BIOD 331 Pathophysiology Module 4 Exam
-Portage Learning | All Questions And
Solutions (Rationales) 2026 | Exam Prep
Guide |
1. A 54-year-old male presenting with chronic heartburn and dysphagia undergoes an
upper endoscopy, which reveals columnar epithelium replacing normal squamous
epithelium in the lower esophagus. Which cellular adaptation process has occurred in this
patient?
A. Metaplasia
B. Hypertrophy
C. Dysplasia
D. Hyperplasia
Rationale: Metaplasia is the reversible replacement of one adult cell type by another adult
cell type, often as an adaptive response to chronic irritation or stress. In Barrett esophagus,
chronic gastric acid exposure leads to squamous-to-columnar metaplasia.
2. A patient with long-standing, untreated essential hypertension demonstrates thickening
of the left ventricular wall on an echocardiogram. Which pathophysiological cellular
change is responsible for this finding?
A. Compensatory hyperplasia
B. Pathologic hypertrophy
C. Metaplastic remodeling
D. Pathologic atrophy
Rationale: Pathologic hypertrophy involves an increase in individual cell size without cell
division, occurring in response to increased workload or mechanical stress such as systemic
vascular resistance in chronic hypertension.
3. During ischemia, cellular energy failure leads to dysfunction of the membrane-bound
sodium-potassium adenosine triphosphatase (Na+/K+ ATPase) pump. Which immediate
intracellular event results directly from this failure?
,A. Efflux of calcium ions into the extracellular space
B. Influx of sodium and water causing cellular swelling
C. Efflux of potassium leading to hyperpolarization
D. Rapid intracellular lipid accumulation
Rationale: Inhibition of the Na+/K+ ATPase pump prevents normal transport of sodium out of
the cell. The accumulation of intracellular sodium creates an osmotic gradient that draws
water into the cell, resulting in acute cellular swelling.
4. A biopsy of a liver lesion reveals a distinct area of tissue destruction characterized by
dead tissue that retains its structural architecture for several days. Which type of necrosis
is described?
A. Liquefactive necrosis
B. Caseous necrosis
C. Coagulative necrosis
D. Fat necrosis
Rationale: Coagulative necrosis typically results from sudden ischemia or hypoxia in solid
organs (except the brain). Denaturation of cellular proteins preserves the basic outline of the
dead cells and tissue architecture for a few days.
5. Which organ tissue exhibits liquefactive necrosis as its primary response to ischemic
injury due to its rich lipid content and high levels of hydrolytic enzymes?
A. Myocardium
B. Renal cortex
C. Brain
D. Liver
Rationale: Hypoxic or ischemic injury in the central nervous system causes rapid liquefactive
necrosis, where hydrolytic enzymes degrade dead tissue into a soft, liquid mass.
6. A pulmonary granuloma removed from a patient with active tuberculosis demonstrates
friable, soft, "cheese-like" dead tissue under microscopic evaluation. What specific necrotic
process defines this lesion?
,A. Caseous necrosis
B. Fibrinoid necrosis
C. Fat necrosis
D. Liquefactive necrosis
Rationale: Caseous necrosis is characteristic of tuberculous infections and represents a
combination of coagulative and liquefactive necrosis, forming a crumbly, cheese-like debris
enclosed by a granulomatous inflammatory border.
7. A patient with a severe crush injury to the lower extremity presents with localized tissue
death, bacterial infection, and a foul odor accompanied by gas bubbles under the skin.
Which condition is present?
A. Dry gangrene
B. Wet gangrene
C. Gas gangrene
D. Fibrinoid necrosis
Rationale: Gas gangrene is a specialized form of necrosis caused by anaerobic spore-forming
bacteria, such as Clostridium species, which produce toxins that destroy surrounding tissue
and release gas bubbles.
8. Apoptosis differs fundamentally from necrosis because apoptosis is characterized by
which of the following features?
A. Extensive inflammatory response surrounding destroyed cells
B. Controlled, energy-dependent programmed cell death without cell lysis
C. Passive cell rupture and leakage of cytosolic contents
D. Massive loss of membrane integrity leading to organelle swelling
Rationale: Apoptosis is an active, energy-dependent (ATP-dependent) process of
programmed cell death where cells shrink and fragment into apoptotic bodies that are
phagocytosed without eliciting an inflammatory response.
9. Which physiological mechanism directly accounts for the release of reactive oxygen
species (ROS) during reperfusion following a period of tissue ischemia?
, A. Complete shutdown of xanthine oxidase activity
B. Rapid restoration of oxygen supplying uncoupled mitochondrial respiratory chains
C. Immediate intracellular accumulation of protective antioxidants
D. Inhibition of neutrophils entering the damaged tissue site
Rationale: Ischemia-reperfusion injury occurs when reoxygenation supplies oxygen to
damaged mitochondria and enzymatic pathways, generating high concentrations of reactive
oxygen species (ROS) that cause secondary membrane damage.
10. Intracellular calcium accumulation during hypoxic cell injury promotes tissue
breakdown primarily by activating which group of enzymes?
A. Polymerases and transcriptases
B. Phospholipases, endonucleases, and proteases
C. Dehydrogenases and synthetases
D. Cyclooxygenases and lipoxygenases exclusively
Rationale: Excess intracellular calcium activates destructive enzymes including
phospholipases (which degrade membrane phospholipids), proteases (which disassemble
cytoskeletal proteins), and endonucleases (which fragment chromatin).
11. During acute inflammation, which vascular alteration immediately follows transient
vasoconstriction at the site of injury?
A. Arteriolar vasodilation causing hyperemic blood flow
B. Decreased microvascular permeability
C. Rapid endothelial cell contraction narrowing capillary beds
D. Decreased hydrostatic pressure within local venules
Rationale: Following brief arteriolar constriction, histamine and other mediators induce
prompt arteriolar vasodilation, increasing blood flow (hyperemia) to the injured area, causing
redness and heat.
12. Which inflammatory chemical mediator is principally responsible for early vascular
permeability and arteriolar vasodilation immediately after tissue trauma?
A. Leukotriene B4
-Portage Learning | All Questions And
Solutions (Rationales) 2026 | Exam Prep
Guide |
1. A 54-year-old male presenting with chronic heartburn and dysphagia undergoes an
upper endoscopy, which reveals columnar epithelium replacing normal squamous
epithelium in the lower esophagus. Which cellular adaptation process has occurred in this
patient?
A. Metaplasia
B. Hypertrophy
C. Dysplasia
D. Hyperplasia
Rationale: Metaplasia is the reversible replacement of one adult cell type by another adult
cell type, often as an adaptive response to chronic irritation or stress. In Barrett esophagus,
chronic gastric acid exposure leads to squamous-to-columnar metaplasia.
2. A patient with long-standing, untreated essential hypertension demonstrates thickening
of the left ventricular wall on an echocardiogram. Which pathophysiological cellular
change is responsible for this finding?
A. Compensatory hyperplasia
B. Pathologic hypertrophy
C. Metaplastic remodeling
D. Pathologic atrophy
Rationale: Pathologic hypertrophy involves an increase in individual cell size without cell
division, occurring in response to increased workload or mechanical stress such as systemic
vascular resistance in chronic hypertension.
3. During ischemia, cellular energy failure leads to dysfunction of the membrane-bound
sodium-potassium adenosine triphosphatase (Na+/K+ ATPase) pump. Which immediate
intracellular event results directly from this failure?
,A. Efflux of calcium ions into the extracellular space
B. Influx of sodium and water causing cellular swelling
C. Efflux of potassium leading to hyperpolarization
D. Rapid intracellular lipid accumulation
Rationale: Inhibition of the Na+/K+ ATPase pump prevents normal transport of sodium out of
the cell. The accumulation of intracellular sodium creates an osmotic gradient that draws
water into the cell, resulting in acute cellular swelling.
4. A biopsy of a liver lesion reveals a distinct area of tissue destruction characterized by
dead tissue that retains its structural architecture for several days. Which type of necrosis
is described?
A. Liquefactive necrosis
B. Caseous necrosis
C. Coagulative necrosis
D. Fat necrosis
Rationale: Coagulative necrosis typically results from sudden ischemia or hypoxia in solid
organs (except the brain). Denaturation of cellular proteins preserves the basic outline of the
dead cells and tissue architecture for a few days.
5. Which organ tissue exhibits liquefactive necrosis as its primary response to ischemic
injury due to its rich lipid content and high levels of hydrolytic enzymes?
A. Myocardium
B. Renal cortex
C. Brain
D. Liver
Rationale: Hypoxic or ischemic injury in the central nervous system causes rapid liquefactive
necrosis, where hydrolytic enzymes degrade dead tissue into a soft, liquid mass.
6. A pulmonary granuloma removed from a patient with active tuberculosis demonstrates
friable, soft, "cheese-like" dead tissue under microscopic evaluation. What specific necrotic
process defines this lesion?
,A. Caseous necrosis
B. Fibrinoid necrosis
C. Fat necrosis
D. Liquefactive necrosis
Rationale: Caseous necrosis is characteristic of tuberculous infections and represents a
combination of coagulative and liquefactive necrosis, forming a crumbly, cheese-like debris
enclosed by a granulomatous inflammatory border.
7. A patient with a severe crush injury to the lower extremity presents with localized tissue
death, bacterial infection, and a foul odor accompanied by gas bubbles under the skin.
Which condition is present?
A. Dry gangrene
B. Wet gangrene
C. Gas gangrene
D. Fibrinoid necrosis
Rationale: Gas gangrene is a specialized form of necrosis caused by anaerobic spore-forming
bacteria, such as Clostridium species, which produce toxins that destroy surrounding tissue
and release gas bubbles.
8. Apoptosis differs fundamentally from necrosis because apoptosis is characterized by
which of the following features?
A. Extensive inflammatory response surrounding destroyed cells
B. Controlled, energy-dependent programmed cell death without cell lysis
C. Passive cell rupture and leakage of cytosolic contents
D. Massive loss of membrane integrity leading to organelle swelling
Rationale: Apoptosis is an active, energy-dependent (ATP-dependent) process of
programmed cell death where cells shrink and fragment into apoptotic bodies that are
phagocytosed without eliciting an inflammatory response.
9. Which physiological mechanism directly accounts for the release of reactive oxygen
species (ROS) during reperfusion following a period of tissue ischemia?
, A. Complete shutdown of xanthine oxidase activity
B. Rapid restoration of oxygen supplying uncoupled mitochondrial respiratory chains
C. Immediate intracellular accumulation of protective antioxidants
D. Inhibition of neutrophils entering the damaged tissue site
Rationale: Ischemia-reperfusion injury occurs when reoxygenation supplies oxygen to
damaged mitochondria and enzymatic pathways, generating high concentrations of reactive
oxygen species (ROS) that cause secondary membrane damage.
10. Intracellular calcium accumulation during hypoxic cell injury promotes tissue
breakdown primarily by activating which group of enzymes?
A. Polymerases and transcriptases
B. Phospholipases, endonucleases, and proteases
C. Dehydrogenases and synthetases
D. Cyclooxygenases and lipoxygenases exclusively
Rationale: Excess intracellular calcium activates destructive enzymes including
phospholipases (which degrade membrane phospholipids), proteases (which disassemble
cytoskeletal proteins), and endonucleases (which fragment chromatin).
11. During acute inflammation, which vascular alteration immediately follows transient
vasoconstriction at the site of injury?
A. Arteriolar vasodilation causing hyperemic blood flow
B. Decreased microvascular permeability
C. Rapid endothelial cell contraction narrowing capillary beds
D. Decreased hydrostatic pressure within local venules
Rationale: Following brief arteriolar constriction, histamine and other mediators induce
prompt arteriolar vasodilation, increasing blood flow (hyperemia) to the injured area, causing
redness and heat.
12. Which inflammatory chemical mediator is principally responsible for early vascular
permeability and arteriolar vasodilation immediately after tissue trauma?
A. Leukotriene B4
