Understanding Pathophysiology
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 7-year-old child develops recurrent bacterial respiratory
infections and chronic sinusitis. Genetic testing reveals
defective dynein arms within cilia lining the respiratory
epithelium. The impaired mucociliary clearance is most
directly attributable to dysfunction of which cellular
structure?
A. Intermediate filaments
B. Microtubules
C. Microfilaments
D. Desmosomes
E. Gap junctions
Correct Answer: B
,Rationale:
Clinical Clue: Recurrent respiratory infections with ciliary
dysfunction.
Mechanism: Cilia depend on microtubules arranged in a 9+2
structure and powered by dynein motor proteins.
Why the Correct Answer Is Right: Microtubules form the
structural framework of motile cilia and facilitate coordinated
movement required for mucus transport.
Why the Other Options Are Wrong:
• A: Intermediate filaments provide structural stability.
• C: Microfilaments participate primarily in cell motility and
contraction.
• D: Desmosomes provide mechanical adhesion between
cells.
• E: Gap junctions allow intercellular communication.
Exam Trap (common misconception tested): Confusing
cytoskeletal components involved in intracellular movement
versus cellular support.
High-Yield Clinical Correlation: Primary ciliary dyskinesia results
from defective ciliary microtubule function and recurrent
respiratory infections.
,Q2. During wound healing, fibroblasts migrate into damaged
tissue. The ability of these cells to extend pseudopods and
move through extracellular matrix is primarily dependent
upon dynamic remodeling of which intracellular component?
A. Lysosomes
B. Rough endoplasmic reticulum
C. Microfilaments
D. Centrioles
E. Golgi apparatus
Correct Answer: C
Rationale:
Clinical Clue: Cell migration during tissue repair.
Mechanism: Actin microfilaments polymerize and depolymerize
to generate cell movement.
Why the Correct Answer Is Right: Actin filaments drive
pseudopod formation and directional migration.
Why the Other Options Are Wrong:
• A: Lysosomes digest intracellular materials.
• B: Rough ER synthesizes proteins.
• D: Centrioles organize mitotic spindles.
• E: Golgi modifies and packages proteins.
Exam Trap: Assuming organelles involved in protein synthesis
mediate movement.
, High-Yield Clinical Correlation: Cell migration underlies
embryogenesis, immune responses, and wound healing.
Q3. A patient with a hereditary mutation affecting desmoglein
experiences separation of epithelial cells under mechanical
stress. Which pathophysiologic consequence is most likely?
A. Impaired ATP production
B. Loss of intracellular protein trafficking
C. Reduced electrical signaling between cells
D. Decreased structural cohesion between adjacent cells
E. Failure of DNA replication
Correct Answer: D
Rationale:
Clinical Clue: Defective desmoglein proteins.
Mechanism: Desmogleins are critical components of
desmosomes.
Why the Correct Answer Is Right: Desmosomes provide strong
mechanical attachment between neighboring cells.
Why the Other Options Are Wrong:
• A: ATP production occurs in mitochondria.
• B: Protein trafficking involves ER/Golgi systems.
• C: Gap junctions mediate electrical communication.
• E: DNA replication occurs in the nucleus.
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 7-year-old child develops recurrent bacterial respiratory
infections and chronic sinusitis. Genetic testing reveals
defective dynein arms within cilia lining the respiratory
epithelium. The impaired mucociliary clearance is most
directly attributable to dysfunction of which cellular
structure?
A. Intermediate filaments
B. Microtubules
C. Microfilaments
D. Desmosomes
E. Gap junctions
Correct Answer: B
,Rationale:
Clinical Clue: Recurrent respiratory infections with ciliary
dysfunction.
Mechanism: Cilia depend on microtubules arranged in a 9+2
structure and powered by dynein motor proteins.
Why the Correct Answer Is Right: Microtubules form the
structural framework of motile cilia and facilitate coordinated
movement required for mucus transport.
Why the Other Options Are Wrong:
• A: Intermediate filaments provide structural stability.
• C: Microfilaments participate primarily in cell motility and
contraction.
• D: Desmosomes provide mechanical adhesion between
cells.
• E: Gap junctions allow intercellular communication.
Exam Trap (common misconception tested): Confusing
cytoskeletal components involved in intracellular movement
versus cellular support.
High-Yield Clinical Correlation: Primary ciliary dyskinesia results
from defective ciliary microtubule function and recurrent
respiratory infections.
,Q2. During wound healing, fibroblasts migrate into damaged
tissue. The ability of these cells to extend pseudopods and
move through extracellular matrix is primarily dependent
upon dynamic remodeling of which intracellular component?
A. Lysosomes
B. Rough endoplasmic reticulum
C. Microfilaments
D. Centrioles
E. Golgi apparatus
Correct Answer: C
Rationale:
Clinical Clue: Cell migration during tissue repair.
Mechanism: Actin microfilaments polymerize and depolymerize
to generate cell movement.
Why the Correct Answer Is Right: Actin filaments drive
pseudopod formation and directional migration.
Why the Other Options Are Wrong:
• A: Lysosomes digest intracellular materials.
• B: Rough ER synthesizes proteins.
• D: Centrioles organize mitotic spindles.
• E: Golgi modifies and packages proteins.
Exam Trap: Assuming organelles involved in protein synthesis
mediate movement.
, High-Yield Clinical Correlation: Cell migration underlies
embryogenesis, immune responses, and wound healing.
Q3. A patient with a hereditary mutation affecting desmoglein
experiences separation of epithelial cells under mechanical
stress. Which pathophysiologic consequence is most likely?
A. Impaired ATP production
B. Loss of intracellular protein trafficking
C. Reduced electrical signaling between cells
D. Decreased structural cohesion between adjacent cells
E. Failure of DNA replication
Correct Answer: D
Rationale:
Clinical Clue: Defective desmoglein proteins.
Mechanism: Desmogleins are critical components of
desmosomes.
Why the Correct Answer Is Right: Desmosomes provide strong
mechanical attachment between neighboring cells.
Why the Other Options Are Wrong:
• A: ATP production occurs in mitochondria.
• B: Protein trafficking involves ER/Golgi systems.
• C: Gap junctions mediate electrical communication.
• E: DNA replication occurs in the nucleus.
