WGU D236 Pathophysiology Ultimate Review Bundle
| Final Assessment Practice QUESTIONs, Verified
Answers & Step-by-Step Rationales – Latest Update
2026/2027
QUESTION 1
What is the primary metabolic and electrolyte disturbance
characteristic of Tumor Lysis Syndrome (TLS)?
• A. Hypercalcemia, hypophosphatemia, and hyperkalemia
• B. Hyperkalemia, hyperphosphatemia, hypocalcemia, and
hyperuricemia
• C. Hypokalemia, hypophosphatemia, and metabolic alkalosis
• D. Hypernatremia, hyperchloremia, and metabolic acidosis
Correct Answer: B. Hyperkalemia, hyperphosphatemia, hypocalcemia,
and hyperuricemia
Detailed Rationale: Tumor lysis syndrome occurs when a large number
of cancer cells die rapidly, releasing their intracellular contents into the
bloodstream. This leads to hyperkalemia (from potassium release),
hyperphosphatemia (from nucleic acids), hypocalcemia (as calcium
binds excess phosphate), and hyperuricemia (from purine breakdown),
which can cause acute kidney injury.
QUESTION 2
,What is the underlying pathophysiology of Hepatorenal Syndrome in a
patient with advanced cirrhosis?
• A. Direct toxic destruction of renal tubular epithelial cells by
bilirubin crystals
• B. Profound renal vasoconstriction caused by splanchnic arterial
vasodilation and decreased effective arterial blood volume,
leading to severe renal hypoperfusion without structural kidney
damage
• C. Immune complex deposition in the glomerular basement
membrane triggered by portal hypertension
• D. Complete physical obstruction of the renal arteries by hepatic
microthrombi
Correct Answer: B. Profound renal vasoconstriction caused by
splanchnic arterial vasodilation and decreased effective arterial blood
volume, leading to severe renal hypoperfusion without structural
kidney damage
Detailed Rationale: Advanced cirrhosis causes severe splanchnic
vasodilation, reducing effective circulating blood volume. This triggers
compensatory activation of vasoconstrictive systems (RAAS,
sympathetic nervous system), which preferentially constricts renal
blood vessels, causing functional renal failure without intrinsic tubular
necrosis.
QUESTION 3
What is the classic immunopathological mechanism of Goodpasture
Syndrome?
, • A. Type II hypersensitivity mediated by autoantibodies directed
against the non-collagenous domain of the alpha-3 chain of type
IV collagen in the basement membranes of renal glomeruli and
pulmonary alveoli.
• B. Type III hypersensitivity caused by circulating immune
complexes trapped in the pulmonary capillaries.
• C. Type IV cell-mediated granulomatous destruction of the renal
pelvis.
• D. Autoimmune destruction of surfactant-producing type II
pneumocytes.
Correct Answer: A. Type II hypersensitivity mediated by autoantibodies
directed against the non-collagenous domain of the alpha-3 chain of
type IV collagen in the basement membranes of renal glomeruli and
pulmonary alveoli.
Detailed Rationale: Goodpasture syndrome is an autoimmune
condition characterized by Type II cytotoxic reactions where IgG
antibodies attack type IV collagen found in basement membranes,
leading to rapidly progressive glomerulonephritis and pulmonary
hemorrhage.
QUESTION 4
How does Lambert-Eaton Myasthenic Syndrome differ from Myasthenia
Gravis regarding its neuromuscular pathophysiology?
• A. Lambert-Eaton involves autoantibodies targeting presynaptic
voltage-gated calcium channels (reducing acetylcholine release),
, whereas Myasthenia Gravis targets postsynaptic acetylcholine
receptors.
• B. Lambert-Eaton is caused by complete central nervous system
demyelination, whereas Myasthenia Gravis affects peripheral
sensory nerves.
• C. Lambert-Eaton symptoms worsen with repeated muscle use,
while Myasthenia Gravis strength improves with use.
• D. Lambert-Eaton is caused by a genetic point mutation in
mitochondrial DNA, while Myasthenia Gravis is purely viral.
Correct Answer: A. Lambert-Eaton involves autoantibodies targeting
presynaptic voltage-gated calcium channels (reducing acetylcholine
release), whereas Myasthenia Gravis targets postsynaptic acetylcholine
receptors.
Detailed Rationale: In Lambert-Eaton syndrome, autoantibodies attack
presynaptic calcium channels at the neuromuscular junction, impairing
acetylcholine exocytosis. Clinically, muscle strength often improves
temporarily with repetitive use as calcium accumulates, distinguishing it
from Myasthenia Gravis.
QUESTION 5
What is the classic clinical triad associated with Normal Pressure
Hydrocephalus (NPH)?
• A. Seizures, visual loss, and severe headache
• B. Gait disturbance, cognitive impairment (dementia), and urinary
incontinence
• C. Resting tremor, bradykinesia, and rigidity
| Final Assessment Practice QUESTIONs, Verified
Answers & Step-by-Step Rationales – Latest Update
2026/2027
QUESTION 1
What is the primary metabolic and electrolyte disturbance
characteristic of Tumor Lysis Syndrome (TLS)?
• A. Hypercalcemia, hypophosphatemia, and hyperkalemia
• B. Hyperkalemia, hyperphosphatemia, hypocalcemia, and
hyperuricemia
• C. Hypokalemia, hypophosphatemia, and metabolic alkalosis
• D. Hypernatremia, hyperchloremia, and metabolic acidosis
Correct Answer: B. Hyperkalemia, hyperphosphatemia, hypocalcemia,
and hyperuricemia
Detailed Rationale: Tumor lysis syndrome occurs when a large number
of cancer cells die rapidly, releasing their intracellular contents into the
bloodstream. This leads to hyperkalemia (from potassium release),
hyperphosphatemia (from nucleic acids), hypocalcemia (as calcium
binds excess phosphate), and hyperuricemia (from purine breakdown),
which can cause acute kidney injury.
QUESTION 2
,What is the underlying pathophysiology of Hepatorenal Syndrome in a
patient with advanced cirrhosis?
• A. Direct toxic destruction of renal tubular epithelial cells by
bilirubin crystals
• B. Profound renal vasoconstriction caused by splanchnic arterial
vasodilation and decreased effective arterial blood volume,
leading to severe renal hypoperfusion without structural kidney
damage
• C. Immune complex deposition in the glomerular basement
membrane triggered by portal hypertension
• D. Complete physical obstruction of the renal arteries by hepatic
microthrombi
Correct Answer: B. Profound renal vasoconstriction caused by
splanchnic arterial vasodilation and decreased effective arterial blood
volume, leading to severe renal hypoperfusion without structural
kidney damage
Detailed Rationale: Advanced cirrhosis causes severe splanchnic
vasodilation, reducing effective circulating blood volume. This triggers
compensatory activation of vasoconstrictive systems (RAAS,
sympathetic nervous system), which preferentially constricts renal
blood vessels, causing functional renal failure without intrinsic tubular
necrosis.
QUESTION 3
What is the classic immunopathological mechanism of Goodpasture
Syndrome?
, • A. Type II hypersensitivity mediated by autoantibodies directed
against the non-collagenous domain of the alpha-3 chain of type
IV collagen in the basement membranes of renal glomeruli and
pulmonary alveoli.
• B. Type III hypersensitivity caused by circulating immune
complexes trapped in the pulmonary capillaries.
• C. Type IV cell-mediated granulomatous destruction of the renal
pelvis.
• D. Autoimmune destruction of surfactant-producing type II
pneumocytes.
Correct Answer: A. Type II hypersensitivity mediated by autoantibodies
directed against the non-collagenous domain of the alpha-3 chain of
type IV collagen in the basement membranes of renal glomeruli and
pulmonary alveoli.
Detailed Rationale: Goodpasture syndrome is an autoimmune
condition characterized by Type II cytotoxic reactions where IgG
antibodies attack type IV collagen found in basement membranes,
leading to rapidly progressive glomerulonephritis and pulmonary
hemorrhage.
QUESTION 4
How does Lambert-Eaton Myasthenic Syndrome differ from Myasthenia
Gravis regarding its neuromuscular pathophysiology?
• A. Lambert-Eaton involves autoantibodies targeting presynaptic
voltage-gated calcium channels (reducing acetylcholine release),
, whereas Myasthenia Gravis targets postsynaptic acetylcholine
receptors.
• B. Lambert-Eaton is caused by complete central nervous system
demyelination, whereas Myasthenia Gravis affects peripheral
sensory nerves.
• C. Lambert-Eaton symptoms worsen with repeated muscle use,
while Myasthenia Gravis strength improves with use.
• D. Lambert-Eaton is caused by a genetic point mutation in
mitochondrial DNA, while Myasthenia Gravis is purely viral.
Correct Answer: A. Lambert-Eaton involves autoantibodies targeting
presynaptic voltage-gated calcium channels (reducing acetylcholine
release), whereas Myasthenia Gravis targets postsynaptic acetylcholine
receptors.
Detailed Rationale: In Lambert-Eaton syndrome, autoantibodies attack
presynaptic calcium channels at the neuromuscular junction, impairing
acetylcholine exocytosis. Clinically, muscle strength often improves
temporarily with repetitive use as calcium accumulates, distinguishing it
from Myasthenia Gravis.
QUESTION 5
What is the classic clinical triad associated with Normal Pressure
Hydrocephalus (NPH)?
• A. Seizures, visual loss, and severe headache
• B. Gait disturbance, cognitive impairment (dementia), and urinary
incontinence
• C. Resting tremor, bradykinesia, and rigidity
