Understanding Pathophysiology
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 6-year-old child is evaluated for recurrent bacterial
respiratory infections and delayed separation of the umbilical
cord after birth. Laboratory analysis demonstrates markedly
impaired neutrophil migration into infected tissues despite
normal neutrophil counts. Defective expression of integrins on
leukocyte surfaces is identified. The impaired host defense
most directly results from failure of which cellular process?
A. Cytoplasmic lysosomal enzyme activation
B. Cell-to-cell adhesion during transmigration
C. Mitochondrial oxidative phosphorylation
,D. Nuclear DNA proofreading during replication
E. Smooth endoplasmic reticulum detoxification
Correct Answer: B
Rationale:
Clinical Clue:
Recurrent bacterial infections with impaired neutrophil tissue
migration suggests defective leukocyte adhesion.
Mechanism:
Integrins mediate adhesion between leukocytes and
endothelial cells during diapedesis.
Why the Correct Answer Is Right:
Without functional integrins, neutrophils cannot firmly adhere
to vascular endothelium or migrate into tissues, severely
impairing inflammatory responses.
Why the Other Options Are Wrong:
A. Lysosomal activation occurs after phagocytosis and is not the
primary defect.
C. Oxidative phosphorylation defects cause energy failure
rather than impaired adhesion.
D. DNA proofreading defects predispose to mutations, not
defective leukocyte migration.
E. SER detoxification is unrelated to leukocyte extravasation.
Exam Trap (common misconception tested):
Confusing neutrophil quantity with neutrophil functional
capacity.
,High-Yield Clinical Correlation:
Cell adhesion molecules are essential for immune surveillance,
wound healing, and inflammatory trafficking.
Q2. A patient with prolonged fasting develops fatigue and mild
confusion. Hepatocytes demonstrate depletion of ATP and
increased reliance on anaerobic glycolysis. Which intracellular
change most directly contributes to impaired ATP production
during nutrient deprivation?
A. Reduced ribosomal RNA synthesis
B. Failure of lysosomal membrane integrity
C. Decreased mitochondrial electron transport activity
D. Enhanced Golgi protein packaging
E. Increased microtubule polymerization
Correct Answer: C
Rationale:
Clinical Clue:
ATP depletion during fasting implicates impaired mitochondrial
energy generation.
Mechanism:
Mitochondria produce ATP through oxidative phosphorylation
using the electron transport chain.
Why the Correct Answer Is Right:
Reduced substrate availability decreases electron transport
, activity and ATP generation, forcing cells toward anaerobic
metabolism.
Why the Other Options Are Wrong:
A. Reduced rRNA synthesis affects protein synthesis but not
primary ATP production.
B. Lysosomal rupture causes enzymatic injury rather than
fasting-related ATP depletion.
D. Golgi packaging is not the major ATP-generating process.
E. Microtubule changes do not explain metabolic ATP failure.
Exam Trap (common misconception tested):
Assuming glycolysis alone adequately sustains high-energy
tissues during starvation.
High-Yield Clinical Correlation:
Mitochondrial dysfunction contributes to ischemic injury,
neurodegeneration, and metabolic disease.
Q3. A researcher exposes cultured cells to a toxin that
selectively disrupts rough endoplasmic reticulum function.
Which consequence is most likely to occur first?
A. Impaired phospholipid degradation
B. Failure of intracellular calcium storage
C. Reduced synthesis of secreted proteins
D. Loss of ATP-dependent ion pumping
E. Defective spindle formation during mitosis
Correct Answer: C
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 6-year-old child is evaluated for recurrent bacterial
respiratory infections and delayed separation of the umbilical
cord after birth. Laboratory analysis demonstrates markedly
impaired neutrophil migration into infected tissues despite
normal neutrophil counts. Defective expression of integrins on
leukocyte surfaces is identified. The impaired host defense
most directly results from failure of which cellular process?
A. Cytoplasmic lysosomal enzyme activation
B. Cell-to-cell adhesion during transmigration
C. Mitochondrial oxidative phosphorylation
,D. Nuclear DNA proofreading during replication
E. Smooth endoplasmic reticulum detoxification
Correct Answer: B
Rationale:
Clinical Clue:
Recurrent bacterial infections with impaired neutrophil tissue
migration suggests defective leukocyte adhesion.
Mechanism:
Integrins mediate adhesion between leukocytes and
endothelial cells during diapedesis.
Why the Correct Answer Is Right:
Without functional integrins, neutrophils cannot firmly adhere
to vascular endothelium or migrate into tissues, severely
impairing inflammatory responses.
Why the Other Options Are Wrong:
A. Lysosomal activation occurs after phagocytosis and is not the
primary defect.
C. Oxidative phosphorylation defects cause energy failure
rather than impaired adhesion.
D. DNA proofreading defects predispose to mutations, not
defective leukocyte migration.
E. SER detoxification is unrelated to leukocyte extravasation.
Exam Trap (common misconception tested):
Confusing neutrophil quantity with neutrophil functional
capacity.
,High-Yield Clinical Correlation:
Cell adhesion molecules are essential for immune surveillance,
wound healing, and inflammatory trafficking.
Q2. A patient with prolonged fasting develops fatigue and mild
confusion. Hepatocytes demonstrate depletion of ATP and
increased reliance on anaerobic glycolysis. Which intracellular
change most directly contributes to impaired ATP production
during nutrient deprivation?
A. Reduced ribosomal RNA synthesis
B. Failure of lysosomal membrane integrity
C. Decreased mitochondrial electron transport activity
D. Enhanced Golgi protein packaging
E. Increased microtubule polymerization
Correct Answer: C
Rationale:
Clinical Clue:
ATP depletion during fasting implicates impaired mitochondrial
energy generation.
Mechanism:
Mitochondria produce ATP through oxidative phosphorylation
using the electron transport chain.
Why the Correct Answer Is Right:
Reduced substrate availability decreases electron transport
, activity and ATP generation, forcing cells toward anaerobic
metabolism.
Why the Other Options Are Wrong:
A. Reduced rRNA synthesis affects protein synthesis but not
primary ATP production.
B. Lysosomal rupture causes enzymatic injury rather than
fasting-related ATP depletion.
D. Golgi packaging is not the major ATP-generating process.
E. Microtubule changes do not explain metabolic ATP failure.
Exam Trap (common misconception tested):
Assuming glycolysis alone adequately sustains high-energy
tissues during starvation.
High-Yield Clinical Correlation:
Mitochondrial dysfunction contributes to ischemic injury,
neurodegeneration, and metabolic disease.
Q3. A researcher exposes cultured cells to a toxin that
selectively disrupts rough endoplasmic reticulum function.
Which consequence is most likely to occur first?
A. Impaired phospholipid degradation
B. Failure of intracellular calcium storage
C. Reduced synthesis of secreted proteins
D. Loss of ATP-dependent ion pumping
E. Defective spindle formation during mitosis
Correct Answer: C
