APPLIED PATHOPHYSIOLOGY FOR THE ADVANCED PRACTICE NURSE
EXAM QUESTIONS AND CORRECT ANSWERS
TOPIC: Cellular Pathophysiology
Q1: What is the primary mechanism of cellular injury in hypoxic conditions?
A) Protein misfolding
B) ATP depletion
C) DNA damage
D) Membrane rupture
ANSWER: B
EXPLANATION: Hypoxia leads to decreased oxidative phosphorylation, resulting in ATP depletion
which impairs sodium-potassium pump function, leading to cellular swelling and injury.
===========================================
Q2: Which intracellular organelle is most sensitive to hypoxic injury?
A) Nucleus
B) Mitochondria
C) Endoplasmic reticulum
D) Golgi apparatus
ANSWER: B
EXPLANATION: Mitochondria are particularly vulnerable to hypoxic injury due to their
dependence on oxygen for ATP production through oxidative phosphorylation.
,===========================================
Q3: What characteristic distinguishes apoptosis from necrosis?
A) Inflammation present
B) Energy-dependent process
C) Cellular swelling
D) Membrane disruption
ANSWER: B
EXPLANATION: Apoptosis is an active, energy-dependent programmed cell death that occurs
without inflammation, unlike necrosis which is passive and inflammatory.
===========================================
Q4: Which free radical is most commonly involved in oxidative cellular injury?
A) Superoxide
B) Hydroxyl radical
C) Hydrogen peroxide
D) Nitric oxide
ANSWER: B
EXPLANATION: Hydroxyl radical (OH•) is the most reactive and damaging free radical, causing
lipid peroxidation and DNA damage.
===========================================
Q5: What is the primary endogenous antioxidant enzyme system?
,A) Glutathione peroxidase
B) Catalase
C) Superoxide dismutase
D) All of the above
ANSWER: D
EXPLANATION: These three enzymes work together as the primary endogenous antioxidant
defense system against reactive oxygen species.
===========================================
Q6: Which cellular adaptation involves increase in cell number?
A) Hypertrophy
B) Hyperplasia
C) Atrophy
D) Metaplasia
ANSWER: B
EXPLANATION: Hyperplasia is an increase in the number of cells in an organ or tissue, often in
response to hormonal stimulation or increased functional demand.
===========================================
Q7: Barrett esophagus represents which cellular adaptation?
A) Dysplasia
B) Metaplasia
C) Anaplasia
, D) Hyperplasia
ANSWER: B
EXPLANATION: Barrett esophagus involves metaplastic change from squamous to columnar
epithelium in response to chronic gastric acid exposure.
===========================================
TOPIC: Inflammation and Healing
Q8: Which mediator is primarily responsible for vasodilation in acute inflammation?
A) Histamine
B) Bradykinin
C) Prostaglandins
D) All contribute
ANSWER: D
EXPLANATION: Multiple mediators including histamine, bradykinin, and prostaglandins work
synergistically to cause vasodilation during acute inflammation.
===========================================
Q9: What is the primary chemotactic factor for neutrophils?
A) C5a
B) IL-1
C) TNF-α
D) Histamine
EXAM QUESTIONS AND CORRECT ANSWERS
TOPIC: Cellular Pathophysiology
Q1: What is the primary mechanism of cellular injury in hypoxic conditions?
A) Protein misfolding
B) ATP depletion
C) DNA damage
D) Membrane rupture
ANSWER: B
EXPLANATION: Hypoxia leads to decreased oxidative phosphorylation, resulting in ATP depletion
which impairs sodium-potassium pump function, leading to cellular swelling and injury.
===========================================
Q2: Which intracellular organelle is most sensitive to hypoxic injury?
A) Nucleus
B) Mitochondria
C) Endoplasmic reticulum
D) Golgi apparatus
ANSWER: B
EXPLANATION: Mitochondria are particularly vulnerable to hypoxic injury due to their
dependence on oxygen for ATP production through oxidative phosphorylation.
,===========================================
Q3: What characteristic distinguishes apoptosis from necrosis?
A) Inflammation present
B) Energy-dependent process
C) Cellular swelling
D) Membrane disruption
ANSWER: B
EXPLANATION: Apoptosis is an active, energy-dependent programmed cell death that occurs
without inflammation, unlike necrosis which is passive and inflammatory.
===========================================
Q4: Which free radical is most commonly involved in oxidative cellular injury?
A) Superoxide
B) Hydroxyl radical
C) Hydrogen peroxide
D) Nitric oxide
ANSWER: B
EXPLANATION: Hydroxyl radical (OH•) is the most reactive and damaging free radical, causing
lipid peroxidation and DNA damage.
===========================================
Q5: What is the primary endogenous antioxidant enzyme system?
,A) Glutathione peroxidase
B) Catalase
C) Superoxide dismutase
D) All of the above
ANSWER: D
EXPLANATION: These three enzymes work together as the primary endogenous antioxidant
defense system against reactive oxygen species.
===========================================
Q6: Which cellular adaptation involves increase in cell number?
A) Hypertrophy
B) Hyperplasia
C) Atrophy
D) Metaplasia
ANSWER: B
EXPLANATION: Hyperplasia is an increase in the number of cells in an organ or tissue, often in
response to hormonal stimulation or increased functional demand.
===========================================
Q7: Barrett esophagus represents which cellular adaptation?
A) Dysplasia
B) Metaplasia
C) Anaplasia
, D) Hyperplasia
ANSWER: B
EXPLANATION: Barrett esophagus involves metaplastic change from squamous to columnar
epithelium in response to chronic gastric acid exposure.
===========================================
TOPIC: Inflammation and Healing
Q8: Which mediator is primarily responsible for vasodilation in acute inflammation?
A) Histamine
B) Bradykinin
C) Prostaglandins
D) All contribute
ANSWER: D
EXPLANATION: Multiple mediators including histamine, bradykinin, and prostaglandins work
synergistically to cause vasodilation during acute inflammation.
===========================================
Q9: What is the primary chemotactic factor for neutrophils?
A) C5a
B) IL-1
C) TNF-α
D) Histamine
