NURSING PATHOPHYSIOLOGY EXAM 1 STUDY GUIDE
2026 | COMPLETE REVIEW | 250 MCQS WITH CORRECT
ANSWERS AND DETAILED RATIONALES| GRADED A+|
LATEST UPDATE
SECTION 1: CELLULAR ADAPTATION, INJURY, AND DEATH (Questions 1–38)
Q1. Which cellular adaptation is characterized by a decrease in cell size and
function due to decreased workload, loss of innervation, or diminished blood
supply?
A. Hypertrophy
B. Hyperplasia
C. Atrophy
Correct Answer: C. Atrophy
Rationale: Atrophy is the reduction in cell size after normal maturity has been
reached, resulting from decreased functional demand, loss of trophic signals,
inadequate nutrition, or diminished blood supply. Hypertrophy increases cell size,
hyperplasia increases cell number, and metaplasia replaces one mature cell type
with another.
Q2. During severe hypoxia, which mechanism is primarily responsible for
irreversible cell death?
A. Accumulation of misfolded proteins
B. Depletion of ATP leading to failure of the sodium-potassium pump
C. Activation of apoptotic pathways by p53
D. Excessive autophagy
Correct Answer: B. Depletion of ATP leading to failure of the sodium-potassium
pump
Rationale: Severe hypoxia halts oxidative phosphorylation, causing critical ATP
depletion. Without ATP, the Na+/K+-ATPase pump fails, leading to sodium and
water influx (cellular swelling), potassium efflux, calcium influx, membrane
1
,damage, and eventual necrosis. While apoptosis and protein misfolding
contribute to other forms of injury, energy failure is the immediate driver of
hypoxic cell death.
Q3. A 68-year-old patient with a 40-year smoking history undergoes bronchial
biopsy showing replacement of normal ciliated columnar epithelium by stratified
squamous epithelium. Which adaptation does this represent?
A. Atrophy
B. Metaplasia
C. Dysplasia
D. Hyperplasia
Correct Answer: B. Metaplasia
Rationale: Metaplasia is the reversible replacement of one mature cell type by
another better able to withstand chronic irritation. In smokers, fragile ciliated
columnar epithelium is replaced by more robust stratified squamous epithelium.
If the irritant persists, metaplasia can progress to dysplasia and malignancy.
Q4. A 55-year-old man with peripheral artery disease develops a dark, dry,
demarcated ulcer on his great toe with elevated serum lactate. Which
pathophysiologic process explains these findings?
A. Reversible cellular injury from temporary ischemia
B. Irreversible coagulative necrosis following prolonged ischemia
C. Liquefactive necrosis due to bacterial superinfection
D. Apoptotic cell death triggered by DNA damage
Correct Answer: B. Irreversible coagulative necrosis following prolonged ischemia
Rationale: This presentation is dry gangrene, a form of coagulative necrosis from
prolonged ischemia. The sequence involves hypoxia, decreased oxidative
phosphorylation, ATP depletion, Na+/K+ pump failure, cellular swelling, calcium
influx, activation of phospholipases and proteases, and irreversible membrane
damage. Coagulative necrosis preserves tissue architecture as ghost outlines.
2
,Liquefactive necrosis would appear soft and liquefied, typical of bacterial
infection.
Q5. Which type of cellular adaptation involves an increase in the number of cells
in an organ or tissue?
A. Hypertrophy
B. Hyperplasia
C. Atrophy
D. Metaplasia
Correct Answer: B. Hyperplasia
Rationale: Hyperplasia is an increase in the number of cells resulting from
increased mitotic activity, often in response to hormonal stimulation or chronic
irritation. Hypertrophy increases cell size, atrophy decreases cell size, and
metaplasia involves cell type replacement.
Q6. A patient with chronic obstructive pulmonary disease (COPD) has long-term
hypoxemia. Which cellular adaptation is most likely in skeletal muscle?
A. Hypertrophy due to increased IGF-1 signaling
B. Atrophy due to decreased oxygen delivery and increased protein degradation
C. Hyperplasia due to compensatory mitotic stimulation
D. Metaplasia due to chronic inflammatory signaling
Correct Answer: B. Atrophy due to decreased oxygen delivery and increased
protein degradation
Rationale: Chronic hypoxemia in COPD leads to reduced ATP production,
increased anaerobic metabolism, and activation of ubiquitin-proteasome
pathways that degrade muscle protein. This results in muscle atrophy,
contributing to sarcopenia and exercise intolerance in COPD patients.
Q7. Which form of cell death is energy-dependent, programmed, and
characterized by cell shrinkage without inflammation?
3
, A. Coagulative necrosis
B. Liquefactive necrosis
C. Apoptosis
D. Fat necrosis
Correct Answer: C. Apoptosis
Rationale: Apoptosis is an active, energy-requiring form of programmed cell death
characterized by cell shrinkage, chromatin condensation, DNA fragmentation, and
formation of apoptotic bodies that are phagocytosed without inflammation.
Necrosis is passive, energy-independent, and typically triggers inflammation.
Q8. A 72-year-old patient dies 10 days after a myocardial infarction. Autopsy
reveals a softened, liquefied area in the myocardium. Which type of necrosis is
present?
A. Coagulative necrosis
B. Liquefactive necrosis
C. Caseous necrosis
D. Fat necrosis
Correct Answer: B. Liquefactive necrosis
Rationale: Although myocardial infarction typically produces coagulative necrosis
initially, enzymatic digestion by recruited leukocytes can lead to liquefactive
necrosis over time, especially if bacterial infection is present. Liquefactive necrosis
is characterized by complete digestion of dead cells, producing a soft, liquefied
center.
Q9. Which intracellular accumulation results from defective metabolism of lipids
and is commonly seen in fatty liver?
A. Glycogen
B. Hemosiderin
C. Triglycerides
D. Lipofuscin
4
2026 | COMPLETE REVIEW | 250 MCQS WITH CORRECT
ANSWERS AND DETAILED RATIONALES| GRADED A+|
LATEST UPDATE
SECTION 1: CELLULAR ADAPTATION, INJURY, AND DEATH (Questions 1–38)
Q1. Which cellular adaptation is characterized by a decrease in cell size and
function due to decreased workload, loss of innervation, or diminished blood
supply?
A. Hypertrophy
B. Hyperplasia
C. Atrophy
Correct Answer: C. Atrophy
Rationale: Atrophy is the reduction in cell size after normal maturity has been
reached, resulting from decreased functional demand, loss of trophic signals,
inadequate nutrition, or diminished blood supply. Hypertrophy increases cell size,
hyperplasia increases cell number, and metaplasia replaces one mature cell type
with another.
Q2. During severe hypoxia, which mechanism is primarily responsible for
irreversible cell death?
A. Accumulation of misfolded proteins
B. Depletion of ATP leading to failure of the sodium-potassium pump
C. Activation of apoptotic pathways by p53
D. Excessive autophagy
Correct Answer: B. Depletion of ATP leading to failure of the sodium-potassium
pump
Rationale: Severe hypoxia halts oxidative phosphorylation, causing critical ATP
depletion. Without ATP, the Na+/K+-ATPase pump fails, leading to sodium and
water influx (cellular swelling), potassium efflux, calcium influx, membrane
1
,damage, and eventual necrosis. While apoptosis and protein misfolding
contribute to other forms of injury, energy failure is the immediate driver of
hypoxic cell death.
Q3. A 68-year-old patient with a 40-year smoking history undergoes bronchial
biopsy showing replacement of normal ciliated columnar epithelium by stratified
squamous epithelium. Which adaptation does this represent?
A. Atrophy
B. Metaplasia
C. Dysplasia
D. Hyperplasia
Correct Answer: B. Metaplasia
Rationale: Metaplasia is the reversible replacement of one mature cell type by
another better able to withstand chronic irritation. In smokers, fragile ciliated
columnar epithelium is replaced by more robust stratified squamous epithelium.
If the irritant persists, metaplasia can progress to dysplasia and malignancy.
Q4. A 55-year-old man with peripheral artery disease develops a dark, dry,
demarcated ulcer on his great toe with elevated serum lactate. Which
pathophysiologic process explains these findings?
A. Reversible cellular injury from temporary ischemia
B. Irreversible coagulative necrosis following prolonged ischemia
C. Liquefactive necrosis due to bacterial superinfection
D. Apoptotic cell death triggered by DNA damage
Correct Answer: B. Irreversible coagulative necrosis following prolonged ischemia
Rationale: This presentation is dry gangrene, a form of coagulative necrosis from
prolonged ischemia. The sequence involves hypoxia, decreased oxidative
phosphorylation, ATP depletion, Na+/K+ pump failure, cellular swelling, calcium
influx, activation of phospholipases and proteases, and irreversible membrane
damage. Coagulative necrosis preserves tissue architecture as ghost outlines.
2
,Liquefactive necrosis would appear soft and liquefied, typical of bacterial
infection.
Q5. Which type of cellular adaptation involves an increase in the number of cells
in an organ or tissue?
A. Hypertrophy
B. Hyperplasia
C. Atrophy
D. Metaplasia
Correct Answer: B. Hyperplasia
Rationale: Hyperplasia is an increase in the number of cells resulting from
increased mitotic activity, often in response to hormonal stimulation or chronic
irritation. Hypertrophy increases cell size, atrophy decreases cell size, and
metaplasia involves cell type replacement.
Q6. A patient with chronic obstructive pulmonary disease (COPD) has long-term
hypoxemia. Which cellular adaptation is most likely in skeletal muscle?
A. Hypertrophy due to increased IGF-1 signaling
B. Atrophy due to decreased oxygen delivery and increased protein degradation
C. Hyperplasia due to compensatory mitotic stimulation
D. Metaplasia due to chronic inflammatory signaling
Correct Answer: B. Atrophy due to decreased oxygen delivery and increased
protein degradation
Rationale: Chronic hypoxemia in COPD leads to reduced ATP production,
increased anaerobic metabolism, and activation of ubiquitin-proteasome
pathways that degrade muscle protein. This results in muscle atrophy,
contributing to sarcopenia and exercise intolerance in COPD patients.
Q7. Which form of cell death is energy-dependent, programmed, and
characterized by cell shrinkage without inflammation?
3
, A. Coagulative necrosis
B. Liquefactive necrosis
C. Apoptosis
D. Fat necrosis
Correct Answer: C. Apoptosis
Rationale: Apoptosis is an active, energy-requiring form of programmed cell death
characterized by cell shrinkage, chromatin condensation, DNA fragmentation, and
formation of apoptotic bodies that are phagocytosed without inflammation.
Necrosis is passive, energy-independent, and typically triggers inflammation.
Q8. A 72-year-old patient dies 10 days after a myocardial infarction. Autopsy
reveals a softened, liquefied area in the myocardium. Which type of necrosis is
present?
A. Coagulative necrosis
B. Liquefactive necrosis
C. Caseous necrosis
D. Fat necrosis
Correct Answer: B. Liquefactive necrosis
Rationale: Although myocardial infarction typically produces coagulative necrosis
initially, enzymatic digestion by recruited leukocytes can lead to liquefactive
necrosis over time, especially if bacterial infection is present. Liquefactive necrosis
is characterized by complete digestion of dead cells, producing a soft, liquefied
center.
Q9. Which intracellular accumulation results from defective metabolism of lipids
and is commonly seen in fatty liver?
A. Glycogen
B. Hemosiderin
C. Triglycerides
D. Lipofuscin
4
