NURS 231 Pathophysiology | Portage Learning | Final Exam
2026/2027 Complete Final Examination | Actual Questions &
Verified Answers | Comprehensive Pathophysiology
Assessment | Pass Guarantee
1. A 68-year-old male with a 40-pack-year smoking history develops chronic
hypoxemia (PaO₂ 55 mmHg). Which cellular adaptation will most likely occur in
his peripheral tissues to improve oxygen delivery?
A. Hypertrophy of mitochondria to increase ATP production efficiency
B. Hyperplasia of erythropoietin receptors on RBC precursors
C. Metaplasia of type I alveolar cells to type II cells
D. Increased 2,3-bisphosphoglycerate (2,3-BPG) production in RBCs
Correct Answer: D
Rationale: Chronic hypoxemia triggers increased synthesis of 2,3-BPG in erythrocytes,
which shifts the oxyhemoglobin dissociation curve to the right. This rightward shift
decreases hemoglobin's affinity for oxygen, facilitating oxygen release to tissues at
lower PaO₂ levels. Option A is incorrect because mitochondrial hypertrophy occurs with
chronic cellular demand (e.g., athlete's muscle) but doesn't specifically address oxygen
delivery adaptation. Option B is incorrect because erythropoietin receptors aren't
upregulated; instead, erythropoietin production increases. Option C describes an
incorrect cellular transformation that doesn't occur in response to hypoxemia.
2. A patient with severe vomiting for 48 hours presents with muscle weakness and
tetany. ABG reveals: pH 7.52, PaCO₂ 48 mmHg, HCO₃⁻ 38 mEq/L. Which
electrolyte imbalance is most likely causing the neurologic symptoms?
,A. Hypercalcemia from metabolic alkalosis-induced increased protein binding
B. Hypokalemia from intracellular shift and renal losses
C. Hypomagnesemia secondary to gastrointestinal losses
D. Hypocalcemia from increased protein binding and alkalosis-driven decreased
ionization
Correct Answer: D
Rationale: Metabolic alkalosis increases protein binding of calcium (more Ca²⁺ binds to
albumin) and decreases hydrogen ion concentration, reducing ionized calcium levels.
The decreased ionized (free) calcium increases neuronal membrane excitability, causing
tetany. Option A is incorrect because hypercalcemia would suppress, not cause, tetany.
Option B is incorrect because while hypokalemia occurs with vomiting, it doesn't directly
cause tetany. Option C is incorrect because magnesium loss doesn't cause tetany
through the alkalosis mechanism.
3. In hemorrhagic shock, which compensatory mechanism represents the transition
from compensated to decompensated shock?
A. Increased sympathetic tone causing vasoconstriction
B. Activation of the renin-angiotensin-aldosterone system
C. Tissue hypoxia leading to lactic acidosis and vasodilation
D. Catecholamine-mediated tachycardia
Correct Answer: C
Rationale: In decompensated shock, prolonged tissue hypoxia leads to anaerobic
metabolism and lactic acidosis. The accumulating hydrogen ions cause precapillary
arteriolar dilation, reversing the compensatory vasoconstriction. This results in stagnant
blood flow, worsening hypoxia, and irreversible cellular injury. Options A, B, and D are
compensatory mechanisms that maintain perfusion in early (compensated) shock and
do not indicate progression to decompensation.
, 4. A patient with chronic alcoholism develops severe pancreatitis. Which
pathophysiologic mechanism directly links alcohol metabolism to pancreatic
autodigestion?
A. Accumulation of fatty acids causing fat necrosis
B. Generation of free radicals and premature activation of trypsinogen within acinar
cells
C. Hypertriglyceridemia causing capillary occlusion
D. Direct toxic effect on pancreatic ductal cells causing obstruction
Correct Answer: B
Rationale: Alcohol metabolism generates reactive oxygen species and increases
digestive enzyme synthesis in pancreatic acinar cells. This oxidative stress and
increased enzyme load cause premature activation of trypsinogen to trypsin within the
cells, triggering autodigestion. Option A describes a consequence, not the initiating
mechanism. Option C is a separate risk factor, not the direct alcohol-related
mechanism. Option D is incorrect because alcohol's primary toxic effect is on acinar
cells, not ductal obstruction.
5. A 55-year-old female with rheumatoid arthritis develops bilateral hand
deformities. Ulnar deviation of the fingers occurs due to which pathophysiologic
process?
A. Degenerative cartilage breakdown and osteophyte formation
B. Pannus formation and synovial inflammation causing ligament laxity and tendon
displacement
C. Autoantibody deposition directly destroying bone cortex
D. Hypertrophic bone formation compressing tendons
Correct Answer: B
Rationale: Rheumatoid arthritis involves autoimmune-mediated synovitis with pannus
(vascular granulation tissue) formation. The inflammatory cytokines (TNF-α, IL-1)
, degrade cartilage and bone, while chronic inflammation stretches the joint capsule and
collateral ligaments, causing ulnar deviation of the extensor tendons. Option A
describes osteoarthritis. Option C incorrectly localizes the damage. Option D is
characteristic of osteophytic changes, not RA.
6. A patient with type 2 diabetes mellitus has a fasting blood glucose of 240 mg/dL.
Which cellular dysfunction most directly contributes to hyperglycemia in this
disease?
A. Autoimmune destruction of pancreatic beta cells
B. Downregulation of GLUT-4 receptors in peripheral tissues
C. Excessive hepatic gluconeogenesis from glycogen depletion
D. Reduced intestinal glucose absorption
Correct Answer: B
Rationale: Type 2 DM involves insulin resistance where target cells (muscle, adipose)
downregulate GLUT-4 insulin-dependent glucose transporters, impairing glucose uptake.
This leaves excess glucose in circulation despite adequate or elevated insulin. Option A
describes type 1 DM. Option C is incorrect because glycogen stores are typically normal
or increased initially. Option D is physiologically incorrect; glucose absorption is not
impaired.
7. A 70-year-old male with chronic kidney disease stage 4 develops anemia. Which
pathophysiologic mechanism is most directly responsible?
A. Reduced dietary iron absorption from uremic gastritis
B. Decreased erythropoietin production by diseased kidneys
C. Hemolysis from accumulated uremic toxins
D. Chronic gastrointestinal bleeding from platelet dysfunction
Correct Answer: B
2026/2027 Complete Final Examination | Actual Questions &
Verified Answers | Comprehensive Pathophysiology
Assessment | Pass Guarantee
1. A 68-year-old male with a 40-pack-year smoking history develops chronic
hypoxemia (PaO₂ 55 mmHg). Which cellular adaptation will most likely occur in
his peripheral tissues to improve oxygen delivery?
A. Hypertrophy of mitochondria to increase ATP production efficiency
B. Hyperplasia of erythropoietin receptors on RBC precursors
C. Metaplasia of type I alveolar cells to type II cells
D. Increased 2,3-bisphosphoglycerate (2,3-BPG) production in RBCs
Correct Answer: D
Rationale: Chronic hypoxemia triggers increased synthesis of 2,3-BPG in erythrocytes,
which shifts the oxyhemoglobin dissociation curve to the right. This rightward shift
decreases hemoglobin's affinity for oxygen, facilitating oxygen release to tissues at
lower PaO₂ levels. Option A is incorrect because mitochondrial hypertrophy occurs with
chronic cellular demand (e.g., athlete's muscle) but doesn't specifically address oxygen
delivery adaptation. Option B is incorrect because erythropoietin receptors aren't
upregulated; instead, erythropoietin production increases. Option C describes an
incorrect cellular transformation that doesn't occur in response to hypoxemia.
2. A patient with severe vomiting for 48 hours presents with muscle weakness and
tetany. ABG reveals: pH 7.52, PaCO₂ 48 mmHg, HCO₃⁻ 38 mEq/L. Which
electrolyte imbalance is most likely causing the neurologic symptoms?
,A. Hypercalcemia from metabolic alkalosis-induced increased protein binding
B. Hypokalemia from intracellular shift and renal losses
C. Hypomagnesemia secondary to gastrointestinal losses
D. Hypocalcemia from increased protein binding and alkalosis-driven decreased
ionization
Correct Answer: D
Rationale: Metabolic alkalosis increases protein binding of calcium (more Ca²⁺ binds to
albumin) and decreases hydrogen ion concentration, reducing ionized calcium levels.
The decreased ionized (free) calcium increases neuronal membrane excitability, causing
tetany. Option A is incorrect because hypercalcemia would suppress, not cause, tetany.
Option B is incorrect because while hypokalemia occurs with vomiting, it doesn't directly
cause tetany. Option C is incorrect because magnesium loss doesn't cause tetany
through the alkalosis mechanism.
3. In hemorrhagic shock, which compensatory mechanism represents the transition
from compensated to decompensated shock?
A. Increased sympathetic tone causing vasoconstriction
B. Activation of the renin-angiotensin-aldosterone system
C. Tissue hypoxia leading to lactic acidosis and vasodilation
D. Catecholamine-mediated tachycardia
Correct Answer: C
Rationale: In decompensated shock, prolonged tissue hypoxia leads to anaerobic
metabolism and lactic acidosis. The accumulating hydrogen ions cause precapillary
arteriolar dilation, reversing the compensatory vasoconstriction. This results in stagnant
blood flow, worsening hypoxia, and irreversible cellular injury. Options A, B, and D are
compensatory mechanisms that maintain perfusion in early (compensated) shock and
do not indicate progression to decompensation.
, 4. A patient with chronic alcoholism develops severe pancreatitis. Which
pathophysiologic mechanism directly links alcohol metabolism to pancreatic
autodigestion?
A. Accumulation of fatty acids causing fat necrosis
B. Generation of free radicals and premature activation of trypsinogen within acinar
cells
C. Hypertriglyceridemia causing capillary occlusion
D. Direct toxic effect on pancreatic ductal cells causing obstruction
Correct Answer: B
Rationale: Alcohol metabolism generates reactive oxygen species and increases
digestive enzyme synthesis in pancreatic acinar cells. This oxidative stress and
increased enzyme load cause premature activation of trypsinogen to trypsin within the
cells, triggering autodigestion. Option A describes a consequence, not the initiating
mechanism. Option C is a separate risk factor, not the direct alcohol-related
mechanism. Option D is incorrect because alcohol's primary toxic effect is on acinar
cells, not ductal obstruction.
5. A 55-year-old female with rheumatoid arthritis develops bilateral hand
deformities. Ulnar deviation of the fingers occurs due to which pathophysiologic
process?
A. Degenerative cartilage breakdown and osteophyte formation
B. Pannus formation and synovial inflammation causing ligament laxity and tendon
displacement
C. Autoantibody deposition directly destroying bone cortex
D. Hypertrophic bone formation compressing tendons
Correct Answer: B
Rationale: Rheumatoid arthritis involves autoimmune-mediated synovitis with pannus
(vascular granulation tissue) formation. The inflammatory cytokines (TNF-α, IL-1)
, degrade cartilage and bone, while chronic inflammation stretches the joint capsule and
collateral ligaments, causing ulnar deviation of the extensor tendons. Option A
describes osteoarthritis. Option C incorrectly localizes the damage. Option D is
characteristic of osteophytic changes, not RA.
6. A patient with type 2 diabetes mellitus has a fasting blood glucose of 240 mg/dL.
Which cellular dysfunction most directly contributes to hyperglycemia in this
disease?
A. Autoimmune destruction of pancreatic beta cells
B. Downregulation of GLUT-4 receptors in peripheral tissues
C. Excessive hepatic gluconeogenesis from glycogen depletion
D. Reduced intestinal glucose absorption
Correct Answer: B
Rationale: Type 2 DM involves insulin resistance where target cells (muscle, adipose)
downregulate GLUT-4 insulin-dependent glucose transporters, impairing glucose uptake.
This leaves excess glucose in circulation despite adequate or elevated insulin. Option A
describes type 1 DM. Option C is incorrect because glycogen stores are typically normal
or increased initially. Option D is physiologically incorrect; glucose absorption is not
impaired.
7. A 70-year-old male with chronic kidney disease stage 4 develops anemia. Which
pathophysiologic mechanism is most directly responsible?
A. Reduced dietary iron absorption from uremic gastritis
B. Decreased erythropoietin production by diseased kidneys
C. Hemolysis from accumulated uremic toxins
D. Chronic gastrointestinal bleeding from platelet dysfunction
Correct Answer: B
