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WGU D115 Advanced Pathophysiology Exam (NEW UPDATED
VERSION) LATEST ACTUAL EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED QUESTIONS AND ANSWERS)- GUARANTEED
PASS A+
Question 1
Which mechanism most directly causes decreased cardiac output in cardiogenic shock?
A. Decreased preload
B. Impaired myocardial contractility
C. Excessive vasodilation
D. Reduced systemic vascular resistance
Correct Answer: B
Rationale: Cardiogenic shock results from pump failure, leading to reduced stroke volume and
cardiac output despite adequate volume.
Question 2
A patient has hyponatremia with low serum osmolality and high urine osmolality. What is the
underlying mechanism?
A. Renal sodium wasting
B. Excess aldosterone secretion
C. Inappropriate ADH secretion
D. Reduced thirst response
Correct Answer: C
Rationale: Excess ADH causes water retention, dilutional hyponatremia, and inappropriately
concentrated urine.
Question 3
Which cellular process is reversible during early ischemic injury?
A. Nuclear pyknosis
B. Lysosomal rupture
C. ATP depletion
D. Mitochondrial swelling with membrane rupture
practice exam 2026
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Correct Answer: C
Rationale: ATP depletion and cell swelling are reversible if perfusion is restored before
membrane damage occurs.
Question 4
Which acid–base disorder is expected with prolonged nasogastric suction?
A. Metabolic acidosis
B. Metabolic alkalosis
C. Respiratory acidosis
D. Respiratory alkalosis
Correct Answer: B
Rationale: Loss of gastric hydrochloric acid results in metabolic alkalosis.
Question 5
Which mechanism explains refractory hypoxemia in ARDS?
A. Bronchial obstruction
B. Alveolar hypoventilation
C. Alveolar–capillary membrane damage
D. Reduced respiratory drive
Correct Answer: C
Rationale: Increased permeability causes pulmonary edema and impaired gas exchange that is
poorly responsive to oxygen.
Question 6
Which electrolyte imbalance is most associated with ventricular arrhythmias?
A. Hyponatremia
B. Hyperkalemia
C. Hypophosphatemia
D. Hypermagnesemia
Correct Answer: B
Rationale: Potassium disturbances directly affect cardiac membrane potential and conduction.
practice exam 2026
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Question 7
Which immune mechanism causes tissue injury in type IV hypersensitivity?
A. IgE-mediated mast cell degranulation
B. Immune complex deposition
C. Complement activation
D. T-cell–mediated cytokine release
Correct Answer: D
Rationale: Type IV reactions are delayed and mediated by T lymphocytes.
Question 8
Which factor primarily increases preload in heart failure?
A. Vasodilation
B. Sodium and water retention
C. Reduced venous tone
D. Decreased sympathetic activity
Correct Answer: B
Rationale: RAAS activation leads to fluid retention and increased venous return.
Question 9
Which change explains hyperkalemia during metabolic acidosis?
A. Increased renal potassium excretion
B. Hydrogen–potassium cellular exchange
C. Increased aldosterone secretion
D. Reduced potassium intake
Correct Answer: B
Rationale: Hydrogen ions move into cells, pushing potassium into the extracellular space.
Question 10
Which mechanism causes polyuria in diabetes insipidus?
practice exam 2026
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A. Excess insulin
B. Decreased ADH activity
C. Increased aldosterone
D. Reduced GFR
Correct Answer: B
Rationale: Lack of ADH prevents water reabsorption in the collecting ducts.
Question 11
Which event triggers fever during infection?
A. Histamine release
B. Bradykinin activation
C. Prostaglandin E₂ production
D. Leukotriene synthesis
Correct Answer: C
Rationale: Cytokines stimulate hypothalamic PGE₂, raising the temperature set point.
Question 12
Which mechanism explains decreased diffusion capacity in emphysema?
A. Thickened alveolar membranes
B. Loss of alveolar surface area
C. Bronchoconstriction
D. Increased pulmonary blood flow
Correct Answer: B
Rationale: Destruction of alveolar walls reduces surface area for gas exchange.
Question 13
Which acid–base disorder is most common in early sepsis?
A. Respiratory alkalosis
B. Respiratory acidosis
C. Metabolic alkalosis
D. Compensated metabolic acidosis
practice exam 2026
WGU D115 Advanced Pathophysiology Exam (NEW UPDATED
VERSION) LATEST ACTUAL EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED QUESTIONS AND ANSWERS)- GUARANTEED
PASS A+
Question 1
Which mechanism most directly causes decreased cardiac output in cardiogenic shock?
A. Decreased preload
B. Impaired myocardial contractility
C. Excessive vasodilation
D. Reduced systemic vascular resistance
Correct Answer: B
Rationale: Cardiogenic shock results from pump failure, leading to reduced stroke volume and
cardiac output despite adequate volume.
Question 2
A patient has hyponatremia with low serum osmolality and high urine osmolality. What is the
underlying mechanism?
A. Renal sodium wasting
B. Excess aldosterone secretion
C. Inappropriate ADH secretion
D. Reduced thirst response
Correct Answer: C
Rationale: Excess ADH causes water retention, dilutional hyponatremia, and inappropriately
concentrated urine.
Question 3
Which cellular process is reversible during early ischemic injury?
A. Nuclear pyknosis
B. Lysosomal rupture
C. ATP depletion
D. Mitochondrial swelling with membrane rupture
practice exam 2026
,2|Page
Correct Answer: C
Rationale: ATP depletion and cell swelling are reversible if perfusion is restored before
membrane damage occurs.
Question 4
Which acid–base disorder is expected with prolonged nasogastric suction?
A. Metabolic acidosis
B. Metabolic alkalosis
C. Respiratory acidosis
D. Respiratory alkalosis
Correct Answer: B
Rationale: Loss of gastric hydrochloric acid results in metabolic alkalosis.
Question 5
Which mechanism explains refractory hypoxemia in ARDS?
A. Bronchial obstruction
B. Alveolar hypoventilation
C. Alveolar–capillary membrane damage
D. Reduced respiratory drive
Correct Answer: C
Rationale: Increased permeability causes pulmonary edema and impaired gas exchange that is
poorly responsive to oxygen.
Question 6
Which electrolyte imbalance is most associated with ventricular arrhythmias?
A. Hyponatremia
B. Hyperkalemia
C. Hypophosphatemia
D. Hypermagnesemia
Correct Answer: B
Rationale: Potassium disturbances directly affect cardiac membrane potential and conduction.
practice exam 2026
,3|Page
Question 7
Which immune mechanism causes tissue injury in type IV hypersensitivity?
A. IgE-mediated mast cell degranulation
B. Immune complex deposition
C. Complement activation
D. T-cell–mediated cytokine release
Correct Answer: D
Rationale: Type IV reactions are delayed and mediated by T lymphocytes.
Question 8
Which factor primarily increases preload in heart failure?
A. Vasodilation
B. Sodium and water retention
C. Reduced venous tone
D. Decreased sympathetic activity
Correct Answer: B
Rationale: RAAS activation leads to fluid retention and increased venous return.
Question 9
Which change explains hyperkalemia during metabolic acidosis?
A. Increased renal potassium excretion
B. Hydrogen–potassium cellular exchange
C. Increased aldosterone secretion
D. Reduced potassium intake
Correct Answer: B
Rationale: Hydrogen ions move into cells, pushing potassium into the extracellular space.
Question 10
Which mechanism causes polyuria in diabetes insipidus?
practice exam 2026
, 4|Page
A. Excess insulin
B. Decreased ADH activity
C. Increased aldosterone
D. Reduced GFR
Correct Answer: B
Rationale: Lack of ADH prevents water reabsorption in the collecting ducts.
Question 11
Which event triggers fever during infection?
A. Histamine release
B. Bradykinin activation
C. Prostaglandin E₂ production
D. Leukotriene synthesis
Correct Answer: C
Rationale: Cytokines stimulate hypothalamic PGE₂, raising the temperature set point.
Question 12
Which mechanism explains decreased diffusion capacity in emphysema?
A. Thickened alveolar membranes
B. Loss of alveolar surface area
C. Bronchoconstriction
D. Increased pulmonary blood flow
Correct Answer: B
Rationale: Destruction of alveolar walls reduces surface area for gas exchange.
Question 13
Which acid–base disorder is most common in early sepsis?
A. Respiratory alkalosis
B. Respiratory acidosis
C. Metabolic alkalosis
D. Compensated metabolic acidosis
practice exam 2026
