,NSG 120 Advanced Pathophysiology: Cellular
Injury, Inflammation, and Fluid Homeostasis
Prep questions with correct verified answers
Subject: Pathophysiology | Subtopic: Cellular Adaptation, Inflammation, and
Fluid/Electrolyte Balance
Question 1: A 55-year-old patient with a long history of gastroesophageal reflux disease (GERD)
undergoes an endoscopic biopsy of the distal esophagus. The report indicates the presence of
columnar epithelium with goblet cells instead of the normal stratified squamous epithelium.
Which process best describes this cellular alteration?
A) Hyperplasia
B) Metaplasia
C) Dysplasia
D) Anaplasia
Correct Answer: B) Metaplasia
Explanation: Metaplasia is the reversible replacement of one adult cell type (in this case,
stratified squamous epithelium) with another adult cell type (columnar epithelium) that is better
able to withstand a specific stressor—in this case, chronic acid exposure. Hyperplasia is an
increase in cell number, dysplasia is disordered growth/maturation, and anaplasia is a hallmark
of malignancy characterized by a lack of cellular differentiation.
Question 2: Which of the following mechanisms is primarily responsible for the cellular swelling
observed during the early stages of hypoxic cell injury?
A) Increased protein synthesis
B) Accumulation of intracellular lipids
C) Failure of the $Na^+/K^+$ ATPase pump
D) Increased mitochondrial oxidative phosphorylation
Correct Answer: C) Failure of the $Na^+/K^+$ ATPase pump
Explanation: Hypoxia leads to a reduction in ATP production. Since the $Na^+/K^+$ ATPase
pump is energy-dependent, it fails during ATP depletion. This results in the accumulation of
,sodium within the cell, which creates an osmotic gradient that pulls water into the cell, causing
acute cellular swelling (hydropic degeneration). Lipid accumulation and protein synthesis
changes are typically later or specific metabolic manifestations, not the primary cause of acute
swelling.
Question 3: A patient experiences a myocardial infarction. Laboratory results show significantly
elevated levels of cardiac troponins. These enzymes are released into the bloodstream primarily
due to:
A) Apoptosis induced by mitochondrial cytochrome c release
B) Rupture of the plasma membrane following irreversible cellular injury
C) Exocytosis of storage granules during the inflammatory response
D) Increased permeability of the nuclear envelope
Correct Answer: B) Rupture of the plasma membrane following irreversible cellular injury
Explanation: In irreversible cell injury (necrosis), the structural integrity of the plasma
membrane is compromised, allowing intracellular contents, such as enzymes and proteins
(troponins, creatine kinase), to leak into the extracellular fluid and systemic circulation.
Apoptosis is a programmed, non-inflammatory process that does not typically result in
membrane rupture or massive release of cytoplasmic enzymes into the blood.
Question 4: During the inflammatory response, which of the following chemical mediators is
most directly responsible for the classic clinical sign of "dolor" (pain)?
A) Histamine
B) Prostaglandins
C) Complement C3b
D) Nitric Oxide
Correct Answer: B) Prostaglandins
Explanation: While histamine is primarily responsible for vasodilation and increased capillary
permeability (leading to swelling and redness), prostaglandins and bradykinin are the primary
mediators that sensitize nerve endings, resulting in the sensation of pain (dolor). Complement
C3b is an opsonin involved in phagocytosis, and nitric oxide acts primarily as a vasodilator.
Question 5: A patient with severe, prolonged vomiting is at high risk for developing an acid-base
imbalance. Which compensation would be expected by the body?
, A) Renal excretion of bicarbonate
B) Renal retention of hydrogen ions
C) Hypoventilation to retain $CO_2$
D) Increased secretion of $NH_4^+$
Correct Answer: C) Hypoventilation to retain $CO_2$
Explanation: Prolonged vomiting leads to the loss of hydrochloric acid, causing metabolic
alkalosis. To compensate, the respiratory center slows the breathing rate (hypoventilation) to
retain $CO_2$ (a volatile acid) in an attempt to lower the pH back toward normal. Options A
and B would worsen the alkalosis.
Question 6: Which laboratory finding would be most consistent with a diagnosis of Respiratory
Acidosis in an acute clinical setting?
A) pH 7.25, $PaCO_2$ 50 mmHg, $HCO_3^-$ 24 mEq/L
B) pH 7.50, $PaCO_2$ 30 mmHg, $HCO_3^-$ 24 mEq/L
C) pH 7.30, $PaCO_2$ 40 mmHg, $HCO_3^-$ 18 mEq/L
D) pH 7.45, $PaCO_2$ 45 mmHg, $HCO_3^-$ 26 mEq/L
Correct Answer: A) pH 7.25, $PaCO_2$ 50 mmHg, $HCO_3^-$ 24 mEq/L
Explanation: Respiratory acidosis is characterized by an elevated $PaCO_2$ (due to
hypoventilation) resulting in a decreased pH. In the acute phase, the $HCO_3^-$ remains
normal because renal compensation takes hours to days to occur. Option B represents
respiratory alkalosis, and Option C represents metabolic acidosis.
Question 7: A patient with congestive heart failure presents with significant peripheral edema.
This edema is primarily a result of:
A) Decreased capillary oncotic pressure
B) Increased capillary hydrostatic pressure
C) Lymphatic obstruction
D) Increased tissue sodium levels
Correct Answer: B) Increased capillary hydrostatic pressure
Injury, Inflammation, and Fluid Homeostasis
Prep questions with correct verified answers
Subject: Pathophysiology | Subtopic: Cellular Adaptation, Inflammation, and
Fluid/Electrolyte Balance
Question 1: A 55-year-old patient with a long history of gastroesophageal reflux disease (GERD)
undergoes an endoscopic biopsy of the distal esophagus. The report indicates the presence of
columnar epithelium with goblet cells instead of the normal stratified squamous epithelium.
Which process best describes this cellular alteration?
A) Hyperplasia
B) Metaplasia
C) Dysplasia
D) Anaplasia
Correct Answer: B) Metaplasia
Explanation: Metaplasia is the reversible replacement of one adult cell type (in this case,
stratified squamous epithelium) with another adult cell type (columnar epithelium) that is better
able to withstand a specific stressor—in this case, chronic acid exposure. Hyperplasia is an
increase in cell number, dysplasia is disordered growth/maturation, and anaplasia is a hallmark
of malignancy characterized by a lack of cellular differentiation.
Question 2: Which of the following mechanisms is primarily responsible for the cellular swelling
observed during the early stages of hypoxic cell injury?
A) Increased protein synthesis
B) Accumulation of intracellular lipids
C) Failure of the $Na^+/K^+$ ATPase pump
D) Increased mitochondrial oxidative phosphorylation
Correct Answer: C) Failure of the $Na^+/K^+$ ATPase pump
Explanation: Hypoxia leads to a reduction in ATP production. Since the $Na^+/K^+$ ATPase
pump is energy-dependent, it fails during ATP depletion. This results in the accumulation of
,sodium within the cell, which creates an osmotic gradient that pulls water into the cell, causing
acute cellular swelling (hydropic degeneration). Lipid accumulation and protein synthesis
changes are typically later or specific metabolic manifestations, not the primary cause of acute
swelling.
Question 3: A patient experiences a myocardial infarction. Laboratory results show significantly
elevated levels of cardiac troponins. These enzymes are released into the bloodstream primarily
due to:
A) Apoptosis induced by mitochondrial cytochrome c release
B) Rupture of the plasma membrane following irreversible cellular injury
C) Exocytosis of storage granules during the inflammatory response
D) Increased permeability of the nuclear envelope
Correct Answer: B) Rupture of the plasma membrane following irreversible cellular injury
Explanation: In irreversible cell injury (necrosis), the structural integrity of the plasma
membrane is compromised, allowing intracellular contents, such as enzymes and proteins
(troponins, creatine kinase), to leak into the extracellular fluid and systemic circulation.
Apoptosis is a programmed, non-inflammatory process that does not typically result in
membrane rupture or massive release of cytoplasmic enzymes into the blood.
Question 4: During the inflammatory response, which of the following chemical mediators is
most directly responsible for the classic clinical sign of "dolor" (pain)?
A) Histamine
B) Prostaglandins
C) Complement C3b
D) Nitric Oxide
Correct Answer: B) Prostaglandins
Explanation: While histamine is primarily responsible for vasodilation and increased capillary
permeability (leading to swelling and redness), prostaglandins and bradykinin are the primary
mediators that sensitize nerve endings, resulting in the sensation of pain (dolor). Complement
C3b is an opsonin involved in phagocytosis, and nitric oxide acts primarily as a vasodilator.
Question 5: A patient with severe, prolonged vomiting is at high risk for developing an acid-base
imbalance. Which compensation would be expected by the body?
, A) Renal excretion of bicarbonate
B) Renal retention of hydrogen ions
C) Hypoventilation to retain $CO_2$
D) Increased secretion of $NH_4^+$
Correct Answer: C) Hypoventilation to retain $CO_2$
Explanation: Prolonged vomiting leads to the loss of hydrochloric acid, causing metabolic
alkalosis. To compensate, the respiratory center slows the breathing rate (hypoventilation) to
retain $CO_2$ (a volatile acid) in an attempt to lower the pH back toward normal. Options A
and B would worsen the alkalosis.
Question 6: Which laboratory finding would be most consistent with a diagnosis of Respiratory
Acidosis in an acute clinical setting?
A) pH 7.25, $PaCO_2$ 50 mmHg, $HCO_3^-$ 24 mEq/L
B) pH 7.50, $PaCO_2$ 30 mmHg, $HCO_3^-$ 24 mEq/L
C) pH 7.30, $PaCO_2$ 40 mmHg, $HCO_3^-$ 18 mEq/L
D) pH 7.45, $PaCO_2$ 45 mmHg, $HCO_3^-$ 26 mEq/L
Correct Answer: A) pH 7.25, $PaCO_2$ 50 mmHg, $HCO_3^-$ 24 mEq/L
Explanation: Respiratory acidosis is characterized by an elevated $PaCO_2$ (due to
hypoventilation) resulting in a decreased pH. In the acute phase, the $HCO_3^-$ remains
normal because renal compensation takes hours to days to occur. Option B represents
respiratory alkalosis, and Option C represents metabolic acidosis.
Question 7: A patient with congestive heart failure presents with significant peripheral edema.
This edema is primarily a result of:
A) Decreased capillary oncotic pressure
B) Increased capillary hydrostatic pressure
C) Lymphatic obstruction
D) Increased tissue sodium levels
Correct Answer: B) Increased capillary hydrostatic pressure
