WGU D236 PATHOPHYSIOLOGY
MIDTERM COMPREHENSIVE EXAM
QUESTIONS AND CORRECT ANSWERS
WITH DETAILED EXPLANATIONS
1. A patient exhibits a decrease in muscle mass in their right leg after being in a cast for six
weeks. This cellular adaptation is best described as:
A. Atrophy
B. Hypertrophy
C. Metaplasia
D. Dysplasia
Answer: A
Conceptual Explanation: Atrophy is the decrease or shrinkage in cellular size, often
caused by disuse, denervation, or decreased blood flow.
2. Which mechanism is primarily responsible for the cellular injury observed in ischemia-
reperfusion injury?
A. Decreased intracellular calcium
B. Increased ATP production
C. Intracellular alkalosis
,D. Oxidative stress and reactive oxygen species
Answer: D
Conceptual Explanation: Reperfusion injury is caused by the restoration of oxygen, which
leads to the generation of highly reactive oxygen intermediates (free radicals) that damage
cell membranes.
3. In a patient with Chronic Obstructive Pulmonary Disease (COPD), the body compensates
for chronic respiratory acidosis by:
A. Increasing renal reabsorption of bicarbonate
B. Excreting bicarbonate in the urine
C. Decreasing the respiratory rate
D. Retaining hydrogen ions in the kidneys
Answer: A
Conceptual Explanation: To compensate for respiratory acidosis (high CO2), the kidneys
retain bicarbonate (HCO3-) and excrete hydrogen ions to normalize the pH.
4. A 25-year-old male presents with high fever, neck stiffness, and a positive Brudzinski sign.
Which of the following is the most likely pathophysiological process?
A. Neuronal death in the cerebral cortex
B. Degeneration of the basal ganglia
C. Demyelination of the central nervous system
, D. Inflammation of the meninges
Answer: D
Conceptual Explanation: Meningitis involves inflammation of the protective membranes
covering the brain and spinal cord, presenting with nuchal rigidity and fever.
5. Which electrolyte imbalance is most commonly associated with the development of a U-
wave on an EKG?
A. Hypokalemia
B. Hyperkalemia
C. Hypercalcemia
D. Hyponatremia
Answer: A
Conceptual Explanation: Hypokalemia (low potassium) typically manifests on an EKG as
flattened T-waves and the presence of U-waves.
6. A patient is diagnosed with a Type I Hypersensitivity reaction. Which antibody and cell type
are primarily involved?
A. IgG and Neutrophils
B. IgM and Macrophages
C. IgE and Mast cells
D. IgA and B-lymphocytes
MIDTERM COMPREHENSIVE EXAM
QUESTIONS AND CORRECT ANSWERS
WITH DETAILED EXPLANATIONS
1. A patient exhibits a decrease in muscle mass in their right leg after being in a cast for six
weeks. This cellular adaptation is best described as:
A. Atrophy
B. Hypertrophy
C. Metaplasia
D. Dysplasia
Answer: A
Conceptual Explanation: Atrophy is the decrease or shrinkage in cellular size, often
caused by disuse, denervation, or decreased blood flow.
2. Which mechanism is primarily responsible for the cellular injury observed in ischemia-
reperfusion injury?
A. Decreased intracellular calcium
B. Increased ATP production
C. Intracellular alkalosis
,D. Oxidative stress and reactive oxygen species
Answer: D
Conceptual Explanation: Reperfusion injury is caused by the restoration of oxygen, which
leads to the generation of highly reactive oxygen intermediates (free radicals) that damage
cell membranes.
3. In a patient with Chronic Obstructive Pulmonary Disease (COPD), the body compensates
for chronic respiratory acidosis by:
A. Increasing renal reabsorption of bicarbonate
B. Excreting bicarbonate in the urine
C. Decreasing the respiratory rate
D. Retaining hydrogen ions in the kidneys
Answer: A
Conceptual Explanation: To compensate for respiratory acidosis (high CO2), the kidneys
retain bicarbonate (HCO3-) and excrete hydrogen ions to normalize the pH.
4. A 25-year-old male presents with high fever, neck stiffness, and a positive Brudzinski sign.
Which of the following is the most likely pathophysiological process?
A. Neuronal death in the cerebral cortex
B. Degeneration of the basal ganglia
C. Demyelination of the central nervous system
, D. Inflammation of the meninges
Answer: D
Conceptual Explanation: Meningitis involves inflammation of the protective membranes
covering the brain and spinal cord, presenting with nuchal rigidity and fever.
5. Which electrolyte imbalance is most commonly associated with the development of a U-
wave on an EKG?
A. Hypokalemia
B. Hyperkalemia
C. Hypercalcemia
D. Hyponatremia
Answer: A
Conceptual Explanation: Hypokalemia (low potassium) typically manifests on an EKG as
flattened T-waves and the presence of U-waves.
6. A patient is diagnosed with a Type I Hypersensitivity reaction. Which antibody and cell type
are primarily involved?
A. IgG and Neutrophils
B. IgM and Macrophages
C. IgE and Mast cells
D. IgA and B-lymphocytes
