WGU D236 PATHOPHARMACOLOGY
COMPREHENSIVE EXAM REVIEW
QUESTIONS AND CORRECT ANSWERS
WITH DETAILED EXPLANATIONS
1. A patient with chronic kidney disease presents with a hemoglobin of 8.2 g/dL. Which
pathophysiological mechanism most likely accounts for this finding?
A. Premature destruction of red blood cells by the spleen
B. Insufficient production of erythropoietin by the kidneys
C. Chronic blood loss through the gastrointestinal tract
D. Iron deficiency due to impaired absorption in the duodenum
Answer: B
Conceptual Explanation: Erythropoietin is a hormone produced by the kidneys that
stimulates red blood cell production; its deficiency in chronic kidney disease leads to
anemia.
2. Which of the following ECG changes is most characteristic of a patient with a serum
potassium level of 6.8 mEq/L?
A. Tall, peaked T waves
B. Prominent U waves
,C. Shortened PR interval
D. ST-segment depression
Answer: A
Conceptual Explanation: Hyperkalemia (potassium > 5.0 mEq/L) causes characteristic
tall, peaked T waves due to faster repolarization of the myocardium.
3. A 55-year-old male is diagnosed with right-sided heart failure. Which clinical manifestation
should the nurse expect to observe?
A. Crackles and pulmonary congestion
B. Peripheral edema and jugular venous distention
C. Orthopnea and paroxysmal nocturnal dyspnea
D. Dry, hacking cough and hemoptysis
Answer: B
Conceptual Explanation: Right-sided heart failure causes blood to back up into the
systemic circulation, leading to peripheral edema, hepatomegaly, and jugular venous
distention.
4. Which hypersensitivity reaction is mediated by IgE antibodies and involves the release of
histamine from mast cells?
A. Type I Hypersensitivity
B. Type II Hypersensitivity
, C. Type III Hypersensitivity
D. Type IV Hypersensitivity
Answer: A
Conceptual Explanation: Type I hypersensitivity is an immediate allergic reaction
mediated by IgE binding to mast cells, triggering degranulation.
5. What is the primary underlying cause of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Excessive glucagon secretion by alpha cells
C. Decreased glucose absorption in the small intestine
D. Autoimmune destruction of pancreatic beta cells
Answer: D
Conceptual Explanation: Type 1 Diabetes Mellitus is characterized by the T-cell mediated
autoimmune destruction of the insulin-producing beta cells in the pancreas.
6. Which condition is characterized by the loss of the myelin sheath in the central nervous
system, leading to impaired nerve impulse conduction?
A. Amyotrophic Lateral Sclerosis (ALS)
B. Multiple Sclerosis (MS)
C. Parkinson’s Disease
COMPREHENSIVE EXAM REVIEW
QUESTIONS AND CORRECT ANSWERS
WITH DETAILED EXPLANATIONS
1. A patient with chronic kidney disease presents with a hemoglobin of 8.2 g/dL. Which
pathophysiological mechanism most likely accounts for this finding?
A. Premature destruction of red blood cells by the spleen
B. Insufficient production of erythropoietin by the kidneys
C. Chronic blood loss through the gastrointestinal tract
D. Iron deficiency due to impaired absorption in the duodenum
Answer: B
Conceptual Explanation: Erythropoietin is a hormone produced by the kidneys that
stimulates red blood cell production; its deficiency in chronic kidney disease leads to
anemia.
2. Which of the following ECG changes is most characteristic of a patient with a serum
potassium level of 6.8 mEq/L?
A. Tall, peaked T waves
B. Prominent U waves
,C. Shortened PR interval
D. ST-segment depression
Answer: A
Conceptual Explanation: Hyperkalemia (potassium > 5.0 mEq/L) causes characteristic
tall, peaked T waves due to faster repolarization of the myocardium.
3. A 55-year-old male is diagnosed with right-sided heart failure. Which clinical manifestation
should the nurse expect to observe?
A. Crackles and pulmonary congestion
B. Peripheral edema and jugular venous distention
C. Orthopnea and paroxysmal nocturnal dyspnea
D. Dry, hacking cough and hemoptysis
Answer: B
Conceptual Explanation: Right-sided heart failure causes blood to back up into the
systemic circulation, leading to peripheral edema, hepatomegaly, and jugular venous
distention.
4. Which hypersensitivity reaction is mediated by IgE antibodies and involves the release of
histamine from mast cells?
A. Type I Hypersensitivity
B. Type II Hypersensitivity
, C. Type III Hypersensitivity
D. Type IV Hypersensitivity
Answer: A
Conceptual Explanation: Type I hypersensitivity is an immediate allergic reaction
mediated by IgE binding to mast cells, triggering degranulation.
5. What is the primary underlying cause of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Excessive glucagon secretion by alpha cells
C. Decreased glucose absorption in the small intestine
D. Autoimmune destruction of pancreatic beta cells
Answer: D
Conceptual Explanation: Type 1 Diabetes Mellitus is characterized by the T-cell mediated
autoimmune destruction of the insulin-producing beta cells in the pancreas.
6. Which condition is characterized by the loss of the myelin sheath in the central nervous
system, leading to impaired nerve impulse conduction?
A. Amyotrophic Lateral Sclerosis (ALS)
B. Multiple Sclerosis (MS)
C. Parkinson’s Disease
