WGU D236 PATHOPHYSIOLOGY
COMPREHENSIVE OA EXAM PREP
(HIGH DIFFICULTY) QUESTIONS AND
ANSWERS
1. A patient with long-standing hypertension presents with an enlarged left ventricle on an
echocardiogram. Which cellular adaptation is occurring in the myocardial cells?
A. Hyperplasia
B. Metaplasia
C. Hypertrophy
D. Atrophy
Answer: C
Conceptual Explanation: Hypertrophy is an increase in the size of cells, resulting in an
increase in the size of the organ. In the heart, this occurs in response to increased
workload, such as hypertension, because cardiac muscle cells cannot divide (hyperplasia).
2. Which electrolyte imbalance is most commonly associated with the development of
Trousseau and Chvostek signs?
A. Hyperkalemia
,B. Hyponatremia
C. Hypocalcemia
D. Hypomagnesemia
Answer: C
Conceptual Explanation: Hypocalcemia increases neuromuscular excitability. Trousseau
sign (carpal spasm) and Chvostek sign (facial twitching) are clinical indicators of low
serum calcium levels.
3. A patient presents with arterial blood gas (ABG) results: pH 7.28, PaCO2 55 mmHg, and
HCO3 26 mEq/L. What is the correct interpretation?
A. Metabolic Acidosis
B. Respiratory Alkalosis
C. Respiratory Acidosis
D. Metabolic Alkalosis
Answer: C
Conceptual Explanation: A pH below 7.35 indicates acidosis. A PaCO2 above 45 mmHg
indicates a respiratory cause for the acidosis. Since the HCO3 is within the normal range, it
is uncompensated respiratory acidosis.
, 4. In the pathophysiology of Type 1 Diabetes Mellitus, which mechanism is primarily
responsible for the destruction of pancreatic beta cells?
A. Insulin resistance in peripheral tissues
B. Amyloid deposition in the Islets of Langerhans
C. T-cell mediated autoimmune destruction
D. Excessive glucagon secretion by alpha cells
Answer: C
Conceptual Explanation: Type 1 Diabetes is characterized by an autoimmune process
where T-lymphocytes attack and destroy insulin-producing beta cells in the pancreas,
leading to absolute insulin deficiency.
5. Which type of hypersensitivity reaction involves the binding of IgE to mast cells and the
subsequent release of histamine?
A. Type II (Cytotoxic)
B. Type I (Immediate)
C. Type III (Immune Complex)
D. Type IV (Delayed)
Answer: B
Conceptual Explanation: Type I hypersensitivity is IgE-mediated. Allergens bind to IgE on
mast cells, causing degranulation and the release of inflammatory mediators like histamine.
COMPREHENSIVE OA EXAM PREP
(HIGH DIFFICULTY) QUESTIONS AND
ANSWERS
1. A patient with long-standing hypertension presents with an enlarged left ventricle on an
echocardiogram. Which cellular adaptation is occurring in the myocardial cells?
A. Hyperplasia
B. Metaplasia
C. Hypertrophy
D. Atrophy
Answer: C
Conceptual Explanation: Hypertrophy is an increase in the size of cells, resulting in an
increase in the size of the organ. In the heart, this occurs in response to increased
workload, such as hypertension, because cardiac muscle cells cannot divide (hyperplasia).
2. Which electrolyte imbalance is most commonly associated with the development of
Trousseau and Chvostek signs?
A. Hyperkalemia
,B. Hyponatremia
C. Hypocalcemia
D. Hypomagnesemia
Answer: C
Conceptual Explanation: Hypocalcemia increases neuromuscular excitability. Trousseau
sign (carpal spasm) and Chvostek sign (facial twitching) are clinical indicators of low
serum calcium levels.
3. A patient presents with arterial blood gas (ABG) results: pH 7.28, PaCO2 55 mmHg, and
HCO3 26 mEq/L. What is the correct interpretation?
A. Metabolic Acidosis
B. Respiratory Alkalosis
C. Respiratory Acidosis
D. Metabolic Alkalosis
Answer: C
Conceptual Explanation: A pH below 7.35 indicates acidosis. A PaCO2 above 45 mmHg
indicates a respiratory cause for the acidosis. Since the HCO3 is within the normal range, it
is uncompensated respiratory acidosis.
, 4. In the pathophysiology of Type 1 Diabetes Mellitus, which mechanism is primarily
responsible for the destruction of pancreatic beta cells?
A. Insulin resistance in peripheral tissues
B. Amyloid deposition in the Islets of Langerhans
C. T-cell mediated autoimmune destruction
D. Excessive glucagon secretion by alpha cells
Answer: C
Conceptual Explanation: Type 1 Diabetes is characterized by an autoimmune process
where T-lymphocytes attack and destroy insulin-producing beta cells in the pancreas,
leading to absolute insulin deficiency.
5. Which type of hypersensitivity reaction involves the binding of IgE to mast cells and the
subsequent release of histamine?
A. Type II (Cytotoxic)
B. Type I (Immediate)
C. Type III (Immune Complex)
D. Type IV (Delayed)
Answer: B
Conceptual Explanation: Type I hypersensitivity is IgE-mediated. Allergens bind to IgE on
mast cells, causing degranulation and the release of inflammatory mediators like histamine.
