mitochondrial transition pore opening and cytochrome c release
C. Failure of the Na+/K+-ATPase causing intracellular Na+ accumulation, cellular swelling, and ER dilation
[CORRECT]
D. Nuclear pyknosis and karyorrhexis
Correct Answer: C
Rationale: The earliest reversible manifestation of ischemic cell injury is ATP depletion, which causes failure of the
Na+/K+-ATPase. Sodium accumulates intracellularly, water follows osmotically, and the cell swells (hydropic change); the ER
detaches from ribosomes and dilates. Plasma membrane disruption, mitochondrial permeability transition pore (MPTP)
opening, and nuclear pyknosis/karyorrhexis are features of irreversible injury and cell death. The Na/K pump failure is the
initial reversible event before membrane damage occurs.
Q4: A neonate with severe hypoxic-ischemic encephalopathy exhibits neuronal cell death that is
energy-dependent, involves caspase-9 and Apaf-1, and lacks an inflammatory infiltrate. This mechanism
is best classified as:
A. Coagulative necrosis
B. Liquefactive necrosis
C. Intrinsic (mitochondrial) pathway apoptosis [CORRECT]
D. Necroptosis via RIPK1/RIPK3/MLKL
Correct Answer: C
Rationale: The intrinsic (mitochondrial) pathway of apoptosis is triggered by cytochrome c release from damaged
mitochondria, formation of the apoptosome (cytochrome c + Apaf-1 + procaspase-9), activation of caspase-9, and
downstream executioner caspases (3, 6, 7). It is energy-dependent (requires ATP for the apoptosome) and characteristically
lacks inflammation. Necroptosis is a regulated necrotic pathway (RIPK1/RIPK3/MLKL) that does produce inflammation.
Coagulative necrosis preserves tissue architecture and is typical of ischemic injury in most organs except the brain.
Q5: An 8-year-old boy with X-linked chronic granulomatous disease (CGD) develops recurrent infections
with catalase-positive organisms such as Staphylococcus aureus and Aspergillus. Which
pathophysiologic mechanism directly accounts for this infection pattern?
A. Deficient NADPH oxidase in phagocytes, preventing generation of the respiratory burst and reactive oxygen
species [CORRECT]
B. Deficient myeloperoxidase, preventing hypochlorous acid generation
C. Deficient adhesion molecules (CD18 integrin), preventing diapedesis
D. Deficient lysosomal enzymes, preventing intracellular killing
Correct Answer: A
Rationale: CGD results from mutations in components of the phagocyte NADPH oxidase complex (gp91phox, p47phox,
p67phox, p22phox), eliminating the respiratory burst and the generation of superoxide, hydrogen peroxide, and downstream
ROS. Catalase-positive organisms survive because they degrade the small amounts of H2O2 they produce, depriving
phagocytes of substrate for myeloperoxidase-mediated killing. MPO deficiency causes Candida susceptibility but not the CGD
phenotype; LAD-1 (CD18 deficiency) causes delayed wound healing and absent pus.
MSN 570 Midterm Exam - USU Graduate Nursing Page 3
