NR 565 Advanced Pathophysiology Exam
Questions with Correct Answers
(VerifiedAnswers) plus Rationales 2026 Q&A
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Question 1
A patient develops severe tissue hypoxia following prolonged
hypotension. Which cellular change occurs earliest when
oxygen delivery to the cell becomes inadequate?
A. Increased oxidative phosphorylation
B. Increased intracellular ATP production
C. Failure of the sodium-potassium pump
D. Increased protein synthesis
Correct Answer: C. Failure of the sodium-potassium pump
Rationale: Oxygen deprivation decreases mitochondrial
oxidative phosphorylation and ATP production. As ATP becomes
insufficient, ATP-dependent membrane pumps, particularly the
sodium-potassium pump, begin to fail. Sodium and water move
into the cell, producing cellular swelling. If hypoxia persists,
membrane damage, calcium influx, mitochondrial dysfunction,
and eventually irreversible cell injury can develop. Increased
,oxidative phosphorylation and protein synthesis would not occur
during significant cellular hypoxia.
Question 2
Which mechanism best explains the development of edema
during severe hypoalbuminemia?
A. Increased plasma oncotic pressure
B. Decreased capillary hydrostatic pressure
C. Decreased plasma oncotic pressure
D. Increased lymphatic drainage
Correct Answer: C. Decreased plasma oncotic pressure
Rationale: Albumin is the major contributor to plasma colloid
oncotic pressure. When serum albumin falls substantially, the
intravascular force retaining water decreases. Fluid therefore
shifts from the vascular space into the interstitial compartment,
producing edema. This mechanism is characteristic of conditions
such as severe liver disease, nephrotic syndrome, and protein-
losing states.
Question 3
A patient with acute inflammation has warmth, erythema,
swelling, and pain at the affected site. Which mediator is
,primarily associated with early vasodilation and increased
vascular permeability?
A. Histamine
B. Insulin
C. Erythropoietin
D. Aldosterone
Correct Answer: A. Histamine
Rationale: Histamine is released primarily from mast cells
during the early inflammatory response. It promotes arteriolar
vasodilation and increases permeability of postcapillary venules.
These changes permit plasma proteins and leukocytes to leave
the circulation and enter the injured tissue. The resulting
increased blood flow contributes to redness and warmth, while
fluid movement into the interstitium contributes to swelling.
Question 4
Which finding most strongly indicates a systemic inflammatory
response rather than a localized inflammatory response?
A. Localized erythema
B. Mild tenderness at the injury site
C. Fever with generalized tachycardia
D. Localized edema
Correct Answer: C. Fever with generalized tachycardia
, Rationale: A systemic inflammatory response involves mediators
such as cytokines acting throughout the body. Fever,
tachycardia, leukocytosis, changes in vascular tone, and
alterations in metabolic activity may occur. Localized erythema,
tenderness, and edema primarily reflect the inflammatory
response at the site of injury.
Question 5
A patient with severe bacterial infection develops hypotension,
elevated lactate, and altered mental status. Which
pathophysiologic process most directly explains the elevated
lactate?
A. Increased aerobic metabolism
B. Tissue hypoperfusion with increased anaerobic metabolism
C. Increased renal bicarbonate production
D. Excessive insulin secretion
Correct Answer: B. Tissue hypoperfusion with increased
anaerobic metabolism
Rationale: In shock, inadequate tissue perfusion limits oxygen
availability at the cellular level. Cells increasingly rely on
anaerobic glycolysis, resulting in conversion of pyruvate to
lactate. Elevated lactate therefore serves as an important
marker of impaired oxygen utilization or delivery. Persistent
Questions with Correct Answers
(VerifiedAnswers) plus Rationales 2026 Q&A
Instant Download PDF
Question 1
A patient develops severe tissue hypoxia following prolonged
hypotension. Which cellular change occurs earliest when
oxygen delivery to the cell becomes inadequate?
A. Increased oxidative phosphorylation
B. Increased intracellular ATP production
C. Failure of the sodium-potassium pump
D. Increased protein synthesis
Correct Answer: C. Failure of the sodium-potassium pump
Rationale: Oxygen deprivation decreases mitochondrial
oxidative phosphorylation and ATP production. As ATP becomes
insufficient, ATP-dependent membrane pumps, particularly the
sodium-potassium pump, begin to fail. Sodium and water move
into the cell, producing cellular swelling. If hypoxia persists,
membrane damage, calcium influx, mitochondrial dysfunction,
and eventually irreversible cell injury can develop. Increased
,oxidative phosphorylation and protein synthesis would not occur
during significant cellular hypoxia.
Question 2
Which mechanism best explains the development of edema
during severe hypoalbuminemia?
A. Increased plasma oncotic pressure
B. Decreased capillary hydrostatic pressure
C. Decreased plasma oncotic pressure
D. Increased lymphatic drainage
Correct Answer: C. Decreased plasma oncotic pressure
Rationale: Albumin is the major contributor to plasma colloid
oncotic pressure. When serum albumin falls substantially, the
intravascular force retaining water decreases. Fluid therefore
shifts from the vascular space into the interstitial compartment,
producing edema. This mechanism is characteristic of conditions
such as severe liver disease, nephrotic syndrome, and protein-
losing states.
Question 3
A patient with acute inflammation has warmth, erythema,
swelling, and pain at the affected site. Which mediator is
,primarily associated with early vasodilation and increased
vascular permeability?
A. Histamine
B. Insulin
C. Erythropoietin
D. Aldosterone
Correct Answer: A. Histamine
Rationale: Histamine is released primarily from mast cells
during the early inflammatory response. It promotes arteriolar
vasodilation and increases permeability of postcapillary venules.
These changes permit plasma proteins and leukocytes to leave
the circulation and enter the injured tissue. The resulting
increased blood flow contributes to redness and warmth, while
fluid movement into the interstitium contributes to swelling.
Question 4
Which finding most strongly indicates a systemic inflammatory
response rather than a localized inflammatory response?
A. Localized erythema
B. Mild tenderness at the injury site
C. Fever with generalized tachycardia
D. Localized edema
Correct Answer: C. Fever with generalized tachycardia
, Rationale: A systemic inflammatory response involves mediators
such as cytokines acting throughout the body. Fever,
tachycardia, leukocytosis, changes in vascular tone, and
alterations in metabolic activity may occur. Localized erythema,
tenderness, and edema primarily reflect the inflammatory
response at the site of injury.
Question 5
A patient with severe bacterial infection develops hypotension,
elevated lactate, and altered mental status. Which
pathophysiologic process most directly explains the elevated
lactate?
A. Increased aerobic metabolism
B. Tissue hypoperfusion with increased anaerobic metabolism
C. Increased renal bicarbonate production
D. Excessive insulin secretion
Correct Answer: B. Tissue hypoperfusion with increased
anaerobic metabolism
Rationale: In shock, inadequate tissue perfusion limits oxygen
availability at the cellular level. Cells increasingly rely on
anaerobic glycolysis, resulting in conversion of pyruvate to
lactate. Elevated lactate therefore serves as an important
marker of impaired oxygen utilization or delivery. Persistent
