Understanding Pathophysiology
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 6-year-old child presents with recurrent bacterial
infections, delayed wound healing, and poor leukocyte
migration into infected tissue despite marked neutrophilia on
laboratory testing. Genetic analysis reveals defective integrin
activation on neutrophils. The impaired host defense is most
directly related to failure of which cellular process?
A. Intracellular lysosomal acidification
B. Cell-to-cell adhesion between leukocytes and endothelium
C. Oxidative phosphorylation within neutrophils
D. DNA replication during granulocyte maturation
E. Golgi-mediated protein glycosylation
,Correct Answer: B
Rationale:
Clinical Clue:
Recurrent infections with impaired neutrophil tissue migration
despite elevated circulating neutrophils indicates 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 activation prevents stable leukocyte-
endothelial adhesion, impairing extravasation into infected
tissue.
Why the Other Options Are Wrong:
A. Lysosomal acidification defects impair intracellular killing,
not adhesion.
C. Oxidative phosphorylation is less critical because neutrophils
rely heavily on glycolysis.
D. DNA replication defects would reduce leukocyte production.
E. Glycosylation abnormalities may affect many proteins but do
not specifically explain adhesion failure.
Exam Trap (common misconception tested):
Confusing neutrophil functional defects with neutropenia.
,High-Yield Clinical Correlation:
Leukocyte adhesion defects characteristically produce delayed
umbilical cord separation and absent pus formation.
Q2. A researcher exposes hepatocytes to cyanide, resulting in
abrupt cessation of aerobic ATP production. Within minutes,
cells demonstrate swelling and membrane blebbing. The
earliest intracellular event most directly responsible for this
change is:
A. Activation of caspase-mediated apoptosis
B. Increased intracellular sodium concentration
C. Nuclear chromatin fragmentation
D. Release of lysosomal hydrolases
E. Accumulation of intracellular calcium phosphate crystals
Correct Answer: B
Rationale:
Clinical Clue:
Acute ATP depletion causing rapid cellular swelling indicates
failure of energy-dependent ion transport.
Mechanism:
ATP depletion disables Na+/K+-ATPase activity, leading to
sodium and water influx.
, Why the Correct Answer Is Right:
Loss of membrane ion pump function causes intracellular
sodium accumulation and osmotic swelling.
Why the Other Options Are Wrong:
A. Caspase activation is associated with apoptosis, not
immediate swelling.
C. Chromatin fragmentation occurs later in irreversible injury.
D. Lysosomal rupture is a later event in necrosis.
E. Calcium precipitation is not the earliest manifestation.
Exam Trap (common misconception tested):
Assuming all cell death pathways begin with nuclear changes
rather than membrane transport failure.
High-Yield Clinical Correlation:
Cellular swelling is a hallmark of reversible hypoxic injury.
Q3. A patient with metastatic carcinoma develops severe
cachexia despite adequate caloric intake. Tumor analysis
demonstrates constitutive activation of growth factor receptors
linked to intracellular kinase cascades. Persistent activation of
these signaling pathways most directly promotes which cellular
effect?
A. Reduced transcriptional activity
B. Increased apoptotic sensitivity
C. Autonomous cellular proliferation
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 6-year-old child presents with recurrent bacterial
infections, delayed wound healing, and poor leukocyte
migration into infected tissue despite marked neutrophilia on
laboratory testing. Genetic analysis reveals defective integrin
activation on neutrophils. The impaired host defense is most
directly related to failure of which cellular process?
A. Intracellular lysosomal acidification
B. Cell-to-cell adhesion between leukocytes and endothelium
C. Oxidative phosphorylation within neutrophils
D. DNA replication during granulocyte maturation
E. Golgi-mediated protein glycosylation
,Correct Answer: B
Rationale:
Clinical Clue:
Recurrent infections with impaired neutrophil tissue migration
despite elevated circulating neutrophils indicates 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 activation prevents stable leukocyte-
endothelial adhesion, impairing extravasation into infected
tissue.
Why the Other Options Are Wrong:
A. Lysosomal acidification defects impair intracellular killing,
not adhesion.
C. Oxidative phosphorylation is less critical because neutrophils
rely heavily on glycolysis.
D. DNA replication defects would reduce leukocyte production.
E. Glycosylation abnormalities may affect many proteins but do
not specifically explain adhesion failure.
Exam Trap (common misconception tested):
Confusing neutrophil functional defects with neutropenia.
,High-Yield Clinical Correlation:
Leukocyte adhesion defects characteristically produce delayed
umbilical cord separation and absent pus formation.
Q2. A researcher exposes hepatocytes to cyanide, resulting in
abrupt cessation of aerobic ATP production. Within minutes,
cells demonstrate swelling and membrane blebbing. The
earliest intracellular event most directly responsible for this
change is:
A. Activation of caspase-mediated apoptosis
B. Increased intracellular sodium concentration
C. Nuclear chromatin fragmentation
D. Release of lysosomal hydrolases
E. Accumulation of intracellular calcium phosphate crystals
Correct Answer: B
Rationale:
Clinical Clue:
Acute ATP depletion causing rapid cellular swelling indicates
failure of energy-dependent ion transport.
Mechanism:
ATP depletion disables Na+/K+-ATPase activity, leading to
sodium and water influx.
, Why the Correct Answer Is Right:
Loss of membrane ion pump function causes intracellular
sodium accumulation and osmotic swelling.
Why the Other Options Are Wrong:
A. Caspase activation is associated with apoptosis, not
immediate swelling.
C. Chromatin fragmentation occurs later in irreversible injury.
D. Lysosomal rupture is a later event in necrosis.
E. Calcium precipitation is not the earliest manifestation.
Exam Trap (common misconception tested):
Assuming all cell death pathways begin with nuclear changes
rather than membrane transport failure.
High-Yield Clinical Correlation:
Cellular swelling is a hallmark of reversible hypoxic injury.
Q3. A patient with metastatic carcinoma develops severe
cachexia despite adequate caloric intake. Tumor analysis
demonstrates constitutive activation of growth factor receptors
linked to intracellular kinase cascades. Persistent activation of
these signaling pathways most directly promotes which cellular
effect?
A. Reduced transcriptional activity
B. Increased apoptotic sensitivity
C. Autonomous cellular proliferation
