WGU D236 PATHOPHYSIOLOGY OBJECTIVE
ASSESSMENT (OA) EXAM PREP VERIFIED
QUESTIONS & ANSWERS GROUPED BY TOPIC
(LATEST 2026-2027)
Master your WGU D236 Pathophysiology Objective Assessment
with this comprehensive, premium bank of verified practice
questions and answers. Every question features a distinct four-
option multiple-choice layout accompanied by bold, deep-dive
italic rationales placed directly below the answer for instant
review. Perfect for self-assessment, this guide targets high-yield
topics including cellular adaptation, fluid imbalances, acid-base
vectors, systemic shock, and advanced clinical manifestations to
secure an A grade.
1. Cellular Adaptation & Injury
A client is diagnosed with myocardial infarction. Which
intracellular change occurs first due to lack of oxygen?
A) Rupture of lysosomes
B) Cellular swelling due to Na+/K+ pump failure
C) Lactic alkalosis
D) Decreased intracellular sodium
Answer: B) Cellular swelling due to Na+/K+ pump failure
Rationale: Hypoxia decreases ATP production, impairing the
energy-dependent sodium-potassium pump. Sodium enters
,the cell, pulling water with it and causing acute cellular
swelling.
2. Oncology Fundamentals
Which of the following is a characteristic of a malignant tumor
compared to a benign tumor?
A) Well-differentiated cells
B) Encapsulated growth border
C) High mitotic index and metastasis
D) Slow, predictable growth rate
Answer: C) High mitotic index and metastasis
Rationale: Malignant tumors are characterized by rapid,
uncontrolled growth (high mitotic index), lack of cellular
differentiation (anaplasia), and the ability to invade
surrounding tissues and metastasize to distant organs.
3. Fluid & Electrolytes
A patient presents with a serum potassium level of 6.2 mEq/L.
Which electrocardiogram (ECG) change is most expected?
A) Prominent U waves
B) Tall, peaked T waves
C) ST-segment depression
D) Prolonged QT interval
Answer: B) Tall, peaked T waves
Rationale: Hyperkalemia (potassium > 5.0 mEq/L) alters the
cardiac resting membrane potential and causes rapid
repolarization of cardiac myocytes, manifesting as tall,
peaked T waves on an ECG track.
4. A patient's arterial blood gas (ABG) results show: pH 7.28,
PaCO2 55 mmHg, and HCO3- 25 mEq/L. How should the
,nurse interpret these findings?
A) Compensated metabolic acidosis
B) Uncompensated respiratory acidosis
C) Fully compensated respiratory acidosis
D) Uncompensated metabolic alkalosis
Answer: B) Uncompensated respiratory acidosis
Rationale: The pH is below 7.35, indicating acidosis. The
PaCO2 is elevated above 45 mmHg, which points to a
respiratory cause. Because the HCO3- is within the normal
range (22–26 mEq/L), the kidneys have not yet compensated
for the respiratory failure.
5. Which mechanism explains the development of
generalized edema in a patient suffering from severe protein-
calorie malnutrition (kwashiorkor)?
A) Increased capillary hydrostatic pressure
B) Decreased plasma oncotic pressure
C) Increased interstitial fluid hydrostatic pressure
D) Lymphatic obstruction
Answer: B) Decreased plasma oncotic pressure
Rationale: Severe protein malnutrition limits the liver's ability
to synthesize albumin. Albumin is the primary driver of
plasma oncotic pressure, which pulls fluid back into the
vascular space. A lack of albumin allows fluid to escape into
the interstitial spaces, causing pitting edema.
6. A patient presents with a serum sodium level of 118 mEq/L.
Which pathophysiological consequence is the primary
concern for the clinician?
A) Intracellular dehydration and shrinkage of brain cells
B) Intracellular swelling and cerebral edema
, C) Increased extracellular fluid volume in the intravascular space
D) Excessive release of antidiuretic hormone from the posterior
pituitary
Answer: B) Intracellular swelling and cerebral edema
Rationale: Severe hyponatremia renders the extracellular fluid
hypotonic compared to the intracellular environment. Water
moves down its osmotic gradient into the cells, causing
rapid cellular swelling. In the rigid skull, this leads to cerebral
edema, altered mental status, and seizures.
7. Which clinical manifestation is most characteristic of
hypocalcemia?
A) Muscle flaccidity and diminished deep tendon reflexes
B) Constipation and renal calculi formation
C) Positive Trousseau and Chvostek signs
D) Shortened QT interval on an electrocardiogram
Answer: C) Positive Trousseau and Chvostek signs
Rationale: Hypocalcemia increases neuromuscular
excitability because low extracellular calcium levels lower
the threshold for nerve axon depolarization. This manifests
as muscle twitching, cramping, and positive Trousseau
(carpal spasm) or Chvostek (facial twitch) signs.
8. A patient presents with a pH of 7.52, a PaCO2 of 40 mmHg,
and an HCO3- of 32 mEq/L. What is the primary acid-base
disorder?
A) Acute respiratory alkalosis
B) Uncompensated metabolic alkalosis
C) Fully compensated metabolic acidosis
D) Combined respiratory and metabolic acidosis
Answer: B) Uncompensated metabolic alkalosis
ASSESSMENT (OA) EXAM PREP VERIFIED
QUESTIONS & ANSWERS GROUPED BY TOPIC
(LATEST 2026-2027)
Master your WGU D236 Pathophysiology Objective Assessment
with this comprehensive, premium bank of verified practice
questions and answers. Every question features a distinct four-
option multiple-choice layout accompanied by bold, deep-dive
italic rationales placed directly below the answer for instant
review. Perfect for self-assessment, this guide targets high-yield
topics including cellular adaptation, fluid imbalances, acid-base
vectors, systemic shock, and advanced clinical manifestations to
secure an A grade.
1. Cellular Adaptation & Injury
A client is diagnosed with myocardial infarction. Which
intracellular change occurs first due to lack of oxygen?
A) Rupture of lysosomes
B) Cellular swelling due to Na+/K+ pump failure
C) Lactic alkalosis
D) Decreased intracellular sodium
Answer: B) Cellular swelling due to Na+/K+ pump failure
Rationale: Hypoxia decreases ATP production, impairing the
energy-dependent sodium-potassium pump. Sodium enters
,the cell, pulling water with it and causing acute cellular
swelling.
2. Oncology Fundamentals
Which of the following is a characteristic of a malignant tumor
compared to a benign tumor?
A) Well-differentiated cells
B) Encapsulated growth border
C) High mitotic index and metastasis
D) Slow, predictable growth rate
Answer: C) High mitotic index and metastasis
Rationale: Malignant tumors are characterized by rapid,
uncontrolled growth (high mitotic index), lack of cellular
differentiation (anaplasia), and the ability to invade
surrounding tissues and metastasize to distant organs.
3. Fluid & Electrolytes
A patient presents with a serum potassium level of 6.2 mEq/L.
Which electrocardiogram (ECG) change is most expected?
A) Prominent U waves
B) Tall, peaked T waves
C) ST-segment depression
D) Prolonged QT interval
Answer: B) Tall, peaked T waves
Rationale: Hyperkalemia (potassium > 5.0 mEq/L) alters the
cardiac resting membrane potential and causes rapid
repolarization of cardiac myocytes, manifesting as tall,
peaked T waves on an ECG track.
4. A patient's arterial blood gas (ABG) results show: pH 7.28,
PaCO2 55 mmHg, and HCO3- 25 mEq/L. How should the
,nurse interpret these findings?
A) Compensated metabolic acidosis
B) Uncompensated respiratory acidosis
C) Fully compensated respiratory acidosis
D) Uncompensated metabolic alkalosis
Answer: B) Uncompensated respiratory acidosis
Rationale: The pH is below 7.35, indicating acidosis. The
PaCO2 is elevated above 45 mmHg, which points to a
respiratory cause. Because the HCO3- is within the normal
range (22–26 mEq/L), the kidneys have not yet compensated
for the respiratory failure.
5. Which mechanism explains the development of
generalized edema in a patient suffering from severe protein-
calorie malnutrition (kwashiorkor)?
A) Increased capillary hydrostatic pressure
B) Decreased plasma oncotic pressure
C) Increased interstitial fluid hydrostatic pressure
D) Lymphatic obstruction
Answer: B) Decreased plasma oncotic pressure
Rationale: Severe protein malnutrition limits the liver's ability
to synthesize albumin. Albumin is the primary driver of
plasma oncotic pressure, which pulls fluid back into the
vascular space. A lack of albumin allows fluid to escape into
the interstitial spaces, causing pitting edema.
6. A patient presents with a serum sodium level of 118 mEq/L.
Which pathophysiological consequence is the primary
concern for the clinician?
A) Intracellular dehydration and shrinkage of brain cells
B) Intracellular swelling and cerebral edema
, C) Increased extracellular fluid volume in the intravascular space
D) Excessive release of antidiuretic hormone from the posterior
pituitary
Answer: B) Intracellular swelling and cerebral edema
Rationale: Severe hyponatremia renders the extracellular fluid
hypotonic compared to the intracellular environment. Water
moves down its osmotic gradient into the cells, causing
rapid cellular swelling. In the rigid skull, this leads to cerebral
edema, altered mental status, and seizures.
7. Which clinical manifestation is most characteristic of
hypocalcemia?
A) Muscle flaccidity and diminished deep tendon reflexes
B) Constipation and renal calculi formation
C) Positive Trousseau and Chvostek signs
D) Shortened QT interval on an electrocardiogram
Answer: C) Positive Trousseau and Chvostek signs
Rationale: Hypocalcemia increases neuromuscular
excitability because low extracellular calcium levels lower
the threshold for nerve axon depolarization. This manifests
as muscle twitching, cramping, and positive Trousseau
(carpal spasm) or Chvostek (facial twitch) signs.
8. A patient presents with a pH of 7.52, a PaCO2 of 40 mmHg,
and an HCO3- of 32 mEq/L. What is the primary acid-base
disorder?
A) Acute respiratory alkalosis
B) Uncompensated metabolic alkalosis
C) Fully compensated metabolic acidosis
D) Combined respiratory and metabolic acidosis
Answer: B) Uncompensated metabolic alkalosis
