WALDEN UNIVERSITY
NURS 6501: Advanced Pathophysiology
Comprehensive Practice Final Exam
Multiple Choice with Rationale
1. A patient with Alzheimer's disease presents with progressive memory loss. At the cellular
level, the pathophysiology of this patient's condition is primarily characterized by:
A) Degeneration of dopaminergic neurons in the substantia nigra
B) Extracellular beta-amyloid plaques and intracellular neurofibrillary tangles
C) Demyelination of the upper motor neurons in the corticospinal tract
D) Overproduction of gamma-aminobutyric acid (GABA) in the hippocampus
CORRECT ANSWER ✅✅ B) Extracellular beta-amyloid plaques and intracellular
neurofibrillary tangles
Rationale: Alzheimer’s disease is definitively characterized by extracellular beta-amyloid
plaques (toxic to neurons) and intracellular neurofibrillary tangles (composed of
hyperphosphorylated tau protein). Option A describes Parkinson's disease. Option C describes
multiple sclerosis. Option D is incorrect because Alzheimer's is associated with an
acetylcholine deficit, not GABA overproduction.
,2. A 55-year-old male presents with dependent peripheral edema, jugular venous distention,
and hepatomegaly. An echocardiogram shows right ventricular hypertrophy. Which of the
following mechanisms best explains the development of his edema?
A) Increased oncotic pressure in the capillaries
B) Decreased capillary hydrostatic pressure
C) Increased capillary hydrostatic pressure due to venous congestion
D) Obstructed lymphatic drainage in the lower extremities
CORRECT ANSWER ✅✅ C) Increased capillary hydrostatic pressure due to venous
congestion
Rationale: Right-sided heart failure causes blood to back up into the venous system. This
increases venous pressure, which translates into increased capillary hydrostatic pressure,
pushing fluid out of the capillaries into the interstitial space.
3. A patient with a long-standing history of COPD has the following arterial blood gas (ABG)
results: pH 7.32, PaCO2 58 mm Hg, HCO3- 32 mEq/L. Which of the following
pathophysiological processes is occurring?
A) Uncompensated respiratory acidosis
B) Partially compensated respiratory acidosis
C) Uncompensated metabolic alkalosis
D) Partially compensated metabolic acidosis
CORRECT ANSWER ✅✅ B) Partially compensated respiratory acidosis
Rationale: The low pH indicates acidosis. The high PaCO2 indicates it is respiratory in origin
(common in COPD). The elevated HCO3- indicates the kidneys are retaining bicarbonate to
buffer the acid. Because the pH is not yet back to normal, it is partially compensated.
, 4. A 4-year-old child develops severe, itchy wheals after a bee sting. Which of the following
immunologic mechanisms is the primary driver of this child's symptoms?
A) Type I hypersensitivity reaction (IgE-mediated)
B) Type II hypersensitivity reaction (IgG/IgM-mediated)
C) Type III hypersensitivity reaction (immune complex-mediated)
D) Type IV hypersensitivity reaction (T-cell mediated)
CORRECT ANSWER ✅✅ A) Type I hypersensitivity reaction (IgE-mediated)
Rationale: Wheals (hives) and anaphylaxis are classic Type I reactions. Re-exposure to an
allergen cross-links IgE on mast cells, causing degranulation and histamine release.
5. A 45-year-old female is diagnosed with nephrotic syndrome. Laboratory tests reveal severe
proteinuria (4+), hypoalbuminemia, and hyperlipidemia. The primary pathophysiologic
mechanism of her edema is:
A) Decreased glomerular filtration rate (GFR) leading to fluid retention
B) Increased aldosterone secretion from the adrenal cortex
C) Decreased plasma oncotic pressure due to albumin loss in the urine
D) Activation of the renin-angiotensin-aldosterone system (RAAS) due to renal ischemia
CORRECT ANSWER ✅✅ C) Decreased plasma oncotic pressure due to albumin loss in the
urine
Rationale: Massive proteinuria leads to hypoalbuminemia. Albumin is the main driver of
plasma oncotic pressure (which holds fluid inside vessels). When oncotic pressure drops, fluid
leaks into the interstitial tissue causing edema.
6. A patient presents with fatigue, pallor, and a sore tongue. Blood work reveals a hemoglobin
of 9.0 g/dL and a Mean Corpuscular Volume (MCV) of 110 fL (high). The pathophysiological
mechanism is:
A) Impaired iron absorption leading to defective hemoglobin synthesis
NURS 6501: Advanced Pathophysiology
Comprehensive Practice Final Exam
Multiple Choice with Rationale
1. A patient with Alzheimer's disease presents with progressive memory loss. At the cellular
level, the pathophysiology of this patient's condition is primarily characterized by:
A) Degeneration of dopaminergic neurons in the substantia nigra
B) Extracellular beta-amyloid plaques and intracellular neurofibrillary tangles
C) Demyelination of the upper motor neurons in the corticospinal tract
D) Overproduction of gamma-aminobutyric acid (GABA) in the hippocampus
CORRECT ANSWER ✅✅ B) Extracellular beta-amyloid plaques and intracellular
neurofibrillary tangles
Rationale: Alzheimer’s disease is definitively characterized by extracellular beta-amyloid
plaques (toxic to neurons) and intracellular neurofibrillary tangles (composed of
hyperphosphorylated tau protein). Option A describes Parkinson's disease. Option C describes
multiple sclerosis. Option D is incorrect because Alzheimer's is associated with an
acetylcholine deficit, not GABA overproduction.
,2. A 55-year-old male presents with dependent peripheral edema, jugular venous distention,
and hepatomegaly. An echocardiogram shows right ventricular hypertrophy. Which of the
following mechanisms best explains the development of his edema?
A) Increased oncotic pressure in the capillaries
B) Decreased capillary hydrostatic pressure
C) Increased capillary hydrostatic pressure due to venous congestion
D) Obstructed lymphatic drainage in the lower extremities
CORRECT ANSWER ✅✅ C) Increased capillary hydrostatic pressure due to venous
congestion
Rationale: Right-sided heart failure causes blood to back up into the venous system. This
increases venous pressure, which translates into increased capillary hydrostatic pressure,
pushing fluid out of the capillaries into the interstitial space.
3. A patient with a long-standing history of COPD has the following arterial blood gas (ABG)
results: pH 7.32, PaCO2 58 mm Hg, HCO3- 32 mEq/L. Which of the following
pathophysiological processes is occurring?
A) Uncompensated respiratory acidosis
B) Partially compensated respiratory acidosis
C) Uncompensated metabolic alkalosis
D) Partially compensated metabolic acidosis
CORRECT ANSWER ✅✅ B) Partially compensated respiratory acidosis
Rationale: The low pH indicates acidosis. The high PaCO2 indicates it is respiratory in origin
(common in COPD). The elevated HCO3- indicates the kidneys are retaining bicarbonate to
buffer the acid. Because the pH is not yet back to normal, it is partially compensated.
, 4. A 4-year-old child develops severe, itchy wheals after a bee sting. Which of the following
immunologic mechanisms is the primary driver of this child's symptoms?
A) Type I hypersensitivity reaction (IgE-mediated)
B) Type II hypersensitivity reaction (IgG/IgM-mediated)
C) Type III hypersensitivity reaction (immune complex-mediated)
D) Type IV hypersensitivity reaction (T-cell mediated)
CORRECT ANSWER ✅✅ A) Type I hypersensitivity reaction (IgE-mediated)
Rationale: Wheals (hives) and anaphylaxis are classic Type I reactions. Re-exposure to an
allergen cross-links IgE on mast cells, causing degranulation and histamine release.
5. A 45-year-old female is diagnosed with nephrotic syndrome. Laboratory tests reveal severe
proteinuria (4+), hypoalbuminemia, and hyperlipidemia. The primary pathophysiologic
mechanism of her edema is:
A) Decreased glomerular filtration rate (GFR) leading to fluid retention
B) Increased aldosterone secretion from the adrenal cortex
C) Decreased plasma oncotic pressure due to albumin loss in the urine
D) Activation of the renin-angiotensin-aldosterone system (RAAS) due to renal ischemia
CORRECT ANSWER ✅✅ C) Decreased plasma oncotic pressure due to albumin loss in the
urine
Rationale: Massive proteinuria leads to hypoalbuminemia. Albumin is the main driver of
plasma oncotic pressure (which holds fluid inside vessels). When oncotic pressure drops, fluid
leaks into the interstitial tissue causing edema.
6. A patient presents with fatigue, pallor, and a sore tongue. Blood work reveals a hemoglobin
of 9.0 g/dL and a Mean Corpuscular Volume (MCV) of 110 fL (high). The pathophysiological
mechanism is:
A) Impaired iron absorption leading to defective hemoglobin synthesis
