,NSG 5140 Exam 1 Advanced Pathophysiology Questions And
Answers 2026/2027 South College
Q1. A 67-year-old client with chronic hypertension develops
concentric left ventricular hypertrophy. Echocardiography shows
increased ventricular wall thickness without an equivalent increase
in chamber volume. Which cellular mechanism primarily accounts
for this adaptation?
A) Increased cardiomyocyte proliferation through mitosis
B) Replacement of mature cardiomyocytes with adipocytes
C) Increased synthesis of contractile proteins within existing cardiomyocytes
D) Reduction in myocardial protein production
Correct Answer: C) Increased synthesis of contractile proteins within existing
cardiomyocytes
Rationale: Cardiac hypertrophy develops primarily through increased
cardiomyocyte size rather than increased cell number because mature
cardiomyocytes have limited proliferative capacity. Chronic pressure overload
activates mechanotransduction and neurohormonal signaling pathways that
increase sarcomeric protein synthesis. Persistent hypertrophy may
eventually impair ventricular relaxation, increase oxygen demand, and
promote myocardial fibrosis.
Q2. A 54-year-old client with chronic gastroesophageal reflux
undergoes endoscopy. Biopsy reveals replacement of the normal
stratified squamous epithelium of the distal esophagus with
intestinal-type columnar epithelium containing goblet cells. Which
cellular adaptation has occurred?
A) Metaplasia
B) Hyperplasia
C) Dysplasia
D) Hypertrophy
Correct Answer: A) Metaplasia
Rationale: Metaplasia is a reversible adaptive change in which one
differentiated cell type is replaced by another better suited to a persistent
environmental stressor. In Barrett esophagus, chronic acid exposure
,promotes intestinal-type columnar differentiation. Although initially adaptive,
this change increases the risk of dysplasia and esophageal adenocarcinoma.
Q3. A 46-year-old client experiences prolonged lower-extremity
immobilization after a fracture. Several weeks later, the affected
quadriceps muscle has decreased substantially in size. Which
cellular process primarily contributes to this finding?
A) Increased ribosomal protein synthesis
B) Increased mitotic activity of mature skeletal muscle fibers
C) Excessive extracellular matrix calcification
D) Reduced protein synthesis and increased degradation of cellular proteins
Correct Answer: D) Reduced protein synthesis and increased degradation of
cellular proteins
Rationale: Disuse atrophy develops when reduced mechanical stimulation
shifts cellular metabolism toward protein breakdown. The ubiquitin-
proteasome system and autophagy contribute to degradation of intracellular
proteins and organelles. The resulting decrease in muscle fiber size reduces
strength and functional capacity.
Q4. A tissue specimen obtained after a prolonged episode of
ischemia demonstrates cellular swelling, loss of membrane
integrity, mitochondrial damage, and leakage of intracellular
enzymes. Which process best explains the progression from
reversible to irreversible cellular injury?
A) Increased mitochondrial ATP production
B) Severe mitochondrial dysfunction and loss of plasma membrane integrity
C) Enhanced intracellular calcium regulation
D) Complete restoration of oxidative phosphorylation
Correct Answer: B) Severe mitochondrial dysfunction and loss of plasma
membrane integrity
Rationale: Early ischemic injury reduces ATP production, disrupting ion
pumps and causing cellular swelling. Prolonged injury produces severe
mitochondrial dysfunction, calcium overload, oxidative damage, and
irreversible membrane injury. Loss of membrane integrity permits
intracellular enzymes to escape and contributes to necrotic cell death.
, Q5. A 63-year-old client develops acute myocardial ischemia. Within
minutes, cardiomyocytes experience reduced ATP synthesis and
impaired sodium-potassium ATPase activity. Which intracellular
change occurs first?
A) Increased sodium and water accumulation with cellular swelling
B) Increased potassium retention caused by enhanced pump activity
C) Immediate replacement of injured cells with fibrous tissue
D) Complete restoration of membrane ion gradients
Correct Answer: A) Increased sodium and water accumulation with cellular
swelling
Rationale: ATP depletion impairs sodium-potassium ATPase activity, allowing
intracellular sodium accumulation and potassium loss. Water follows sodium
into cells, producing hydropic swelling. This represents a potentially
reversible stage of cellular injury if oxygen delivery and ATP production are
restored promptly.
Q6. A 58-year-old client undergoes coronary reperfusion following a
prolonged myocardial infarction. Despite restoration of blood flow,
additional myocardial injury develops. Which mechanism most
directly contributes to ischemia-reperfusion injury?
A) Complete suppression of intracellular calcium entry
B) Permanent inhibition of inflammatory cell recruitment
C) Reactive oxygen species generation, calcium overload, and mitochondrial
permeability transition
D) Immediate elimination of damaged cellular components
Correct Answer: C) Reactive oxygen species generation, calcium overload,
and mitochondrial permeability transition
Rationale: Reperfusion restores oxygen delivery but may trigger bursts of
reactive oxygen species, inflammatory activation, and intracellular calcium
accumulation. Opening of mitochondrial permeability transition pores can
disrupt energy production and promote cell death. The severity of
reperfusion injury depends on the duration of ischemia and the extent of
prior cellular damage.
Answers 2026/2027 South College
Q1. A 67-year-old client with chronic hypertension develops
concentric left ventricular hypertrophy. Echocardiography shows
increased ventricular wall thickness without an equivalent increase
in chamber volume. Which cellular mechanism primarily accounts
for this adaptation?
A) Increased cardiomyocyte proliferation through mitosis
B) Replacement of mature cardiomyocytes with adipocytes
C) Increased synthesis of contractile proteins within existing cardiomyocytes
D) Reduction in myocardial protein production
Correct Answer: C) Increased synthesis of contractile proteins within existing
cardiomyocytes
Rationale: Cardiac hypertrophy develops primarily through increased
cardiomyocyte size rather than increased cell number because mature
cardiomyocytes have limited proliferative capacity. Chronic pressure overload
activates mechanotransduction and neurohormonal signaling pathways that
increase sarcomeric protein synthesis. Persistent hypertrophy may
eventually impair ventricular relaxation, increase oxygen demand, and
promote myocardial fibrosis.
Q2. A 54-year-old client with chronic gastroesophageal reflux
undergoes endoscopy. Biopsy reveals replacement of the normal
stratified squamous epithelium of the distal esophagus with
intestinal-type columnar epithelium containing goblet cells. Which
cellular adaptation has occurred?
A) Metaplasia
B) Hyperplasia
C) Dysplasia
D) Hypertrophy
Correct Answer: A) Metaplasia
Rationale: Metaplasia is a reversible adaptive change in which one
differentiated cell type is replaced by another better suited to a persistent
environmental stressor. In Barrett esophagus, chronic acid exposure
,promotes intestinal-type columnar differentiation. Although initially adaptive,
this change increases the risk of dysplasia and esophageal adenocarcinoma.
Q3. A 46-year-old client experiences prolonged lower-extremity
immobilization after a fracture. Several weeks later, the affected
quadriceps muscle has decreased substantially in size. Which
cellular process primarily contributes to this finding?
A) Increased ribosomal protein synthesis
B) Increased mitotic activity of mature skeletal muscle fibers
C) Excessive extracellular matrix calcification
D) Reduced protein synthesis and increased degradation of cellular proteins
Correct Answer: D) Reduced protein synthesis and increased degradation of
cellular proteins
Rationale: Disuse atrophy develops when reduced mechanical stimulation
shifts cellular metabolism toward protein breakdown. The ubiquitin-
proteasome system and autophagy contribute to degradation of intracellular
proteins and organelles. The resulting decrease in muscle fiber size reduces
strength and functional capacity.
Q4. A tissue specimen obtained after a prolonged episode of
ischemia demonstrates cellular swelling, loss of membrane
integrity, mitochondrial damage, and leakage of intracellular
enzymes. Which process best explains the progression from
reversible to irreversible cellular injury?
A) Increased mitochondrial ATP production
B) Severe mitochondrial dysfunction and loss of plasma membrane integrity
C) Enhanced intracellular calcium regulation
D) Complete restoration of oxidative phosphorylation
Correct Answer: B) Severe mitochondrial dysfunction and loss of plasma
membrane integrity
Rationale: Early ischemic injury reduces ATP production, disrupting ion
pumps and causing cellular swelling. Prolonged injury produces severe
mitochondrial dysfunction, calcium overload, oxidative damage, and
irreversible membrane injury. Loss of membrane integrity permits
intracellular enzymes to escape and contributes to necrotic cell death.
, Q5. A 63-year-old client develops acute myocardial ischemia. Within
minutes, cardiomyocytes experience reduced ATP synthesis and
impaired sodium-potassium ATPase activity. Which intracellular
change occurs first?
A) Increased sodium and water accumulation with cellular swelling
B) Increased potassium retention caused by enhanced pump activity
C) Immediate replacement of injured cells with fibrous tissue
D) Complete restoration of membrane ion gradients
Correct Answer: A) Increased sodium and water accumulation with cellular
swelling
Rationale: ATP depletion impairs sodium-potassium ATPase activity, allowing
intracellular sodium accumulation and potassium loss. Water follows sodium
into cells, producing hydropic swelling. This represents a potentially
reversible stage of cellular injury if oxygen delivery and ATP production are
restored promptly.
Q6. A 58-year-old client undergoes coronary reperfusion following a
prolonged myocardial infarction. Despite restoration of blood flow,
additional myocardial injury develops. Which mechanism most
directly contributes to ischemia-reperfusion injury?
A) Complete suppression of intracellular calcium entry
B) Permanent inhibition of inflammatory cell recruitment
C) Reactive oxygen species generation, calcium overload, and mitochondrial
permeability transition
D) Immediate elimination of damaged cellular components
Correct Answer: C) Reactive oxygen species generation, calcium overload,
and mitochondrial permeability transition
Rationale: Reperfusion restores oxygen delivery but may trigger bursts of
reactive oxygen species, inflammatory activation, and intracellular calcium
accumulation. Opening of mitochondrial permeability transition pores can
disrupt energy production and promote cell death. The severity of
reperfusion injury depends on the duration of ischemia and the extent of
prior cellular damage.
