APPLIED PATHOPHYSIOLOGY CHAPTER 1 EXAM
PREP CHALLENGING CLINICAL AND CASE
BASED MCQS WITH EXPERT RATIONALES
1. A 64-year-old male with severe peripheral artery disease
experiences chronic ischemia to his lower extremities. A
biopsy of the gastrocnemius muscle reveals a significant
decrease in muscle cell size. Which of the following
mechanisms explains this cellular alteration?
A. Ubiquitin-proteasome pathway degradation of cellular
proteins
B. Increased synthesis of intermediate filaments
C. Activation of the mammalian target of rapamycin (mTOR)
pathway
D. Deposition of lipofuscin granules within the
cytolysosomes
CORRECT ANSWER: A
RATiONAlE: Cellular atrophy involves a decrease in cell size
due to a loss of cellular substance. A primary mechanism is the
ubiquitin-proteasome pathway, where proteins are conjugated
to ubiquitin and degraded by proteasomes. Ischemia decreases
nutrient delivery and intracellular ATP, accelerating protein
catabolism.
2. A 32-year-old female presents with a 4-week history of
severe heartburn. An endoscopy with esophageal biopsy
reveals that the normal stratified squamous epithelium of the
distal esophagus has been replaced by simple columnar
, epithelium with goblet cells. This finding is an example of:
A. Dysplasia
B. Hyperplasia
C. Metaplasia
D. Anaplasia
CORRECT ANSWER: C
RATiONAlE: Metaplasia is a reversible change in which
one adult cell type (epithelial or mesenchymal) is replaced
by another adult cell type better able to withstand chronic
irritation or stress (in this case, gastric acid).
3. During an experimental study on myocardial infarction,
cardiomyocytes are subjected to prolonged hypoxic
conditions. Investigators observe a rapid depletion of
intracellular ATP, resulting in the failure of the plasma
membrane Na⁺/K⁺-ATPase pump. What is the immediate
intracellular consequence of this pump failure?
A. Efflux of water, leading to cell shrinkage and crenation
B. Influx of sodium and water, resulting in cellular swelling
C. Efflux of calcium ions into the extracellular space
D. Decreased intracellular osmotic pressure
CORRECT ANSWER: B
RATiONAlE: When the energy-dependent Na⁺/K⁺-
ATPase pump fails due to ATP depletion, sodium
accumulates intracellularly. This increases intracellular
osmotic pressure, drawing water into the cell and causing
acute cellular swelling (hydropic degeneration).
4. A 48-year-old male is admitted with severe acute
pancreatitis. Serum laboratory tests demonstrate markedly
, elevated levels of amylase and lipase. A computed
tomography (CT) scan reveals areas of patchy, chalky-white
lesions within the peripancreatic adipose tissue. Which type
of necrosis is most characteristic of this condition?
A. Coagulative necrosis
B. Liquefactive necrosis
C. Caseous necrosis
D. Fat necrosis
CORRECT ANSWER: D
RATiONAlE: Fat necrosis occurs specifically from the
release of activated pancreatic lipases into the pancreas
and peritoneal cavity. These enzymes break down
triglycerides into fatty acids, which combine with calcium
ions to form chalky-white deposits (saponification).
5. A tissue sample from a healing surgical wound is examined
under a microscope. The pathologist notes an increase in the
absolute number of fibroblasts and endothelial cells, driven
by the local secretion of platelet-derived growth factor
(PDGF) and transforming growth factor-beta (TGF-β). This
increase in cell number is best categorized as:
A. Physiological hypertrophy
B. Compensatory hyperplasia
C. Pathological dysplasia
D. Metaplasia
CORRECT ANSWER: B
RATiONAlE: Hyperplasia is an increase in the number
of cells in an organ or tissue. During wound healing,
compensatory hyperplasia occurs as fibroblasts and
, vascular endothelial cells proliferate to form granulation
tissue under the influence of growth factors.
6. A 55-year-old male with long-standing, untreated
hypertension shows evidence of left ventricular hypertrophy
on an echocardiogram. At the cellular level, this increase in
myocardial mass is primarily driven by:
A. Increased DNA replication and cellular division
B. Accelerated synthesis of cellular proteins and
myofilaments
C. Recruitment of circulating stem cells to the myocardium
D. Intracellular accumulation of glycogen and fluid
CORRECT ANSWER: B
RATiONAlE: Cardiomyocytes are permanent cells and
cannot divide to undergo hyperplasia. Myocardial
hypertrophy is driven by mechanical stretch and
neurohumoral factors that upregulate transcription factors,
increasing protein synthesis and assembling more
myofilaments.
7. A 29-year-old pregnant female undergoes a routine physical
examination. Her uterus has increased in size significantly
compared to her pre-pregnancy state. This physiological
enlargement is due to a combination of which two cellular
processes?
A. Hypertrophy and metaplasia
B. Hyperplasia and dysplasia
C. Hypertrophy and hyperplasia
D. Hyperplasia and neoplasia
CORRECT ANSWER: C
PREP CHALLENGING CLINICAL AND CASE
BASED MCQS WITH EXPERT RATIONALES
1. A 64-year-old male with severe peripheral artery disease
experiences chronic ischemia to his lower extremities. A
biopsy of the gastrocnemius muscle reveals a significant
decrease in muscle cell size. Which of the following
mechanisms explains this cellular alteration?
A. Ubiquitin-proteasome pathway degradation of cellular
proteins
B. Increased synthesis of intermediate filaments
C. Activation of the mammalian target of rapamycin (mTOR)
pathway
D. Deposition of lipofuscin granules within the
cytolysosomes
CORRECT ANSWER: A
RATiONAlE: Cellular atrophy involves a decrease in cell size
due to a loss of cellular substance. A primary mechanism is the
ubiquitin-proteasome pathway, where proteins are conjugated
to ubiquitin and degraded by proteasomes. Ischemia decreases
nutrient delivery and intracellular ATP, accelerating protein
catabolism.
2. A 32-year-old female presents with a 4-week history of
severe heartburn. An endoscopy with esophageal biopsy
reveals that the normal stratified squamous epithelium of the
distal esophagus has been replaced by simple columnar
, epithelium with goblet cells. This finding is an example of:
A. Dysplasia
B. Hyperplasia
C. Metaplasia
D. Anaplasia
CORRECT ANSWER: C
RATiONAlE: Metaplasia is a reversible change in which
one adult cell type (epithelial or mesenchymal) is replaced
by another adult cell type better able to withstand chronic
irritation or stress (in this case, gastric acid).
3. During an experimental study on myocardial infarction,
cardiomyocytes are subjected to prolonged hypoxic
conditions. Investigators observe a rapid depletion of
intracellular ATP, resulting in the failure of the plasma
membrane Na⁺/K⁺-ATPase pump. What is the immediate
intracellular consequence of this pump failure?
A. Efflux of water, leading to cell shrinkage and crenation
B. Influx of sodium and water, resulting in cellular swelling
C. Efflux of calcium ions into the extracellular space
D. Decreased intracellular osmotic pressure
CORRECT ANSWER: B
RATiONAlE: When the energy-dependent Na⁺/K⁺-
ATPase pump fails due to ATP depletion, sodium
accumulates intracellularly. This increases intracellular
osmotic pressure, drawing water into the cell and causing
acute cellular swelling (hydropic degeneration).
4. A 48-year-old male is admitted with severe acute
pancreatitis. Serum laboratory tests demonstrate markedly
, elevated levels of amylase and lipase. A computed
tomography (CT) scan reveals areas of patchy, chalky-white
lesions within the peripancreatic adipose tissue. Which type
of necrosis is most characteristic of this condition?
A. Coagulative necrosis
B. Liquefactive necrosis
C. Caseous necrosis
D. Fat necrosis
CORRECT ANSWER: D
RATiONAlE: Fat necrosis occurs specifically from the
release of activated pancreatic lipases into the pancreas
and peritoneal cavity. These enzymes break down
triglycerides into fatty acids, which combine with calcium
ions to form chalky-white deposits (saponification).
5. A tissue sample from a healing surgical wound is examined
under a microscope. The pathologist notes an increase in the
absolute number of fibroblasts and endothelial cells, driven
by the local secretion of platelet-derived growth factor
(PDGF) and transforming growth factor-beta (TGF-β). This
increase in cell number is best categorized as:
A. Physiological hypertrophy
B. Compensatory hyperplasia
C. Pathological dysplasia
D. Metaplasia
CORRECT ANSWER: B
RATiONAlE: Hyperplasia is an increase in the number
of cells in an organ or tissue. During wound healing,
compensatory hyperplasia occurs as fibroblasts and
, vascular endothelial cells proliferate to form granulation
tissue under the influence of growth factors.
6. A 55-year-old male with long-standing, untreated
hypertension shows evidence of left ventricular hypertrophy
on an echocardiogram. At the cellular level, this increase in
myocardial mass is primarily driven by:
A. Increased DNA replication and cellular division
B. Accelerated synthesis of cellular proteins and
myofilaments
C. Recruitment of circulating stem cells to the myocardium
D. Intracellular accumulation of glycogen and fluid
CORRECT ANSWER: B
RATiONAlE: Cardiomyocytes are permanent cells and
cannot divide to undergo hyperplasia. Myocardial
hypertrophy is driven by mechanical stretch and
neurohumoral factors that upregulate transcription factors,
increasing protein synthesis and assembling more
myofilaments.
7. A 29-year-old pregnant female undergoes a routine physical
examination. Her uterus has increased in size significantly
compared to her pre-pregnancy state. This physiological
enlargement is due to a combination of which two cellular
processes?
A. Hypertrophy and metaplasia
B. Hyperplasia and dysplasia
C. Hypertrophy and hyperplasia
D. Hyperplasia and neoplasia
CORRECT ANSWER: C
