Understanding Pathophysiology
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A patient with prolonged hypotension develops cellular
swelling in the kidney tubules shortly after oxygen delivery falls.
Which mechanism most directly explains the earliest
intracellular change?
A. Increased synthesis of membrane phospholipids
B. Failure of ATP-dependent ion pumps with sodium
accumulation
C. Excessive protein export through the Golgi apparatus
D. Activation of lysosomal hydrolases by alkaline cytosol
E. Enhanced calcium sequestration by the endoplasmic
reticulum
Correct Answer: B
,Rationale:
Clinical Clue: Hypotension and low oxygen delivery precede
acute cellular swelling.
Mechanism: ATP depletion disables the sodium-potassium
pump, allowing sodium and water to enter the cell.
Why the Correct Answer Is Right: Loss of ATP-dependent ion
transport is the earliest reversible injury pattern in hypoxia and
directly produces hydropic swelling.
Why the Other Options Are Wrong: A does not explain acute
swelling; C increases secretion, not swelling; D is associated
with cell injury but not the first step here; E would reduce
cytosolic calcium, not cause early edema.
Exam Trap (common misconception tested): Confusing
membrane damage with the earlier energy-failure phase of
injury.
High-Yield Clinical Correlation: Reversible ischemic injury
typically begins with pump failure and cell swelling before
membrane rupture occurs.
Q2. A nutrient is absorbed into an epithelial cell by hitching a
ride with sodium moving down its gradient, even though the
nutrient itself is moving uphill. Which transport process best
fits this description?
A. Simple diffusion
B. Primary active transport
C. Facilitated diffusion
,D. Secondary active transport
E. Endocytosis
Correct Answer: D
Rationale:
Clinical Clue: The solute moves against its gradient but depends
on another ion’s downhill movement.
Mechanism: The sodium gradient provides stored energy for
cotransport without direct ATP use at the carrier itself.
Why the Correct Answer Is Right: This is the classic definition of
secondary active transport.
Why the Other Options Are Wrong: A requires no carrier; B
uses ATP directly at the pump; C moves substances down their
gradient only; E involves vesicle formation, not carrier-
mediated cotransport.
Exam Trap (common misconception tested): Mistaking every
energy-dependent uptake process for primary active transport.
High-Yield Clinical Correlation: Sodium gradients drive transport
of many solutes across epithelial membranes.
Q3. After minor friction, a patient develops superficial skin
blistering because adjacent epithelial cells fail to remain firmly
attached to one another. Which structure is most likely
defective?
A. Desmosomes
B. Gap junctions
C. Tight junctions
, D. Hemidesmosomes
E. Caveolae
Correct Answer: A
Rationale:
Clinical Clue: Blistering follows mechanical stress between
neighboring epithelial cells.
Mechanism: Desmosomes anchor cells to each other and resist
shear forces.
Why the Correct Answer Is Right: Loss of cell-to-cell adhesion
weakens tissue integrity and promotes separation under stress.
Why the Other Options Are Wrong: B mediate intercellular
communication, not strong attachment; C seal paracellular
spaces; D anchor cells to the basement membrane rather than
to each other; E are membrane invaginations involved in
uptake/signaling.
Exam Trap (common misconception tested): Confusing cell-to-
cell junctions with cell-to-basement membrane attachments.
High-Yield Clinical Correlation: Different adhesion structures
determine whether tissue fails between cells or at the basal
surface.
Q4. A secretory cell shows abundant rough endoplasmic
reticulum, a prominent Golgi region, and numerous membrane-
bound granules on microscopy. Which organelle is most directly
responsible for modifying and packaging the newly synthesized
protein?
8th Edition
Author(s)Sue E. Huether
TEST BANK
Q1. A patient with prolonged hypotension develops cellular
swelling in the kidney tubules shortly after oxygen delivery falls.
Which mechanism most directly explains the earliest
intracellular change?
A. Increased synthesis of membrane phospholipids
B. Failure of ATP-dependent ion pumps with sodium
accumulation
C. Excessive protein export through the Golgi apparatus
D. Activation of lysosomal hydrolases by alkaline cytosol
E. Enhanced calcium sequestration by the endoplasmic
reticulum
Correct Answer: B
,Rationale:
Clinical Clue: Hypotension and low oxygen delivery precede
acute cellular swelling.
Mechanism: ATP depletion disables the sodium-potassium
pump, allowing sodium and water to enter the cell.
Why the Correct Answer Is Right: Loss of ATP-dependent ion
transport is the earliest reversible injury pattern in hypoxia and
directly produces hydropic swelling.
Why the Other Options Are Wrong: A does not explain acute
swelling; C increases secretion, not swelling; D is associated
with cell injury but not the first step here; E would reduce
cytosolic calcium, not cause early edema.
Exam Trap (common misconception tested): Confusing
membrane damage with the earlier energy-failure phase of
injury.
High-Yield Clinical Correlation: Reversible ischemic injury
typically begins with pump failure and cell swelling before
membrane rupture occurs.
Q2. A nutrient is absorbed into an epithelial cell by hitching a
ride with sodium moving down its gradient, even though the
nutrient itself is moving uphill. Which transport process best
fits this description?
A. Simple diffusion
B. Primary active transport
C. Facilitated diffusion
,D. Secondary active transport
E. Endocytosis
Correct Answer: D
Rationale:
Clinical Clue: The solute moves against its gradient but depends
on another ion’s downhill movement.
Mechanism: The sodium gradient provides stored energy for
cotransport without direct ATP use at the carrier itself.
Why the Correct Answer Is Right: This is the classic definition of
secondary active transport.
Why the Other Options Are Wrong: A requires no carrier; B
uses ATP directly at the pump; C moves substances down their
gradient only; E involves vesicle formation, not carrier-
mediated cotransport.
Exam Trap (common misconception tested): Mistaking every
energy-dependent uptake process for primary active transport.
High-Yield Clinical Correlation: Sodium gradients drive transport
of many solutes across epithelial membranes.
Q3. After minor friction, a patient develops superficial skin
blistering because adjacent epithelial cells fail to remain firmly
attached to one another. Which structure is most likely
defective?
A. Desmosomes
B. Gap junctions
C. Tight junctions
, D. Hemidesmosomes
E. Caveolae
Correct Answer: A
Rationale:
Clinical Clue: Blistering follows mechanical stress between
neighboring epithelial cells.
Mechanism: Desmosomes anchor cells to each other and resist
shear forces.
Why the Correct Answer Is Right: Loss of cell-to-cell adhesion
weakens tissue integrity and promotes separation under stress.
Why the Other Options Are Wrong: B mediate intercellular
communication, not strong attachment; C seal paracellular
spaces; D anchor cells to the basement membrane rather than
to each other; E are membrane invaginations involved in
uptake/signaling.
Exam Trap (common misconception tested): Confusing cell-to-
cell junctions with cell-to-basement membrane attachments.
High-Yield Clinical Correlation: Different adhesion structures
determine whether tissue fails between cells or at the basal
surface.
Q4. A secretory cell shows abundant rough endoplasmic
reticulum, a prominent Golgi region, and numerous membrane-
bound granules on microscopy. Which organelle is most directly
responsible for modifying and packaging the newly synthesized
protein?
