WGU D236 PATHOPHYSIOLOGY PRE-ASSESSMENT EXAM –
QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED
ANSWERS PLUS RATIONALES | GUARANTEED PASS | LATEST
EXAM UPDATE | EXAM PREP | STUDY GUIDE | PRACTICE
TEST| DOWNLOAD INSTANT PDF
1. A 45-year-old male presents to the clinic complaining of chronic, burning epigastric pain
that worsens on an empty stomach and is temporarily relieved by eating food or taking
antacids. Endoscopic evaluation confirms a peptic ulcer. Which of the following
microorganisms is most commonly associated with the pathogenesis of this condition?
A. Escherichia coli
B. Helicobacter pylori
C. Streptococcus pneumoniae
D. Clostridium difficile
Rationale: Helicobacter pylori is a spiral-shaped bacterium that colonizes the gastric mucosa,
producing urease and neutralizing gastric acid, which leads to mucosal inflammation,
epithelial cell damage, and ulcer formation. The other listed organisms are not primary
causative agents of peptic ulcer disease.
2. A 60-year-old female with a long-standing history of poorly controlled hypertension
presents with left ventricular hypertrophy. Which cellular adaptation mechanism is
primarily responsible for the thickening of the myocardial wall in response to chronic
hemodynamic overload?
A. Atrophy
B. Metaplasia
C. Hypertrophy
D. Dysplasia
Rationale: Hypertrophy is an increase in the size of cells resulting in an enlarged tissue mass,
which occurs in cardiac muscle cells facing increased workload such as systemic
hypertension. Atrophy is a decrease in cell size, metaplasia is the reversible replacement of one
mature cell type by another, and dysplasia represents disordered cellular growth.
3. A patient is evaluated in the emergency department following a severe motor vehicle
crash. Laboratory findings reveal profound metabolic acidosis with an elevated anion gap.
,Which of the following clinical scenarios is the most likely cause of an elevated anion gap
metabolic acidosis?
A. Severe diarrhea resulting in excessive bicarbonate loss
B. Lactic acidosis secondary to tissue hypoperfusion and shock
C. Renal tubular acidosis type 2
D. Administration of large volumes of normal saline solution
Rationale: Lactic acidosis leads to the accumulation of unmeasured organic anions, thereby
increasing the anion gap. Diarrhea, normal saline infusion, and renal tubular acidosis
typically cause normal anion gap (hyperchloremic) metabolic acidosis due to direct
bicarbonate loss or renal retention of chloride.
4. A 52-year-old male develops sudden, excruciating pain in his right great toe. Joint
aspiration reveals negatively birefringent needle-shaped crystals. Which of the following
biochemical abnormalities is the underlying cause of this condition?
A. Hypercalcemia
B. Hyperuricemia
C. Hypokalemia
D. Hyperglycemia
Rationale: Gout is caused by the precipitation of monosodium urate crystals in joints due to
hyperuricemia, resulting from overproduction or underexcretion of uric acid. Calcium,
potassium, and glucose imbalances do not cause urate crystal formation.
5. A 30-year-old female presents with fatigue, weight gain, constipation, and cold
intolerance. Laboratory tests show an elevated thyroid-stimulating hormone (TSH) level
and a decreased free thyroxine (T4) level. Which of the following is the most common cause
of this primary endocrine disorder?
A. Graves disease
B. Hashimoto thyroiditis
C. Subacute thyroiditis
D. Toxic multinodular goiter
Rationale: Hashimoto thyroiditis is an autoimmune disorder and the most common cause of
primary hypothyroidism, characterized by elevated TSH and low T4. Graves disease causes
, hyperthyroidism, while subacute thyroiditis and toxic multinodular goiter are associated with
excess thyroid hormone production.
6. A clinical researcher is studying the mechanisms of cell injury. Which of the following
subcellular alterations represents the earliest reversible hallmark of acute hypoxic cell
injury?
A. Rupture of the plasma membrane
B. Cellular swelling due to sodium-potassium pump failure
C. Extensive nuclear pyknosis and karyolysis
D. Large amorphous densities within the mitochondrial matrix
Rationale: Hypoxia leads to ATP depletion, which immediately impairs the ATP-dependent
sodium-potassium pump, resulting in intracellular accumulation of sodium and water
(cellular swelling). Membrane rupture and nuclear dissolution are features of irreversible cell
death (necrosis).
7. A 68-year-old male with a 40-pack-year smoking history presents with a chronic cough,
hemoptysis, and significant weight loss. Chest radiography reveals a central mass. Biopsy
confirms squamous cell lung carcinoma. Which of the following paraneoplastic syndromes
is classically associated with small cell lung cancer, though squamous cell can present with
other imbalances?
A. Hypercalcemia due to PTH-related protein secretion
B. Syndrome of inappropriate antidiuretic hormone secretion (SIADH)
C. Cushing syndrome due to ectopic ACTH production
D. Both B and C
Rationale: Small cell lung carcinoma is well-known for paraneoplastic production of ADH
(leading to SIADH) and ACTH (leading to Cushing syndrome). Squamous cell carcinoma is
more commonly associated with PTH-related protein causing hypercalcemia, but small cell
frequently drives SIADH and ectopic ACTH.
8. An 18-year-old college student presents with fever, severe pharyngitis, posterior cervical
lymphadenopathy, and splenomegaly. A heterophile antibody test is positive. Which
infectious agent is responsible for this condition?
A. Cytomegalovirus
B. Epstein-Barr virus
C. Streptococcus pyogenes
QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED
ANSWERS PLUS RATIONALES | GUARANTEED PASS | LATEST
EXAM UPDATE | EXAM PREP | STUDY GUIDE | PRACTICE
TEST| DOWNLOAD INSTANT PDF
1. A 45-year-old male presents to the clinic complaining of chronic, burning epigastric pain
that worsens on an empty stomach and is temporarily relieved by eating food or taking
antacids. Endoscopic evaluation confirms a peptic ulcer. Which of the following
microorganisms is most commonly associated with the pathogenesis of this condition?
A. Escherichia coli
B. Helicobacter pylori
C. Streptococcus pneumoniae
D. Clostridium difficile
Rationale: Helicobacter pylori is a spiral-shaped bacterium that colonizes the gastric mucosa,
producing urease and neutralizing gastric acid, which leads to mucosal inflammation,
epithelial cell damage, and ulcer formation. The other listed organisms are not primary
causative agents of peptic ulcer disease.
2. A 60-year-old female with a long-standing history of poorly controlled hypertension
presents with left ventricular hypertrophy. Which cellular adaptation mechanism is
primarily responsible for the thickening of the myocardial wall in response to chronic
hemodynamic overload?
A. Atrophy
B. Metaplasia
C. Hypertrophy
D. Dysplasia
Rationale: Hypertrophy is an increase in the size of cells resulting in an enlarged tissue mass,
which occurs in cardiac muscle cells facing increased workload such as systemic
hypertension. Atrophy is a decrease in cell size, metaplasia is the reversible replacement of one
mature cell type by another, and dysplasia represents disordered cellular growth.
3. A patient is evaluated in the emergency department following a severe motor vehicle
crash. Laboratory findings reveal profound metabolic acidosis with an elevated anion gap.
,Which of the following clinical scenarios is the most likely cause of an elevated anion gap
metabolic acidosis?
A. Severe diarrhea resulting in excessive bicarbonate loss
B. Lactic acidosis secondary to tissue hypoperfusion and shock
C. Renal tubular acidosis type 2
D. Administration of large volumes of normal saline solution
Rationale: Lactic acidosis leads to the accumulation of unmeasured organic anions, thereby
increasing the anion gap. Diarrhea, normal saline infusion, and renal tubular acidosis
typically cause normal anion gap (hyperchloremic) metabolic acidosis due to direct
bicarbonate loss or renal retention of chloride.
4. A 52-year-old male develops sudden, excruciating pain in his right great toe. Joint
aspiration reveals negatively birefringent needle-shaped crystals. Which of the following
biochemical abnormalities is the underlying cause of this condition?
A. Hypercalcemia
B. Hyperuricemia
C. Hypokalemia
D. Hyperglycemia
Rationale: Gout is caused by the precipitation of monosodium urate crystals in joints due to
hyperuricemia, resulting from overproduction or underexcretion of uric acid. Calcium,
potassium, and glucose imbalances do not cause urate crystal formation.
5. A 30-year-old female presents with fatigue, weight gain, constipation, and cold
intolerance. Laboratory tests show an elevated thyroid-stimulating hormone (TSH) level
and a decreased free thyroxine (T4) level. Which of the following is the most common cause
of this primary endocrine disorder?
A. Graves disease
B. Hashimoto thyroiditis
C. Subacute thyroiditis
D. Toxic multinodular goiter
Rationale: Hashimoto thyroiditis is an autoimmune disorder and the most common cause of
primary hypothyroidism, characterized by elevated TSH and low T4. Graves disease causes
, hyperthyroidism, while subacute thyroiditis and toxic multinodular goiter are associated with
excess thyroid hormone production.
6. A clinical researcher is studying the mechanisms of cell injury. Which of the following
subcellular alterations represents the earliest reversible hallmark of acute hypoxic cell
injury?
A. Rupture of the plasma membrane
B. Cellular swelling due to sodium-potassium pump failure
C. Extensive nuclear pyknosis and karyolysis
D. Large amorphous densities within the mitochondrial matrix
Rationale: Hypoxia leads to ATP depletion, which immediately impairs the ATP-dependent
sodium-potassium pump, resulting in intracellular accumulation of sodium and water
(cellular swelling). Membrane rupture and nuclear dissolution are features of irreversible cell
death (necrosis).
7. A 68-year-old male with a 40-pack-year smoking history presents with a chronic cough,
hemoptysis, and significant weight loss. Chest radiography reveals a central mass. Biopsy
confirms squamous cell lung carcinoma. Which of the following paraneoplastic syndromes
is classically associated with small cell lung cancer, though squamous cell can present with
other imbalances?
A. Hypercalcemia due to PTH-related protein secretion
B. Syndrome of inappropriate antidiuretic hormone secretion (SIADH)
C. Cushing syndrome due to ectopic ACTH production
D. Both B and C
Rationale: Small cell lung carcinoma is well-known for paraneoplastic production of ADH
(leading to SIADH) and ACTH (leading to Cushing syndrome). Squamous cell carcinoma is
more commonly associated with PTH-related protein causing hypercalcemia, but small cell
frequently drives SIADH and ectopic ACTH.
8. An 18-year-old college student presents with fever, severe pharyngitis, posterior cervical
lymphadenopathy, and splenomegaly. A heterophile antibody test is positive. Which
infectious agent is responsible for this condition?
A. Cytomegalovirus
B. Epstein-Barr virus
C. Streptococcus pyogenes
