Understanding Pathophysiology
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 6-year-old boy develops recurrent bacterial pneumonias
and chronic otitis media. Neutrophils obtained during
evaluation demonstrate defective migration toward
inflammatory chemotactic signals despite normal phagocytic
capacity once organisms are encountered. Dysfunction of which
cellular structure most directly explains this patient’s
presentation?
A. Intermediate filaments
B. Microtubules
C. Lysosomal acid hydrolases
D. Tight junction proteins
E. Rough endoplasmic reticulum
,Correct Answer: B
Rationale:
Clinical Clue:
Recurrent infections with impaired leukocyte chemotaxis
indicate defective cytoskeletal-mediated cellular movement.
Mechanism:
Microtubules coordinate intracellular transport and directional
cell motility through dynamic polymerization and
depolymerization.
Why the Correct Answer Is Right:
Neutrophil migration depends heavily on microtubule
organization for chemotaxis and directed movement toward
inflammatory mediators.
Why the Other Options Are Wrong:
A. Intermediate filaments primarily provide tensile structural
stability.
C. Lysosomal enzymes affect intracellular degradation, not
migration.
D. Tight junctions regulate epithelial permeability.
E. Rough ER synthesizes membrane and secreted proteins.
Exam Trap (common misconception tested):
Confusing all cytoskeletal components as functionally
equivalent.
,High-Yield Clinical Correlation:
Microtubule dysfunction also impairs ciliary movement and
intracellular vesicle trafficking.
Q2. During septic shock, hepatocytes demonstrate decreased
ATP production despite adequate intracellular glucose stores.
The metabolic abnormality most directly responsible for
impaired cellular energy generation is failure of:
A. Ribosomal protein synthesis
B. Oxidative phosphorylation
C. Glycogenolysis
D. Peroxisomal lipid metabolism
E. Nuclear transcription
Correct Answer: B
Rationale:
Clinical Clue:
ATP depletion during shock commonly reflects mitochondrial
dysfunction despite substrate availability.
Mechanism:
Oxidative phosphorylation within mitochondria generates the
majority of cellular ATP via the electron transport chain.
Why the Correct Answer Is Right:
Sepsis-induced mitochondrial injury disrupts electron transport,
impairing ATP synthesis even when glucose is available.
, Why the Other Options Are Wrong:
A. Reduced protein synthesis does not immediately explain ATP
failure.
C. Glycogenolysis supplies substrate but not ATP generation
itself.
D. Peroxisomal metabolism contributes minimally to ATP
production.
E. Nuclear transcription is not the primary ATP-producing
process.
Exam Trap (common misconception tested):
Assuming glucose availability guarantees adequate ATP
production.
High-Yield Clinical Correlation:
Mitochondrial dysfunction contributes to multiorgan failure
during severe systemic inflammation.
Q3. A patient with extensive thermal burns develops rapid fluid
loss from the intravascular compartment into interstitial
tissues. Disruption of which intercellular structure most directly
accounts for the increased epithelial permeability?
A. Desmosomes
B. Gap junctions
C. Tight junctions
D. Hemidesmosomes
E. Integrins
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 6-year-old boy develops recurrent bacterial pneumonias
and chronic otitis media. Neutrophils obtained during
evaluation demonstrate defective migration toward
inflammatory chemotactic signals despite normal phagocytic
capacity once organisms are encountered. Dysfunction of which
cellular structure most directly explains this patient’s
presentation?
A. Intermediate filaments
B. Microtubules
C. Lysosomal acid hydrolases
D. Tight junction proteins
E. Rough endoplasmic reticulum
,Correct Answer: B
Rationale:
Clinical Clue:
Recurrent infections with impaired leukocyte chemotaxis
indicate defective cytoskeletal-mediated cellular movement.
Mechanism:
Microtubules coordinate intracellular transport and directional
cell motility through dynamic polymerization and
depolymerization.
Why the Correct Answer Is Right:
Neutrophil migration depends heavily on microtubule
organization for chemotaxis and directed movement toward
inflammatory mediators.
Why the Other Options Are Wrong:
A. Intermediate filaments primarily provide tensile structural
stability.
C. Lysosomal enzymes affect intracellular degradation, not
migration.
D. Tight junctions regulate epithelial permeability.
E. Rough ER synthesizes membrane and secreted proteins.
Exam Trap (common misconception tested):
Confusing all cytoskeletal components as functionally
equivalent.
,High-Yield Clinical Correlation:
Microtubule dysfunction also impairs ciliary movement and
intracellular vesicle trafficking.
Q2. During septic shock, hepatocytes demonstrate decreased
ATP production despite adequate intracellular glucose stores.
The metabolic abnormality most directly responsible for
impaired cellular energy generation is failure of:
A. Ribosomal protein synthesis
B. Oxidative phosphorylation
C. Glycogenolysis
D. Peroxisomal lipid metabolism
E. Nuclear transcription
Correct Answer: B
Rationale:
Clinical Clue:
ATP depletion during shock commonly reflects mitochondrial
dysfunction despite substrate availability.
Mechanism:
Oxidative phosphorylation within mitochondria generates the
majority of cellular ATP via the electron transport chain.
Why the Correct Answer Is Right:
Sepsis-induced mitochondrial injury disrupts electron transport,
impairing ATP synthesis even when glucose is available.
, Why the Other Options Are Wrong:
A. Reduced protein synthesis does not immediately explain ATP
failure.
C. Glycogenolysis supplies substrate but not ATP generation
itself.
D. Peroxisomal metabolism contributes minimally to ATP
production.
E. Nuclear transcription is not the primary ATP-producing
process.
Exam Trap (common misconception tested):
Assuming glucose availability guarantees adequate ATP
production.
High-Yield Clinical Correlation:
Mitochondrial dysfunction contributes to multiorgan failure
during severe systemic inflammation.
Q3. A patient with extensive thermal burns develops rapid fluid
loss from the intravascular compartment into interstitial
tissues. Disruption of which intercellular structure most directly
accounts for the increased epithelial permeability?
A. Desmosomes
B. Gap junctions
C. Tight junctions
D. Hemidesmosomes
E. Integrins
