GCU NUR 634 Midterm Exam – Grand
Canyon University College of Nursing –
2026/2027 Academic Year MSN-Level
Multiple-Choice Questions with Answers
and Rationales
Question 1: A 68-year-old male with long-standing, uncontrolled
hypertension presents with progressive dyspnea on exertion. An
echocardiogram reveals concentric left ventricular hypertrophy
(LVH) with an ejection fraction of 52%. At the cellular level, which of
the following best describes the pathophysiological signal
transduction pathway that initiates this ventricular adaptation?
A. Chronic mechanical stretch activates G-protein-coupled receptors and
integrins, stimulating downstream mitogen-activated protein kinase
(MAPK) cascades and protein synthesis without cellular replication.
B. Hypoxia-inducible factor 1-alpha (HIF-1α) is downregulated, leading to a
reduction in sarcomeric protein assembly.
C. Intracellular calcium depletion inhibits calcineurin, preventing the
transcription of fetal gene programs.
D. Increased vascular resistance triggers cellular metaplasia of myocardial
cells into skeletal muscle phenotypes.
Correct Answer:-A
Rationale: Pathological hypertrophy of cardiac muscle in response to
chronic mechanical overload (hypertension) is mediated by mechanical
stretch sensors (integrins) and neurohumoral factors (angiotensin II,
endothelin-1, norepinephrine) binding to G-protein-coupled receptors.
This activates intracellular signaling cascades, particularly the MAPK and
PI3K/Akt pathways, leading to increased transcription of protein synthesis
and sarcomere duplication. Since myocardial cells are terminally
,differentiated, they cannot divide (no cellular replication), resulting in
hypertrophy of existing myocytes rather than hyperplasia.
Question 2: A 52-year-old female with chronic gastroesophageal
reflux disease (GERD) undergoes an esophagogastroduodenoscopy
(EGD). A biopsy of the distal esophagus reveals that the normal
stratified squamous epithelium has been replaced by simple
columnar epithelium with goblet cells (Barrett's Esophagus). What is
the cellular classification of this finding, and what is its primary
clinical implication?
A. Dysplasia; it represents an irreversible cellular degeneration that leads
directly to tissue necrosis.
B. Metaplasia; it is a reversible reprogramming of epithelial stem cells that
serves as a protective mechanism but increases the risk of esophageal
adenocarcinoma.
C. Atrophy; it is characterized by a decrease in cell size and protein
synthesis to reduce metabolic demand under acidic conditions.
D. Anaplasia; it represents a benign cellular adaptation that never
progresses to malignancy.
Correct Answer:-B
Rationale: Metaplasia is a reversible cellular adaptation where one mature
cell type is replaced by another mature cell type better suited to withstand
a hostile environment. In Barrett's esophagus, chronic exposure to gastric
acid reprograms esophageal stem cells to differentiate into columnar
epithelium with goblet cells (intestinal metaplasia), which is more acid-
resistant. While protective in the short term, this metaplastic tissue is
highly unstable and can progress to dysplasia and esophageal
adenocarcinoma if the acid exposure is not controlled.
Question 3: During an ischemic stroke, sudden occlusion of the
middle cerebral artery deprives neurons of oxygen and glucose.
Which of the following sequential biochemical events represents the
,primary pathway leading to acute ischemic cellular swelling and
necrosis?
A. ATP depletion → activation of the Na+/K+ ATPase pump → extracellular
sodium influx → cell dehydration.
B. ATP depletion → failure of the Na+/K+ ATPase pump → intracellular
sodium and water accumulation → influx of calcium → mitochondrial
membrane damage.
C. Downregulation of anaerobic glycolysis → lactic acid depletion → cellular
alkalosis → lysosomal enzyme inactivation.
D. Efflux of intracellular calcium → inhibition of phospholipases →
breakdown of cellular phospholipids.
Correct Answer:-B
Rationale: Ischemia stops oxidative phosphorylation, causing rapid ATP
depletion. The lack of ATP causes failure of the active Na+/K+ ATPase
pump, leading to intracellular accumulation of sodium and water (causing
cytotoxic edema/swelling). Concurrently, the ATP-dependent Ca2+ ATPase
pumps fail, causing a massive influx of extracellular calcium. High
intracellular calcium activates destructive enzymes (phospholipases,
proteases, endonucleases) and causes mitochondrial permeability
transition, destroying the cell membrane and leading to necrosis.
Question 4: A 45-year-old male is admitted with a severe myocardial
infarction and undergoes successful percutaneous coronary
intervention (PCI) to restore blood flow. Several hours after
reperfusion, the patient exhibits myocardial stunning and an increase
in serum troponin. What is the primary cellular mechanism behind
this reperfusion injury?
A. Restoration of blood flow delivers oxygen that reacts with damaged
mitochondria, generating excessive reactive oxygen species (ROS) that
cause lipid peroxidation and membrane damage.
B. Reoxygenation causes immediate intracellular alkalosis, which
inactivates proteolytic enzymes and protects the cell.
, C. Restoration of blood flow causes a sudden efflux of extracellular sodium,
leading to cell shrinkage and apoptosis.
D. Reperfusion stimulates the immediate down-regulation of adhesion
molecules on vascular endothelial cells, blocking neutrophil infiltration.
Correct Answer:-A
Rationale: Myocardial reperfusion injury occurs when blood flow is
restored to previously ischemic tissue. The sudden reintroduction of
oxygen to cells with damaged mitochondria leads to incomplete reduction
of oxygen, producing massive quantities of reactive oxygen species (ROS),
such as superoxide radicals and hydrogen peroxide. These free radicals
cause lipid peroxidation of membrane lipids, open mitochondrial
permeability transition pores, and trigger further intracellular calcium
overload, worsening cell injury and cell death.
Question 5: A 58-year-old male with chronic alcohol use disorder is
evaluated for abdominal pain. A liver biopsy reveals macrovesicular
steatosis (hepatic lipid accumulation). Which of the following
pathophysiological mechanisms explains this intracellular
accumulation in hepatocytes?
A. Alcohol use increases the activity of lipoprotein lipase, accelerating the
peripheral storage of fatty acids.
B. Ethanol metabolism generates excessive NADH, which stimulates fatty
acid synthesis and inhibits mitochondrial beta-oxidation, leading to lipid
accumulation.
C. Ethanol blocks the synthesis of apoproteins, leading to the rapid efflux of
cholesterol from hepatocytes.
D. Chronic alcohol use stimulates hepatic glycogenolysis, which directly
converts glycogen into triglycerides.
Correct Answer:-B
Rationale: Hepatic steatosis in chronic alcohol use is driven by altered
hepatocyte metabolism. The oxidation of ethanol by alcohol dehydrogenase
Canyon University College of Nursing –
2026/2027 Academic Year MSN-Level
Multiple-Choice Questions with Answers
and Rationales
Question 1: A 68-year-old male with long-standing, uncontrolled
hypertension presents with progressive dyspnea on exertion. An
echocardiogram reveals concentric left ventricular hypertrophy
(LVH) with an ejection fraction of 52%. At the cellular level, which of
the following best describes the pathophysiological signal
transduction pathway that initiates this ventricular adaptation?
A. Chronic mechanical stretch activates G-protein-coupled receptors and
integrins, stimulating downstream mitogen-activated protein kinase
(MAPK) cascades and protein synthesis without cellular replication.
B. Hypoxia-inducible factor 1-alpha (HIF-1α) is downregulated, leading to a
reduction in sarcomeric protein assembly.
C. Intracellular calcium depletion inhibits calcineurin, preventing the
transcription of fetal gene programs.
D. Increased vascular resistance triggers cellular metaplasia of myocardial
cells into skeletal muscle phenotypes.
Correct Answer:-A
Rationale: Pathological hypertrophy of cardiac muscle in response to
chronic mechanical overload (hypertension) is mediated by mechanical
stretch sensors (integrins) and neurohumoral factors (angiotensin II,
endothelin-1, norepinephrine) binding to G-protein-coupled receptors.
This activates intracellular signaling cascades, particularly the MAPK and
PI3K/Akt pathways, leading to increased transcription of protein synthesis
and sarcomere duplication. Since myocardial cells are terminally
,differentiated, they cannot divide (no cellular replication), resulting in
hypertrophy of existing myocytes rather than hyperplasia.
Question 2: A 52-year-old female with chronic gastroesophageal
reflux disease (GERD) undergoes an esophagogastroduodenoscopy
(EGD). A biopsy of the distal esophagus reveals that the normal
stratified squamous epithelium has been replaced by simple
columnar epithelium with goblet cells (Barrett's Esophagus). What is
the cellular classification of this finding, and what is its primary
clinical implication?
A. Dysplasia; it represents an irreversible cellular degeneration that leads
directly to tissue necrosis.
B. Metaplasia; it is a reversible reprogramming of epithelial stem cells that
serves as a protective mechanism but increases the risk of esophageal
adenocarcinoma.
C. Atrophy; it is characterized by a decrease in cell size and protein
synthesis to reduce metabolic demand under acidic conditions.
D. Anaplasia; it represents a benign cellular adaptation that never
progresses to malignancy.
Correct Answer:-B
Rationale: Metaplasia is a reversible cellular adaptation where one mature
cell type is replaced by another mature cell type better suited to withstand
a hostile environment. In Barrett's esophagus, chronic exposure to gastric
acid reprograms esophageal stem cells to differentiate into columnar
epithelium with goblet cells (intestinal metaplasia), which is more acid-
resistant. While protective in the short term, this metaplastic tissue is
highly unstable and can progress to dysplasia and esophageal
adenocarcinoma if the acid exposure is not controlled.
Question 3: During an ischemic stroke, sudden occlusion of the
middle cerebral artery deprives neurons of oxygen and glucose.
Which of the following sequential biochemical events represents the
,primary pathway leading to acute ischemic cellular swelling and
necrosis?
A. ATP depletion → activation of the Na+/K+ ATPase pump → extracellular
sodium influx → cell dehydration.
B. ATP depletion → failure of the Na+/K+ ATPase pump → intracellular
sodium and water accumulation → influx of calcium → mitochondrial
membrane damage.
C. Downregulation of anaerobic glycolysis → lactic acid depletion → cellular
alkalosis → lysosomal enzyme inactivation.
D. Efflux of intracellular calcium → inhibition of phospholipases →
breakdown of cellular phospholipids.
Correct Answer:-B
Rationale: Ischemia stops oxidative phosphorylation, causing rapid ATP
depletion. The lack of ATP causes failure of the active Na+/K+ ATPase
pump, leading to intracellular accumulation of sodium and water (causing
cytotoxic edema/swelling). Concurrently, the ATP-dependent Ca2+ ATPase
pumps fail, causing a massive influx of extracellular calcium. High
intracellular calcium activates destructive enzymes (phospholipases,
proteases, endonucleases) and causes mitochondrial permeability
transition, destroying the cell membrane and leading to necrosis.
Question 4: A 45-year-old male is admitted with a severe myocardial
infarction and undergoes successful percutaneous coronary
intervention (PCI) to restore blood flow. Several hours after
reperfusion, the patient exhibits myocardial stunning and an increase
in serum troponin. What is the primary cellular mechanism behind
this reperfusion injury?
A. Restoration of blood flow delivers oxygen that reacts with damaged
mitochondria, generating excessive reactive oxygen species (ROS) that
cause lipid peroxidation and membrane damage.
B. Reoxygenation causes immediate intracellular alkalosis, which
inactivates proteolytic enzymes and protects the cell.
, C. Restoration of blood flow causes a sudden efflux of extracellular sodium,
leading to cell shrinkage and apoptosis.
D. Reperfusion stimulates the immediate down-regulation of adhesion
molecules on vascular endothelial cells, blocking neutrophil infiltration.
Correct Answer:-A
Rationale: Myocardial reperfusion injury occurs when blood flow is
restored to previously ischemic tissue. The sudden reintroduction of
oxygen to cells with damaged mitochondria leads to incomplete reduction
of oxygen, producing massive quantities of reactive oxygen species (ROS),
such as superoxide radicals and hydrogen peroxide. These free radicals
cause lipid peroxidation of membrane lipids, open mitochondrial
permeability transition pores, and trigger further intracellular calcium
overload, worsening cell injury and cell death.
Question 5: A 58-year-old male with chronic alcohol use disorder is
evaluated for abdominal pain. A liver biopsy reveals macrovesicular
steatosis (hepatic lipid accumulation). Which of the following
pathophysiological mechanisms explains this intracellular
accumulation in hepatocytes?
A. Alcohol use increases the activity of lipoprotein lipase, accelerating the
peripheral storage of fatty acids.
B. Ethanol metabolism generates excessive NADH, which stimulates fatty
acid synthesis and inhibits mitochondrial beta-oxidation, leading to lipid
accumulation.
C. Ethanol blocks the synthesis of apoproteins, leading to the rapid efflux of
cholesterol from hepatocytes.
D. Chronic alcohol use stimulates hepatic glycogenolysis, which directly
converts glycogen into triglycerides.
Correct Answer:-B
Rationale: Hepatic steatosis in chronic alcohol use is driven by altered
hepatocyte metabolism. The oxidation of ethanol by alcohol dehydrogenase
