Understanding Pathophysiology
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 6-year-old boy presents with recurrent bacterial
infections, delayed separation of the umbilical cord, and poor
wound healing. Laboratory testing demonstrates marked
neutrophilia but minimal neutrophil accumulation at sites of
tissue injury. A defect involving which cellular process most
directly explains these findings?
A. Microtubule-mediated vesicular transport
B. Integrin-mediated cellular adhesion
C. Lysosomal oxidative phosphorylation
D. Ribosomal peptide assembly
E. Mitochondrial β-oxidation
,Correct Answer: B
Rationale:
Clinical Clue:
Failure of neutrophils to migrate into tissues despite elevated
circulating neutrophils suggests defective leukocyte adhesion.
Mechanism:
Integrins mediate firm adhesion of leukocytes to endothelial
cells before transmigration into tissues.
Why the Correct Answer Is Right:
Defective integrin-mediated adhesion prevents neutrophil
extravasation, causing recurrent infections and impaired wound
healing.
Why the Other Options Are Wrong:
A. Vesicular transport defects impair secretion but do not
specifically block transmigration.
C. Oxidative phosphorylation defects would impair killing
capacity, not tissue migration.
D. Ribosomal dysfunction causes generalized protein synthesis
abnormalities.
E. β-oxidation defects primarily impair energy metabolism in
muscle and liver.
Exam Trap (common misconception tested):
Confusing leukocyte migration defects with defects in
phagocytic killing.
,High-Yield Clinical Correlation:
Leukocyte adhesion deficiencies produce severe bacterial
infections without pus formation because neutrophils cannot
enter tissues.
Q2. A patient with chronic alcohol use develops hepatocellular
swelling after an episode of severe hypotension. Microscopy
demonstrates distended endoplasmic reticulum and
intracellular sodium accumulation. The cellular change is best
explained by failure of which process?
A. Na+/K+-ATPase activity
B. DNA helicase function
C. Golgi protein glycosylation
D. Lysosomal membrane fusion
E. Peroxisomal fatty acid transport
Correct Answer: A
Rationale:
Clinical Clue:
Cell swelling following ischemia strongly suggests ATP
depletion.
Mechanism:
ATP depletion impairs Na+/K+-ATPase pumps, allowing sodium
and water influx into cells.
, Why the Correct Answer Is Right:
Loss of membrane ion transport causes osmotic cellular
swelling during hypoxic injury.
Why the Other Options Are Wrong:
B. DNA helicase dysfunction affects replication, not acute
swelling.
C. Golgi dysfunction impairs protein processing rather than ion
balance.
D. Lysosomal fusion abnormalities produce storage disorders.
E. Peroxisomal transport defects impair lipid metabolism.
Exam Trap (common misconception tested):
Assuming swelling results directly from membrane rupture
rather than pump failure.
High-Yield Clinical Correlation:
Cellular swelling is one of the earliest reversible manifestations
of ischemic injury.
Q3. A researcher exposes cultured cells to a toxin that prevents
phosphorylation of receptor-associated tyrosine residues after
ligand binding. The cells fail to activate downstream
transcription pathways. The toxin most directly disrupts which
cellular function?
A. Intracellular signal transduction
B. Passive membrane diffusion
C. Structural cytoskeletal support
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 6-year-old boy presents with recurrent bacterial
infections, delayed separation of the umbilical cord, and poor
wound healing. Laboratory testing demonstrates marked
neutrophilia but minimal neutrophil accumulation at sites of
tissue injury. A defect involving which cellular process most
directly explains these findings?
A. Microtubule-mediated vesicular transport
B. Integrin-mediated cellular adhesion
C. Lysosomal oxidative phosphorylation
D. Ribosomal peptide assembly
E. Mitochondrial β-oxidation
,Correct Answer: B
Rationale:
Clinical Clue:
Failure of neutrophils to migrate into tissues despite elevated
circulating neutrophils suggests defective leukocyte adhesion.
Mechanism:
Integrins mediate firm adhesion of leukocytes to endothelial
cells before transmigration into tissues.
Why the Correct Answer Is Right:
Defective integrin-mediated adhesion prevents neutrophil
extravasation, causing recurrent infections and impaired wound
healing.
Why the Other Options Are Wrong:
A. Vesicular transport defects impair secretion but do not
specifically block transmigration.
C. Oxidative phosphorylation defects would impair killing
capacity, not tissue migration.
D. Ribosomal dysfunction causes generalized protein synthesis
abnormalities.
E. β-oxidation defects primarily impair energy metabolism in
muscle and liver.
Exam Trap (common misconception tested):
Confusing leukocyte migration defects with defects in
phagocytic killing.
,High-Yield Clinical Correlation:
Leukocyte adhesion deficiencies produce severe bacterial
infections without pus formation because neutrophils cannot
enter tissues.
Q2. A patient with chronic alcohol use develops hepatocellular
swelling after an episode of severe hypotension. Microscopy
demonstrates distended endoplasmic reticulum and
intracellular sodium accumulation. The cellular change is best
explained by failure of which process?
A. Na+/K+-ATPase activity
B. DNA helicase function
C. Golgi protein glycosylation
D. Lysosomal membrane fusion
E. Peroxisomal fatty acid transport
Correct Answer: A
Rationale:
Clinical Clue:
Cell swelling following ischemia strongly suggests ATP
depletion.
Mechanism:
ATP depletion impairs Na+/K+-ATPase pumps, allowing sodium
and water influx into cells.
, Why the Correct Answer Is Right:
Loss of membrane ion transport causes osmotic cellular
swelling during hypoxic injury.
Why the Other Options Are Wrong:
B. DNA helicase dysfunction affects replication, not acute
swelling.
C. Golgi dysfunction impairs protein processing rather than ion
balance.
D. Lysosomal fusion abnormalities produce storage disorders.
E. Peroxisomal transport defects impair lipid metabolism.
Exam Trap (common misconception tested):
Assuming swelling results directly from membrane rupture
rather than pump failure.
High-Yield Clinical Correlation:
Cellular swelling is one of the earliest reversible manifestations
of ischemic injury.
Q3. A researcher exposes cultured cells to a toxin that prevents
phosphorylation of receptor-associated tyrosine residues after
ligand binding. The cells fail to activate downstream
transcription pathways. The toxin most directly disrupts which
cellular function?
A. Intracellular signal transduction
B. Passive membrane diffusion
C. Structural cytoskeletal support
