WGU D115 Advanced Pathophysiology for APN – Objective
Assessment Practice Exam 2026 Edition | 185 APN-Level
Questions with Verified Answers & Detailed Rationales |
Comprehensive Study Guide | Pass with Confidence
1. Cellular swelling during acute injury is primarily caused by:
• A) Increased protein synthesis
• B) Sodium-potassium pump failure
• C) Mitochondrial hyperactivity
• D) Lysosomal rupture
Rationale: Cellular swelling (hydropic change) results from ATP depletion leading to
Na⁺/K⁺ pump failure, causing sodium and water influx into the cell.
2. Which process is responsible for programmed cell death (apoptosis)?
• A) Necrosis
• B) Autophagy
• C) Apoptosis
• D) Ischemia
Rationale: Apoptosis is an energy-dependent, genetically controlled process of
programmed cell death, distinct from necrosis.
3. Which type of necrosis is typically associated with liquefactive tissue damage in
the brain?
• A) Coagulative necrosis
• B) Liquefactive necrosis
• C) Caseous necrosis
• D) Fat necrosis
,Rationale: Liquefactive necrosis occurs in the brain and other organs where enzymatic
digestion liquefies dead tissue. Coagulative necrosis is common in solid organs.
4. Which cellular organelle is most affected during hypoxia, leading to ATP
depletion?
• A) Ribosomes
• B) Mitochondria
• C) Lysosomes
• D) Golgi apparatus
Rationale: Mitochondria are the primary site of oxidative phosphorylation; hypoxia impairs
mitochondrial function, leading to ATP depletion.
5. The hallmark of reversible cellular injury is:
• A) Nuclear fragmentation
• B) Cellular swelling and fatty change
• C) Lysosomal rupture
• D) Membrane blebbing
Rationale: Reversible injury is characterized by cellular swelling and fatty change. Nuclear
fragmentation and membrane blebbing indicate irreversible injury.
6. Which of the following is a feature of irreversible cellular injury?
• A) Decreased intracellular calcium
• B) Increased ATP production
• C) Severe mitochondrial dysfunction and membrane damage
• D) Reduced intracellular sodium
Rationale: Irreversible injury involves severe mitochondrial dysfunction, loss of membrane
integrity, and nuclear changes.
7. What is the primary mechanism of hypoxic injury?
• A) Reduction in oxidative phosphorylation and ATP depletion
, • B) Increased protein synthesis
• C) Enhanced glucose metabolism
• D) Increased mitochondrial activity
Rationale: Hypoxia reduces oxidative phosphorylation, causing ATP depletion and cellular
dysfunction.
8. Which enzyme is released from damaged cells and is a marker of hepatocellular
injury?
• A) Alanine aminotransferase (ALT)
• B) Creatine kinase (CK)
• C) Lactate dehydrogenase (LDH)
• D) Alkaline phosphatase (ALP)
Rationale: ALT is a liver-specific enzyme released during hepatocellular injury. CK is a
marker of muscle injury; LDH and ALP are less specific.
9. Which of the following is a hallmark of apoptosis?
• A) Cell shrinkage and formation of apoptotic bodies
• B) Cell swelling and rupture
• C) Inflammatory response
• D) Nuclear pyknosis with inflammation
Rationale: Apoptosis is characterized by cell shrinkage, chromatin condensation, and
formation of apoptotic bodies without inflammation. Necrosis involves swelling and
inflammation.
10. Calcium overload in cells during injury primarily results from:
• A) Activation of calcium pumps
• B) Mitochondrial damage and release of calcium from stores
• C) Increased calcium excretion
• D) Decreased calcium intake
, Rationale: Mitochondrial damage and release of calcium from the endoplasmic reticulum
lead to cytosolic calcium overload, activating enzymes that cause cell damage.
11. Which of the following is a characteristic of caseous necrosis?
• A) Liquefied tissue
• B) Cheesy, granular appearance
• C) Firm, pale tissue
• D) Yellow, soft material
Rationale: Caseous necrosis (e.g., tuberculosis) has a cheesy, granular appearance on
gross examination.
12. Which type of necrosis is most commonly associated with myocardial infarction?
• A) Coagulative necrosis
• B) Liquefactive necrosis
• C) Caseous necrosis
• D) Fat necrosis
Rationale: Myocardial infarction results in coagulative necrosis, where tissue architecture is
preserved for days.
13. Which of the following is a mediator of cell injury from reactive oxygen species
(ROS)?
• A) Increased ATP
• B) Lipid peroxidation of cell membranes
• C) Enhanced protein synthesis
• D) Decreased DNA damage
Rationale: ROS cause cell injury through lipid peroxidation of membranes, protein
modification, and DNA damage.
14. Which process is responsible for the removal of damaged organelles by
autophagocytosis?
Assessment Practice Exam 2026 Edition | 185 APN-Level
Questions with Verified Answers & Detailed Rationales |
Comprehensive Study Guide | Pass with Confidence
1. Cellular swelling during acute injury is primarily caused by:
• A) Increased protein synthesis
• B) Sodium-potassium pump failure
• C) Mitochondrial hyperactivity
• D) Lysosomal rupture
Rationale: Cellular swelling (hydropic change) results from ATP depletion leading to
Na⁺/K⁺ pump failure, causing sodium and water influx into the cell.
2. Which process is responsible for programmed cell death (apoptosis)?
• A) Necrosis
• B) Autophagy
• C) Apoptosis
• D) Ischemia
Rationale: Apoptosis is an energy-dependent, genetically controlled process of
programmed cell death, distinct from necrosis.
3. Which type of necrosis is typically associated with liquefactive tissue damage in
the brain?
• A) Coagulative necrosis
• B) Liquefactive necrosis
• C) Caseous necrosis
• D) Fat necrosis
,Rationale: Liquefactive necrosis occurs in the brain and other organs where enzymatic
digestion liquefies dead tissue. Coagulative necrosis is common in solid organs.
4. Which cellular organelle is most affected during hypoxia, leading to ATP
depletion?
• A) Ribosomes
• B) Mitochondria
• C) Lysosomes
• D) Golgi apparatus
Rationale: Mitochondria are the primary site of oxidative phosphorylation; hypoxia impairs
mitochondrial function, leading to ATP depletion.
5. The hallmark of reversible cellular injury is:
• A) Nuclear fragmentation
• B) Cellular swelling and fatty change
• C) Lysosomal rupture
• D) Membrane blebbing
Rationale: Reversible injury is characterized by cellular swelling and fatty change. Nuclear
fragmentation and membrane blebbing indicate irreversible injury.
6. Which of the following is a feature of irreversible cellular injury?
• A) Decreased intracellular calcium
• B) Increased ATP production
• C) Severe mitochondrial dysfunction and membrane damage
• D) Reduced intracellular sodium
Rationale: Irreversible injury involves severe mitochondrial dysfunction, loss of membrane
integrity, and nuclear changes.
7. What is the primary mechanism of hypoxic injury?
• A) Reduction in oxidative phosphorylation and ATP depletion
, • B) Increased protein synthesis
• C) Enhanced glucose metabolism
• D) Increased mitochondrial activity
Rationale: Hypoxia reduces oxidative phosphorylation, causing ATP depletion and cellular
dysfunction.
8. Which enzyme is released from damaged cells and is a marker of hepatocellular
injury?
• A) Alanine aminotransferase (ALT)
• B) Creatine kinase (CK)
• C) Lactate dehydrogenase (LDH)
• D) Alkaline phosphatase (ALP)
Rationale: ALT is a liver-specific enzyme released during hepatocellular injury. CK is a
marker of muscle injury; LDH and ALP are less specific.
9. Which of the following is a hallmark of apoptosis?
• A) Cell shrinkage and formation of apoptotic bodies
• B) Cell swelling and rupture
• C) Inflammatory response
• D) Nuclear pyknosis with inflammation
Rationale: Apoptosis is characterized by cell shrinkage, chromatin condensation, and
formation of apoptotic bodies without inflammation. Necrosis involves swelling and
inflammation.
10. Calcium overload in cells during injury primarily results from:
• A) Activation of calcium pumps
• B) Mitochondrial damage and release of calcium from stores
• C) Increased calcium excretion
• D) Decreased calcium intake
, Rationale: Mitochondrial damage and release of calcium from the endoplasmic reticulum
lead to cytosolic calcium overload, activating enzymes that cause cell damage.
11. Which of the following is a characteristic of caseous necrosis?
• A) Liquefied tissue
• B) Cheesy, granular appearance
• C) Firm, pale tissue
• D) Yellow, soft material
Rationale: Caseous necrosis (e.g., tuberculosis) has a cheesy, granular appearance on
gross examination.
12. Which type of necrosis is most commonly associated with myocardial infarction?
• A) Coagulative necrosis
• B) Liquefactive necrosis
• C) Caseous necrosis
• D) Fat necrosis
Rationale: Myocardial infarction results in coagulative necrosis, where tissue architecture is
preserved for days.
13. Which of the following is a mediator of cell injury from reactive oxygen species
(ROS)?
• A) Increased ATP
• B) Lipid peroxidation of cell membranes
• C) Enhanced protein synthesis
• D) Decreased DNA damage
Rationale: ROS cause cell injury through lipid peroxidation of membranes, protein
modification, and DNA damage.
14. Which process is responsible for the removal of damaged organelles by
autophagocytosis?
