WGU D236 Pathophysiology: 300
Exam-Style Questions with Answers
and Rationales Latest
2025/2026||100% Verified Answers
And Rationales|| Graded A+
Question 1: A 55-year-old male with a 30-year smoking history
is examined for respiratory disturbance. Examination of his
bronchial airway reveals that stratified squamous epithelial cells
have replaced the normal columnar ciliated cells. What is this
process called?
Answer: Metaplasia
Rationale: Metaplasia is the reversible replacement of one
differentiated cell type with another, often in response to
chronic irritation like smoking. This is an adaptive response,
though it can increase cancer risk .
Question 2: What is the term for programmed cell death that
does not cause inflammation?
Answer: Apoptosis
Rationale: Apoptosis is a highly regulated, energy-dependent
process of programmed cell death where cells shrink and
fragment into apoptotic bodies that are phagocytosed without
triggering inflammation, unlike necrosis which typically does .
Question 3: A patient with COPD retains CO₂. Which acid-base
imbalance is expected?
Answer: Respiratory acidosis
Rationale: Respiratory acidosis is caused by hypoventilation
,leading to CO₂ retention, which increases PCO₂ and decreases
pH. COPD is a classic cause due to impaired gas exchange .
Question 4: Which electrolyte imbalance is most associated
with Trousseau and Chvostek signs?
Answer: Hypocalcemia
Rationale: Low serum calcium causes neuromuscular irritability.
Chvostek's sign (facial twitching) and Trousseau's sign (carpal
spasm) are classic physical exam findings for this imbalance .
Question 5: A patient has a serum potassium of 6.8 mEq/L and
an ECG showing peaked T waves. Which condition is this?
Answer: Hyperkalemia
Rationale: Hyperkalemia (elevated potassium) partially
depolarizes the resting membrane potential, inactivating
sodium channels and slowing conduction, producing the
characteristic peaked T waves .
Question 6: A patient with chronic kidney disease has a serum
potassium of 6.8 mEq/L and an ECG showing peaked T waves.
Which pathophysiologic mechanism best explains the ECG
change?
Answer: Partial depolarization of the resting membrane
potential
Rationale: This partial depolarization inactivates sodium
channels, slowing conduction and producing the peaked T
waves .
Question 7: In diabetic ketoacidosis (DKA), why would an
increased anion gap be observed?
Answer: Excess ketones consume bicarbonate (HCO3-)
Rationale: In DKA, the body produces excess ketones
(unmeasured anions) that consume bicarbonate (a measured
anion), leading to a larger anion gap .
,Question 8: A patient with vomiting has a pH of 7.55, PaCO2 of
45 mm Hg, and HCO3 of 36 mEq/L. This acid-base imbalance is
which type?
Answer: Metabolic alkalosis with no compensation
Rationale: The pH is high (alkalosis) and the HCO3 is high
(metabolic). Since PaCO2 is normal and not elevated, there is
no respiratory compensation .
Question 9: How does the respiratory system compensate for
acid-base disturbances?
Answer: By increasing or decreasing ventilation to adjust CO₂
Rationale: The lungs compensate for metabolic imbalances by
altering the rate and depth of breathing. In metabolic acidosis,
the respiratory system hyperventilates to blow off CO₂, and in
metabolic alkalosis, it hypoventilates to retain CO₂ .
Question 10: A patient with severe diarrhea is at risk for which
acid-base imbalance?
Answer: Metabolic acidosis
Rationale: Severe diarrhea causes a loss of bicarbonate-rich
intestinal fluids, leading to a non-anion-gap metabolic acidosis .
Question 11: What describes the function of diffusion?
Answer: Movement of molecules from high to low
concentration
Rationale: Diffusion is the passive movement of solutes from
an area of higher concentration to an area of lower
concentration until equilibrium is reached .
Question 12: What is the primary system responsible for
maintaining fluid homeostasis within the body?
Answer: Renin-Angiotensin-Aldosterone System (RAAS)
Rationale: RAAS is a key compensatory mechanism for low
blood pressure or volume. Angiotensin II provides quick
, vasoconstriction, while aldosterone provides a longer-term
volume increase .
Question 13: A patient with liver cirrhosis develops ascites due
to which condition?
Answer: Decreased hepatic synthesis of albumin
Rationale: Chronic liver disease reduces albumin synthesis,
lowering plasma oncotic pressure. This causes fluid to leak from
the vasculature into the peritoneal cavity, leading to ascites .
Question 14: A patient with a history of chronic alcoholism
presents with ascites and jaundice. Which pathophysiologic
mechanism most directly leads to ascites?
Answer: Decreased hepatic synthesis of albumin leading to
reduced plasma oncotic pressure
Rationale: Low albumin reduces oncotic pressure, causing fluid
to leak into the peritoneal cavity, forming ascites .
Question 15: A patient with chronic kidney disease presents
with anemia. What is the primary cause?
Answer: Lack of erythropoietin
Rationale: The kidneys produce erythropoietin (EPO), which
stimulates red blood cell production in the bone marrow. In
chronic kidney disease, this production is impaired, leading to
anemia .
Question 16: What are the symptoms of the "3 D's" (diabetes,
diuretics, dehydration)?
Answer: Fluid volume deficit
Rationale: These conditions share fluid volume deficit as a
common feature. Rapid, deep respirations (Kussmaul) may
occur if dehydration is accompanied by metabolic acidosis .
Exam-Style Questions with Answers
and Rationales Latest
2025/2026||100% Verified Answers
And Rationales|| Graded A+
Question 1: A 55-year-old male with a 30-year smoking history
is examined for respiratory disturbance. Examination of his
bronchial airway reveals that stratified squamous epithelial cells
have replaced the normal columnar ciliated cells. What is this
process called?
Answer: Metaplasia
Rationale: Metaplasia is the reversible replacement of one
differentiated cell type with another, often in response to
chronic irritation like smoking. This is an adaptive response,
though it can increase cancer risk .
Question 2: What is the term for programmed cell death that
does not cause inflammation?
Answer: Apoptosis
Rationale: Apoptosis is a highly regulated, energy-dependent
process of programmed cell death where cells shrink and
fragment into apoptotic bodies that are phagocytosed without
triggering inflammation, unlike necrosis which typically does .
Question 3: A patient with COPD retains CO₂. Which acid-base
imbalance is expected?
Answer: Respiratory acidosis
Rationale: Respiratory acidosis is caused by hypoventilation
,leading to CO₂ retention, which increases PCO₂ and decreases
pH. COPD is a classic cause due to impaired gas exchange .
Question 4: Which electrolyte imbalance is most associated
with Trousseau and Chvostek signs?
Answer: Hypocalcemia
Rationale: Low serum calcium causes neuromuscular irritability.
Chvostek's sign (facial twitching) and Trousseau's sign (carpal
spasm) are classic physical exam findings for this imbalance .
Question 5: A patient has a serum potassium of 6.8 mEq/L and
an ECG showing peaked T waves. Which condition is this?
Answer: Hyperkalemia
Rationale: Hyperkalemia (elevated potassium) partially
depolarizes the resting membrane potential, inactivating
sodium channels and slowing conduction, producing the
characteristic peaked T waves .
Question 6: A patient with chronic kidney disease has a serum
potassium of 6.8 mEq/L and an ECG showing peaked T waves.
Which pathophysiologic mechanism best explains the ECG
change?
Answer: Partial depolarization of the resting membrane
potential
Rationale: This partial depolarization inactivates sodium
channels, slowing conduction and producing the peaked T
waves .
Question 7: In diabetic ketoacidosis (DKA), why would an
increased anion gap be observed?
Answer: Excess ketones consume bicarbonate (HCO3-)
Rationale: In DKA, the body produces excess ketones
(unmeasured anions) that consume bicarbonate (a measured
anion), leading to a larger anion gap .
,Question 8: A patient with vomiting has a pH of 7.55, PaCO2 of
45 mm Hg, and HCO3 of 36 mEq/L. This acid-base imbalance is
which type?
Answer: Metabolic alkalosis with no compensation
Rationale: The pH is high (alkalosis) and the HCO3 is high
(metabolic). Since PaCO2 is normal and not elevated, there is
no respiratory compensation .
Question 9: How does the respiratory system compensate for
acid-base disturbances?
Answer: By increasing or decreasing ventilation to adjust CO₂
Rationale: The lungs compensate for metabolic imbalances by
altering the rate and depth of breathing. In metabolic acidosis,
the respiratory system hyperventilates to blow off CO₂, and in
metabolic alkalosis, it hypoventilates to retain CO₂ .
Question 10: A patient with severe diarrhea is at risk for which
acid-base imbalance?
Answer: Metabolic acidosis
Rationale: Severe diarrhea causes a loss of bicarbonate-rich
intestinal fluids, leading to a non-anion-gap metabolic acidosis .
Question 11: What describes the function of diffusion?
Answer: Movement of molecules from high to low
concentration
Rationale: Diffusion is the passive movement of solutes from
an area of higher concentration to an area of lower
concentration until equilibrium is reached .
Question 12: What is the primary system responsible for
maintaining fluid homeostasis within the body?
Answer: Renin-Angiotensin-Aldosterone System (RAAS)
Rationale: RAAS is a key compensatory mechanism for low
blood pressure or volume. Angiotensin II provides quick
, vasoconstriction, while aldosterone provides a longer-term
volume increase .
Question 13: A patient with liver cirrhosis develops ascites due
to which condition?
Answer: Decreased hepatic synthesis of albumin
Rationale: Chronic liver disease reduces albumin synthesis,
lowering plasma oncotic pressure. This causes fluid to leak from
the vasculature into the peritoneal cavity, leading to ascites .
Question 14: A patient with a history of chronic alcoholism
presents with ascites and jaundice. Which pathophysiologic
mechanism most directly leads to ascites?
Answer: Decreased hepatic synthesis of albumin leading to
reduced plasma oncotic pressure
Rationale: Low albumin reduces oncotic pressure, causing fluid
to leak into the peritoneal cavity, forming ascites .
Question 15: A patient with chronic kidney disease presents
with anemia. What is the primary cause?
Answer: Lack of erythropoietin
Rationale: The kidneys produce erythropoietin (EPO), which
stimulates red blood cell production in the bone marrow. In
chronic kidney disease, this production is impaired, leading to
anemia .
Question 16: What are the symptoms of the "3 D's" (diabetes,
diuretics, dehydration)?
Answer: Fluid volume deficit
Rationale: These conditions share fluid volume deficit as a
common feature. Rapid, deep respirations (Kussmaul) may
occur if dehydration is accompanied by metabolic acidosis .
