WGU D236 Pathophysiology Objective Assessment: Comprehensive Exam Questions with Verified Answers and Detailed Rationales (New Version – Updated March 2026)

WGU D236 Pathophysiology
Objective Assessment: Comprehensive
Exam Questions with Verified Answers
and Detailed Rationales (New Version
– Updated March 2026)
Section 1: Cellular Adaptation, Injury, and Death (Questions 1-10)

Question 1
A 55-year-old male with a 30-year history of smoking is examined for
respiratory disturbance. Examination of his bronchial airway reveals that
stratified squamous epithelial cells have replaced the normal columnar
ciliated cells. This type of cellular adaptation is called:

 A) Hyperplasia
 B) Dysplasia
 C) Metaplasia
 D) Anaplasia

Answer: C) Metaplasia
Rationale: Metaplasia is the reversible replacement of one differentiated cell
type with another. In smokers, the normal pseudostratified ciliated
columnar epithelium of the bronchi is replaced by stratified squamous
epithelium as a protective adaptation to chronic irritation.

,Question 2
A patient experiencing prolonged myocardial ischemia develops irreversible
cellular injury after severe ATP depletion and intracellular calcium
accumulation. Which pathophysiologic process most directly causes cellular
destruction?

 A) Increased sodium-potassium pump activity
 B) Activation of destructive intracellular enzymes
 C) Enhanced mitochondrial energy production
 D) Increased cellular membrane stability

Answer: B) Activation of destructive intracellular enzymes
Rationale: Calcium accumulation activates destructive intracellular enzymes
(proteases, phospholipases, endonucleases) that cause irreversible cell
damage. ATP depletion impairs the sodium-potassium pump, but it is the
activation of these enzymes that directly causes cellular destruction.




Question 3
A patient with chronic kidney disease develops anemia. What is the most
likely pathophysiological mechanism for this anemia?

 A) Iron deficiency due to poor dietary intake
 B) Increased destruction of red blood cells
 C) Decreased production of erythropoietin
 D) Folate deficiency from malabsorption

Answer: C) Decreased production of erythropoietin
Rationale: The kidneys produce erythropoietin (EPO), a hormone that
stimulates red blood cell production in the bone marrow. In chronic kidney

,disease, damaged kidneys cannot produce sufficient EPO, leading to
normocytic, normochromic anemia.




Question 4
If a patient develops acidosis, the nurse would expect the oxyhemoglobin
dissociation curve to react in which manner?

 A) Shift to the right, causing more oxygen to be released to the cells
 B) Shift to the left, allowing less oxygen to be released to the cells
 C) Show no change
 D) Show variable fluctuation

Answer: A) Shift to the right, causing more oxygen to be released to
the cells
Rationale: Acidosis (decreased pH) causes the oxyhemoglobin dissociation
curve to shift to the right (Bohr effect). This decreases hemoglobin's affinity
for oxygen, promoting oxygen release to tissues as a compensatory
mechanism during metabolic stress.




Question 5
Which type of cellular adaptation involves an increase in the size of cells?

 A) Hyperplasia
 B) Hypertrophy
 C) Atrophy
 D) Metaplasia

, Answer: B) Hypertrophy
Rationale: Hypertrophy is an increase in cell size, whereas hyperplasia is an
increase in cell number. Atrophy is a decrease in cell size, and metaplasia is
the replacement of one cell type with another.




Question 6
Untreated acidosis leads to an increase in which electrolyte?

 A) Sodium
 B) Calcium
 C) Potassium
 D) Magnesium

Answer: C) Potassium
Rationale: Acidosis causes hydrogen ions to move into cells, and potassium
moves out of cells to maintain electrical neutrality. This results in
hyperkalemia (increased serum potassium).




Question 7
A patient has prolonged ischemia to cardiac tissue. What is the most likely
outcome?

 A) Apoptosis
 B) Necrosis
 C) Metaplasia
 D) Hyperplasia