WGU D115 OA Advanced
Pathophysiology Exam 2025/2026 |
Actual Exam Questions with
Detailed Answers and Rationales
Introduction
This document includes real, verified exam questions from the WGU D115 OA Advanced
Pathophysiology course, updated for the 2025/2026 academic year. Reflecting the current
curriculum and exam structure, each question is followed by the correct answer in bold
green font, accompanied by a clear and concise rationale to support advanced clinical
understanding. This resource is designed for nursing students to master pathophysiology
concepts and excel in their assessments.
Exam Questions and Rationales
1. [Cellular Adaptation & Injury] What is the primary cause of cellular swelling
in hypoxic injury?
A. Oxidative phosphorylation
B. Failure of the sodium-potassium pump
C. Lysosomal enzyme release
D. Mitochondrial calcium overload
Rationale: Hypoxia reduces ATP, impairing the sodium-potassium pump, causing
sodium influx and cellular swelling.
2. [Inflammation and Immune Disorders] What is the hallmark of systemic lupus
erythematosus (SLE)?
A. Autoantibody production against nuclear antigens
B. Elevated C-reactive protein
C. Monoclonal gammopathy
D. Neutrophil extracellular traps
Rationale: SLE involves autoantibodies, especially anti-nuclear antibodies, targeting
self-antigens, leading to tissue damage.
3. [Cardiopulmonary & Neuro Conditions] Which condition results from insuf-
ficient antidiuretic hormone (ADH)?
A. Syndrome of inappropriate ADH
B. Diabetes insipidus
C. Cushing’s syndrome
WGU D115 OA Advanced Pathophysiology | Actual Exam Q&A with Rationales |
2025/2026
, D. Hyperaldosteronism
Rationale: ADH deficiency in diabetes insipidus causes excessive water loss and hyper-
natremia.
4. [Renal, Endocrine, GI, and Cancer Pathophysiology] What is the primary
cause of left-sided heart failure?
A. Pulmonary hypertension
B. Increased systemic vascular resistance
C. Right ventricular hypertrophy
D. Chronic obstructive pulmonary disease
Rationale: Increased systemic vascular resistance (e.g., hypertension) overworks the left
ventricle, causing failure.
5. [Renal, Endocrine, GI, and Cancer Pathophysiology] Which electrolyte im-
balance is most common in acute kidney injury (AKI)?
A. Hypokalemia
B. Hyperkalemia
C. Hyponatremia
D. Hypocalcemia
Rationale: AKI impairs potassium excretion, leading to hyperkalemia, which risks car-
diac arrhythmias.
6. [Renal, Endocrine, GI, and Cancer Pathophysiology] What is the role of
the BRCA1 gene in breast cancer?
A. Oncogene activation
B. Tumor suppressor gene
C. Angiogenesis promotion
D. Apoptosis inhibition
Rationale: BRCA1, a tumor suppressor, repairs DNA; mutations increase breast cancer
risk.
7. [Cellular Adaptation & Injury] What triggers histamine release during inflam-
mation?
A. Mast cell degranulation
B. Neutrophil phagocytosis
C. Complement activation
D. Cytokine suppression
Rationale: Mast cells degranulate in response to injury or allergens, releasing histamine
for vasodilation.
WGU D115 OA Advanced Pathophysiology | Actual Exam Q&A with Rationales |
2025/2026
, 8. [Inflammation and Immune Disorders] Which cytokine drives rheumatoid
arthritis progression?
A. IL-10
B. TNF-alpha
C. IL-4
D. TGF-beta
Rationale: TNF-alpha promotes inflammation and joint destruction in rheumatoid
arthritis.
9. [Cardiopulmonary & Neuro Conditions] What is the primary pathophysio-
logical feature of Parkinson’s disease?
A. Dopamine depletion in the substantia nigra
B. Amyloid plaque formation
C. Myelin sheath destruction
D. Glutamate excitotoxicity
Rationale: Dopaminergic neuron loss in the substantia nigra reduces dopamine, causing
motor symptoms.
10. [Cardiopulmonary & Neuro Conditions] What causes pulmonary edema in
congestive heart failure?
A. Increased pulmonary capillary pressure
B. Decreased surfactant production
C. Bronchial constriction
D. Alveolar macrophage activation
Rationale: Left heart failure elevates pulmonary capillary pressure, forcing fluid into
alveoli.
11. [Renal, Endocrine, GI, and Cancer Pathophysiology] What is the primary
mechanism of hepatic encephalopathy in cirrhosis?
A. Ammonia accumulation in the brain
B. Bile acid deficiency
C. Hypoglycemia
D. Portal vein thrombosis
Rationale: Cirrhosis impairs ammonia detoxification, causing brain dysfunction.
12. [Renal, Endocrine, GI, and Cancer Pathophysiology] Which genetic muta-
tion is associated with chronic myelogenous leukemia (CML)?
A. Philadelphia chromosome
B. BRCA2 mutation
WGU D115 OA Advanced Pathophysiology | Actual Exam Q&A with Rationales |
2025/2026
Pathophysiology Exam 2025/2026 |
Actual Exam Questions with
Detailed Answers and Rationales
Introduction
This document includes real, verified exam questions from the WGU D115 OA Advanced
Pathophysiology course, updated for the 2025/2026 academic year. Reflecting the current
curriculum and exam structure, each question is followed by the correct answer in bold
green font, accompanied by a clear and concise rationale to support advanced clinical
understanding. This resource is designed for nursing students to master pathophysiology
concepts and excel in their assessments.
Exam Questions and Rationales
1. [Cellular Adaptation & Injury] What is the primary cause of cellular swelling
in hypoxic injury?
A. Oxidative phosphorylation
B. Failure of the sodium-potassium pump
C. Lysosomal enzyme release
D. Mitochondrial calcium overload
Rationale: Hypoxia reduces ATP, impairing the sodium-potassium pump, causing
sodium influx and cellular swelling.
2. [Inflammation and Immune Disorders] What is the hallmark of systemic lupus
erythematosus (SLE)?
A. Autoantibody production against nuclear antigens
B. Elevated C-reactive protein
C. Monoclonal gammopathy
D. Neutrophil extracellular traps
Rationale: SLE involves autoantibodies, especially anti-nuclear antibodies, targeting
self-antigens, leading to tissue damage.
3. [Cardiopulmonary & Neuro Conditions] Which condition results from insuf-
ficient antidiuretic hormone (ADH)?
A. Syndrome of inappropriate ADH
B. Diabetes insipidus
C. Cushing’s syndrome
WGU D115 OA Advanced Pathophysiology | Actual Exam Q&A with Rationales |
2025/2026
, D. Hyperaldosteronism
Rationale: ADH deficiency in diabetes insipidus causes excessive water loss and hyper-
natremia.
4. [Renal, Endocrine, GI, and Cancer Pathophysiology] What is the primary
cause of left-sided heart failure?
A. Pulmonary hypertension
B. Increased systemic vascular resistance
C. Right ventricular hypertrophy
D. Chronic obstructive pulmonary disease
Rationale: Increased systemic vascular resistance (e.g., hypertension) overworks the left
ventricle, causing failure.
5. [Renal, Endocrine, GI, and Cancer Pathophysiology] Which electrolyte im-
balance is most common in acute kidney injury (AKI)?
A. Hypokalemia
B. Hyperkalemia
C. Hyponatremia
D. Hypocalcemia
Rationale: AKI impairs potassium excretion, leading to hyperkalemia, which risks car-
diac arrhythmias.
6. [Renal, Endocrine, GI, and Cancer Pathophysiology] What is the role of
the BRCA1 gene in breast cancer?
A. Oncogene activation
B. Tumor suppressor gene
C. Angiogenesis promotion
D. Apoptosis inhibition
Rationale: BRCA1, a tumor suppressor, repairs DNA; mutations increase breast cancer
risk.
7. [Cellular Adaptation & Injury] What triggers histamine release during inflam-
mation?
A. Mast cell degranulation
B. Neutrophil phagocytosis
C. Complement activation
D. Cytokine suppression
Rationale: Mast cells degranulate in response to injury or allergens, releasing histamine
for vasodilation.
WGU D115 OA Advanced Pathophysiology | Actual Exam Q&A with Rationales |
2025/2026
, 8. [Inflammation and Immune Disorders] Which cytokine drives rheumatoid
arthritis progression?
A. IL-10
B. TNF-alpha
C. IL-4
D. TGF-beta
Rationale: TNF-alpha promotes inflammation and joint destruction in rheumatoid
arthritis.
9. [Cardiopulmonary & Neuro Conditions] What is the primary pathophysio-
logical feature of Parkinson’s disease?
A. Dopamine depletion in the substantia nigra
B. Amyloid plaque formation
C. Myelin sheath destruction
D. Glutamate excitotoxicity
Rationale: Dopaminergic neuron loss in the substantia nigra reduces dopamine, causing
motor symptoms.
10. [Cardiopulmonary & Neuro Conditions] What causes pulmonary edema in
congestive heart failure?
A. Increased pulmonary capillary pressure
B. Decreased surfactant production
C. Bronchial constriction
D. Alveolar macrophage activation
Rationale: Left heart failure elevates pulmonary capillary pressure, forcing fluid into
alveoli.
11. [Renal, Endocrine, GI, and Cancer Pathophysiology] What is the primary
mechanism of hepatic encephalopathy in cirrhosis?
A. Ammonia accumulation in the brain
B. Bile acid deficiency
C. Hypoglycemia
D. Portal vein thrombosis
Rationale: Cirrhosis impairs ammonia detoxification, causing brain dysfunction.
12. [Renal, Endocrine, GI, and Cancer Pathophysiology] Which genetic muta-
tion is associated with chronic myelogenous leukemia (CML)?
A. Philadelphia chromosome
B. BRCA2 mutation
WGU D115 OA Advanced Pathophysiology | Actual Exam Q&A with Rationales |
2025/2026
