WGU D236 Pathophysiology
Objective Assessment|| Complete
Exam-Style Questions & Answers
Test Bank (300 Questions with
Detailed Rationales)
1. Cellular Adaptation and Injury
A patient with chronic lung disease has a bronchial lining that has
changed from pseudostratified ciliated columnar epithelium to stratified
squamous epithelium. This process is best described as:
A. Hyperplasia
B. Metaplasia
C. Dysplasia
D. Anaplasia
Answer: B. Metaplasia
Rationale: Metaplasia is the reversible replacement of one mature cell
type by another, often less differentiated, cell type. This is a common
adaptive response to chronic irritation, such as from cigarette smoke .
2. Fluid and Electrolyte Imbalance
A patient presents with muscle spasms and a positive Chvostek sign.
Which electrolyte imbalance is most likely the cause?
A. Hyperkalemia
B. Hypercalcemia
C. Hypocalcemia
D. Hyponatremia
Answer: C. Hypocalcemia
Rationale: Hypocalcemia increases neuromuscular excitability, leading to
muscle twitching and spasms. Chvostek sign (twitching of facial muscles
when tapping the facial nerve) and Trousseau sign (carpal spasm when
inflating a blood pressure cuff) are classic clinical indicators of
hypocalcemia .
,3. Respiratory Pathophysiology
A patient with COPD is experiencing hypoventilation. Which acid-base
imbalance is expected?
A. Respiratory alkalosis
B. Metabolic alkalosis
C. Respiratory acidosis
D. Metabolic acidosis
Answer: C. Respiratory acidosis
Rationale: Hypoventilation leads to an accumulation of carbon dioxide
(CO2) in the blood. This retained CO2 forms carbonic acid, decreasing
blood pH and resulting in respiratory acidosis .
4. Cardiovascular Pathophysiology
A patient with left-sided heart failure is most likely to present with which
primary symptom?
A. Peripheral edema
B. Jugular venous distention
C. Pulmonary crackles
D. Hepatosplenomegaly
Answer: C. Pulmonary crackles
Rationale: Left-sided heart failure impairs the left ventricle's ability to
pump blood forward, causing blood to back up into the pulmonary
circulation. This leads to pulmonary congestion and edema, which is
clinically manifested as crackles (rales) on lung auscultation .
5. Endocrine Pathophysiology
A patient's lab results show elevated serum calcium and low serum
phosphate. Which of the following is the most likely underlying
mechanism?
A. Increased renal reabsorption of calcium due to primary
hyperparathyroidism
B. Increased intestinal absorption of calcium due to vitamin D
intoxication
C. Decreased renal excretion of calcium due to thiazide diuretic use
D. Increased bone resorption due to malignancy-associated
hypercalcemia
Answer: A. Increased renal reabsorption of calcium due to primary
hyperparathyroidism
,Rationale: Primary hyperparathyroidism is characterized by elevated
parathyroid hormone (PTH), which increases bone resorption and renal
calcium reabsorption while promoting phosphate excretion. This results
in the classic lab finding of hypercalcemia and hypophosphatemia
🔬 Cellular Adaptation, Injury, & Neoplasia
6. A patient with chronic anemia develops an enlarged heart. This
represents which type of cellular adaptation?
A. Atrophy
B. Hypertrophy
C. Hyperplasia
D. Metaplasia
Answer: B. Hypertrophy
Rationale: Hypertrophy is an increase in cell size, which increases the
overall organ size. The heart muscle cells enlarge in response to an
increased workload, such as pumping against low oxygen levels in
chronic anemia.
7. A pathologist notes that the columnar epithelium of a smoker's
bronchus has been replaced by stratified squamous epithelium. This
change is best described as:
A. Dysplasia
B. Metaplasia
C. Hyperplasia
D. Anaplasia
Answer: B. Metaplasia
Rationale: Metaplasia is a reversible change where one mature cell type
is replaced by another, often less specialized, cell type. This is a common
adaptive response to chronic irritation, such as from cigarette smoke.
8. Which statement best differentiates benign from malignant
tumors?
A. Benign tumors are always encapsulated; malignant tumors are never
encapsulated.
B. Benign tumors grow by expansion and do not metastasize; malignant
tumors invade and metastasize.
C. Benign tumors are composed of poorly differentiated cells; malignant
, tumors are well-differentiated.
D. Benign tumors always recur after removal; malignant tumors rarely
recur.
Answer: B. Benign tumors grow by expansion and do not
metastasize; malignant tumors invade and metastasize.
Rationale: The key distinguishing feature is that benign tumors remain
localized and do not spread to distant sites, while malignant tumors are
invasive and can metastasize.
9. A tumor suppressor gene that is mutated in many human cancers
and is known as the "guardian of the genome" is:
A. RAS
B. MYC
C. TP53
D. HER2
Answer: C. TP53
Rationale: The TP53 gene (which produces the p53 protein) plays a
critical role in regulating the cell cycle and preventing mutations. It can
halt the cell cycle for DNA repair or trigger apoptosis if damage is
irreparable. Mutations in TP53 are found in over 50% of human cancers.
⚖️ Fluid, Electrolyte, and Acid-Base Imbalances
10. A patient with heart failure presents with pitting edema in the
lower extremities, jugular venous distention, and crackles in the
lungs. The underlying mechanism for these findings is:
A. Decreased plasma oncotic pressure
B. Increased capillary hydrostatic pressure
C. Lymphatic obstruction
D. Increased capillary permeability
Answer: B. Increased capillary hydrostatic pressure
Rationale: In heart failure, the heart cannot pump effectively, leading to
increased venous pressure and a backup of blood. This raises capillary
hydrostatic pressure, forcing fluid out of the capillaries and into the
interstitial spaces, resulting in edema.
11. What is one cause of edema?
A. Increased plasma oncotic pressure
Objective Assessment|| Complete
Exam-Style Questions & Answers
Test Bank (300 Questions with
Detailed Rationales)
1. Cellular Adaptation and Injury
A patient with chronic lung disease has a bronchial lining that has
changed from pseudostratified ciliated columnar epithelium to stratified
squamous epithelium. This process is best described as:
A. Hyperplasia
B. Metaplasia
C. Dysplasia
D. Anaplasia
Answer: B. Metaplasia
Rationale: Metaplasia is the reversible replacement of one mature cell
type by another, often less differentiated, cell type. This is a common
adaptive response to chronic irritation, such as from cigarette smoke .
2. Fluid and Electrolyte Imbalance
A patient presents with muscle spasms and a positive Chvostek sign.
Which electrolyte imbalance is most likely the cause?
A. Hyperkalemia
B. Hypercalcemia
C. Hypocalcemia
D. Hyponatremia
Answer: C. Hypocalcemia
Rationale: Hypocalcemia increases neuromuscular excitability, leading to
muscle twitching and spasms. Chvostek sign (twitching of facial muscles
when tapping the facial nerve) and Trousseau sign (carpal spasm when
inflating a blood pressure cuff) are classic clinical indicators of
hypocalcemia .
,3. Respiratory Pathophysiology
A patient with COPD is experiencing hypoventilation. Which acid-base
imbalance is expected?
A. Respiratory alkalosis
B. Metabolic alkalosis
C. Respiratory acidosis
D. Metabolic acidosis
Answer: C. Respiratory acidosis
Rationale: Hypoventilation leads to an accumulation of carbon dioxide
(CO2) in the blood. This retained CO2 forms carbonic acid, decreasing
blood pH and resulting in respiratory acidosis .
4. Cardiovascular Pathophysiology
A patient with left-sided heart failure is most likely to present with which
primary symptom?
A. Peripheral edema
B. Jugular venous distention
C. Pulmonary crackles
D. Hepatosplenomegaly
Answer: C. Pulmonary crackles
Rationale: Left-sided heart failure impairs the left ventricle's ability to
pump blood forward, causing blood to back up into the pulmonary
circulation. This leads to pulmonary congestion and edema, which is
clinically manifested as crackles (rales) on lung auscultation .
5. Endocrine Pathophysiology
A patient's lab results show elevated serum calcium and low serum
phosphate. Which of the following is the most likely underlying
mechanism?
A. Increased renal reabsorption of calcium due to primary
hyperparathyroidism
B. Increased intestinal absorption of calcium due to vitamin D
intoxication
C. Decreased renal excretion of calcium due to thiazide diuretic use
D. Increased bone resorption due to malignancy-associated
hypercalcemia
Answer: A. Increased renal reabsorption of calcium due to primary
hyperparathyroidism
,Rationale: Primary hyperparathyroidism is characterized by elevated
parathyroid hormone (PTH), which increases bone resorption and renal
calcium reabsorption while promoting phosphate excretion. This results
in the classic lab finding of hypercalcemia and hypophosphatemia
🔬 Cellular Adaptation, Injury, & Neoplasia
6. A patient with chronic anemia develops an enlarged heart. This
represents which type of cellular adaptation?
A. Atrophy
B. Hypertrophy
C. Hyperplasia
D. Metaplasia
Answer: B. Hypertrophy
Rationale: Hypertrophy is an increase in cell size, which increases the
overall organ size. The heart muscle cells enlarge in response to an
increased workload, such as pumping against low oxygen levels in
chronic anemia.
7. A pathologist notes that the columnar epithelium of a smoker's
bronchus has been replaced by stratified squamous epithelium. This
change is best described as:
A. Dysplasia
B. Metaplasia
C. Hyperplasia
D. Anaplasia
Answer: B. Metaplasia
Rationale: Metaplasia is a reversible change where one mature cell type
is replaced by another, often less specialized, cell type. This is a common
adaptive response to chronic irritation, such as from cigarette smoke.
8. Which statement best differentiates benign from malignant
tumors?
A. Benign tumors are always encapsulated; malignant tumors are never
encapsulated.
B. Benign tumors grow by expansion and do not metastasize; malignant
tumors invade and metastasize.
C. Benign tumors are composed of poorly differentiated cells; malignant
, tumors are well-differentiated.
D. Benign tumors always recur after removal; malignant tumors rarely
recur.
Answer: B. Benign tumors grow by expansion and do not
metastasize; malignant tumors invade and metastasize.
Rationale: The key distinguishing feature is that benign tumors remain
localized and do not spread to distant sites, while malignant tumors are
invasive and can metastasize.
9. A tumor suppressor gene that is mutated in many human cancers
and is known as the "guardian of the genome" is:
A. RAS
B. MYC
C. TP53
D. HER2
Answer: C. TP53
Rationale: The TP53 gene (which produces the p53 protein) plays a
critical role in regulating the cell cycle and preventing mutations. It can
halt the cell cycle for DNA repair or trigger apoptosis if damage is
irreparable. Mutations in TP53 are found in over 50% of human cancers.
⚖️ Fluid, Electrolyte, and Acid-Base Imbalances
10. A patient with heart failure presents with pitting edema in the
lower extremities, jugular venous distention, and crackles in the
lungs. The underlying mechanism for these findings is:
A. Decreased plasma oncotic pressure
B. Increased capillary hydrostatic pressure
C. Lymphatic obstruction
D. Increased capillary permeability
Answer: B. Increased capillary hydrostatic pressure
Rationale: In heart failure, the heart cannot pump effectively, leading to
increased venous pressure and a backup of blood. This raises capillary
hydrostatic pressure, forcing fluid out of the capillaries and into the
interstitial spaces, resulting in edema.
11. What is one cause of edema?
A. Increased plasma oncotic pressure
