Understanding Pathophysiology
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 6-year-old boy develops recurrent bacterial infections
and delayed wound healing. Genetic analysis identifies a
mutation affecting integrin-mediated anchoring between
leukocytes and vascular endothelium. The impaired process
most directly disrupts which cellular function?
A. Oxidative phosphorylation within mitochondria
B. Intercellular adhesion and signal-mediated migration
C. Ribosomal assembly of structural proteins
D. Endoplasmic reticulum calcium storage
E. Lysosomal degradation of phagocytosed material
Correct Answer: B
Rationale:
,Clinical Clue:
Recurrent infections with impaired leukocyte trafficking suggest
defective adhesion-dependent migration.
Mechanism:
Integrins mediate cell-to-cell and cell-to-matrix adhesion
essential for leukocyte extravasation and tissue migration.
Why the Correct Answer Is Right:
Defective integrin anchoring impairs adhesion signaling and
leukocyte movement through endothelial surfaces.
Why the Other Options Are Wrong:
A. Mitochondrial dysfunction primarily affects ATP production,
not adhesion.
C. Ribosomal defects impair protein synthesis globally.
D. Calcium storage abnormalities affect contraction and
signaling, not migration directly.
E. Lysosomal dysfunction causes impaired intracellular
digestion rather than endothelial adhesion failure.
Exam Trap (common misconception tested):
Confusing leukocyte dysfunction with defective intracellular
killing rather than impaired migration.
High-Yield Clinical Correlation:
Leukocyte adhesion deficiencies produce severe bacterial
infections despite normal neutrophil counts.
,Q2. A patient with severe malnutrition develops generalized
edema despite normal cardiac function. Cellular analysis
demonstrates decreased synthesis of plasma proteins by
hepatocytes. The edema is best explained by failure of which
organelle?
A. Golgi apparatus
B. Lysosome
C. Rough endoplasmic reticulum
D. Smooth endoplasmic reticulum
E. Peroxisome
Correct Answer: C
Rationale:
Clinical Clue:
Reduced plasma protein synthesis points to impaired
production of secretory proteins.
Mechanism:
The rough endoplasmic reticulum synthesizes membrane-
bound and secreted proteins through ribosome attachment.
Why the Correct Answer Is Right:
Albumin synthesis depends heavily on rough ER function in
hepatocytes.
Why the Other Options Are Wrong:
A. Golgi modifies and packages proteins after synthesis.
B. Lysosomes degrade cellular debris.
, D. Smooth ER participates in lipid synthesis and detoxification.
E. Peroxisomes perform oxidative metabolic reactions.
Exam Trap (common misconception tested):
Choosing Golgi because proteins are secreted, ignoring that
synthesis occurs in rough ER.
High-Yield Clinical Correlation:
Hypoalbuminemia lowers plasma oncotic pressure, promoting
edema formation.
Q3. During an ischemic event, myocardial cells rapidly lose
membrane ion gradients before irreversible necrosis develops.
The earliest intracellular change most likely involves failure of
which process?
A. DNA replication
B. ATP-dependent membrane transport
C. Ribosomal RNA transcription
D. Lysosomal membrane stabilization
E. Collagen synthesis
Correct Answer: B
Rationale:
Clinical Clue:
Early ischemic injury initially affects energy-dependent
membrane processes.
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A 6-year-old boy develops recurrent bacterial infections
and delayed wound healing. Genetic analysis identifies a
mutation affecting integrin-mediated anchoring between
leukocytes and vascular endothelium. The impaired process
most directly disrupts which cellular function?
A. Oxidative phosphorylation within mitochondria
B. Intercellular adhesion and signal-mediated migration
C. Ribosomal assembly of structural proteins
D. Endoplasmic reticulum calcium storage
E. Lysosomal degradation of phagocytosed material
Correct Answer: B
Rationale:
,Clinical Clue:
Recurrent infections with impaired leukocyte trafficking suggest
defective adhesion-dependent migration.
Mechanism:
Integrins mediate cell-to-cell and cell-to-matrix adhesion
essential for leukocyte extravasation and tissue migration.
Why the Correct Answer Is Right:
Defective integrin anchoring impairs adhesion signaling and
leukocyte movement through endothelial surfaces.
Why the Other Options Are Wrong:
A. Mitochondrial dysfunction primarily affects ATP production,
not adhesion.
C. Ribosomal defects impair protein synthesis globally.
D. Calcium storage abnormalities affect contraction and
signaling, not migration directly.
E. Lysosomal dysfunction causes impaired intracellular
digestion rather than endothelial adhesion failure.
Exam Trap (common misconception tested):
Confusing leukocyte dysfunction with defective intracellular
killing rather than impaired migration.
High-Yield Clinical Correlation:
Leukocyte adhesion deficiencies produce severe bacterial
infections despite normal neutrophil counts.
,Q2. A patient with severe malnutrition develops generalized
edema despite normal cardiac function. Cellular analysis
demonstrates decreased synthesis of plasma proteins by
hepatocytes. The edema is best explained by failure of which
organelle?
A. Golgi apparatus
B. Lysosome
C. Rough endoplasmic reticulum
D. Smooth endoplasmic reticulum
E. Peroxisome
Correct Answer: C
Rationale:
Clinical Clue:
Reduced plasma protein synthesis points to impaired
production of secretory proteins.
Mechanism:
The rough endoplasmic reticulum synthesizes membrane-
bound and secreted proteins through ribosome attachment.
Why the Correct Answer Is Right:
Albumin synthesis depends heavily on rough ER function in
hepatocytes.
Why the Other Options Are Wrong:
A. Golgi modifies and packages proteins after synthesis.
B. Lysosomes degrade cellular debris.
, D. Smooth ER participates in lipid synthesis and detoxification.
E. Peroxisomes perform oxidative metabolic reactions.
Exam Trap (common misconception tested):
Choosing Golgi because proteins are secreted, ignoring that
synthesis occurs in rough ER.
High-Yield Clinical Correlation:
Hypoalbuminemia lowers plasma oncotic pressure, promoting
edema formation.
Q3. During an ischemic event, myocardial cells rapidly lose
membrane ion gradients before irreversible necrosis develops.
The earliest intracellular change most likely involves failure of
which process?
A. DNA replication
B. ATP-dependent membrane transport
C. Ribosomal RNA transcription
D. Lysosomal membrane stabilization
E. Collagen synthesis
Correct Answer: B
Rationale:
Clinical Clue:
Early ischemic injury initially affects energy-dependent
membrane processes.
