HSC 4555 Exam 1 V2 | HSC 4555 Pathophysiology 1 | Actual Q&A with
Rationale (HSC4555 Exam 1) | University of Central Florida
1. A 55-year-old male with a history of smoking presents for a routine checkup. A biopsy of
his bronchial epithelium reveals that the normal ciliated columnar cells have been replaced
by stratified squamous cells. This is an example of which cellular adaptation?
A. Atrophy
B. Metaplasia
C. Hypertrophy
D. Dysplasia
Answer: B
Explanation: Metaplasia is a reversible change in which one adult cell type is replaced by
another adult cell type. This usually occurs in response to chronic irritation, such as
cigarette smoke in the lungs. While the new cell type is better suited for the environment, it
often loses specialized functions like mucus secretion and ciliary action.
2. Which of the following processes is characterized by the programmed death of a cell
without the release of inflammatory mediators?
A. Coagulative necrosis
B. Liquefactive necrosis
C. Apoptosis
D. Autolysis
Answer: C
Explanation: Apoptosis is a highly regulated form of cell death that is often referred to as
programmed cell death. Unlike necrosis, it does not involve the rupture of the cell
membrane or the release of intracellular contents that trigger inflammation. It is essential
for normal development and the elimination of damaged or potentially harmful cells.
3. A patient suffers a myocardial infarction due to a blocked coronary artery. Which type of
necrosis is most commonly associated with hypoxic injury in the heart?
A. Liquefactive necrosis
B. Caseous necrosis
C. Coagulative necrosis
D. Fat necrosis
,Answer: C
Explanation: Coagulative necrosis is the most common type of necrosis resulting from
ischemia or infarction in solid organs like the heart, kidneys, and spleen. The structural
proteins and enzymes are denatured, preserving the basic architecture of the tissue for
several days. Eventually, the dead cells are removed by phagocytosis.
4. Which type of necrosis is typically seen in the brain following a hypoxic or ischemic event?
A. Coagulative necrosis
B. Fibrinoid necrosis
C. Liquefactive necrosis
D. Caseous necrosis
Answer: C
Explanation: Liquefactive necrosis occurs in the central nervous system because brain
tissue contains high amounts of lipids and lysosomal enzymes. The dead tissue is rapidly
digested into a liquid viscous mass, forming an abscess or cyst. This differs from
coagulative necrosis, which is more common in other solid visceral organs.
5. During an inflammatory response, which chemical mediator is primarily responsible for
increasing vascular permeability and causing vasodilation immediately after injury?
A. Leukotrienes
B. Histamine
C. Cytokines
D. Complement proteins
Answer: B
Explanation: Histamine is one of the first mediators released during the acute
inflammatory response, primarily from mast cells. It acts quickly to dilate arterioles and
increase the permeability of venules, leading to redness and swelling. Its effects are
relatively short-lived compared to other mediators like leukotrienes.
6. A patient presents with signs of local inflammation including redness, heat, and swelling.
What is the physiological basis for the ‘heat’ (calor) associated with inflammation?
A. Increased metabolic activity of leukocytes
B. Release of pyrogens affecting the hypothalamus
C. Activation of the complement cascade
D. Increased blood flow to the injured area
Answer: D
, Explanation: Calor, or heat, is caused by vasodilation and increased blood flow to the site
of injury. This increased perfusion brings warmer blood from the body’s core to the
superficial tissues. It is one of the four cardinal signs of inflammation described by Celsus.
7. In the context of fluid balance, which force is primarily responsible for pulling water back
into the capillary from the interstitial space?
A. Capillary hydrostatic pressure
B. Capillary oncotic pressure
C. Interstitial hydrostatic pressure
D. Interstitial oncotic pressure
Answer: B
Explanation: Capillary oncotic (or colloid osmotic) pressure is generated primarily by
plasma proteins like albumin. These proteins are too large to pass through the capillary
wall and thus exert a pull that draws water back into the vascular compartment. This force
opposes hydrostatic pressure, which pushes fluid out.
8. A patient with liver failure develops significant peripheral edema. What is the most likely
underlying mechanism for this edema?
A. Increased capillary hydrostatic pressure
B. Decreased plasma oncotic pressure
C. Increased interstitial oncotic pressure
D. Lymphatic obstruction
Answer: B
Explanation: The liver is responsible for synthesizing albumin, the main protein that
maintains plasma oncotic pressure. In liver failure, albumin production decreases, leading
to a drop in oncotic pressure that allows fluid to escape into the interstitium. This results in
generalized edema and ascites.
9. Which electrolyte imbalance is most likely to cause clinical manifestations such as flattened
T-waves and the presence of U-waves on an ECG?
A. Hyperkalemia
B. Hyponatremia
C. Hypokalemia
D. Hypercalcemia
Answer: C
Rationale (HSC4555 Exam 1) | University of Central Florida
1. A 55-year-old male with a history of smoking presents for a routine checkup. A biopsy of
his bronchial epithelium reveals that the normal ciliated columnar cells have been replaced
by stratified squamous cells. This is an example of which cellular adaptation?
A. Atrophy
B. Metaplasia
C. Hypertrophy
D. Dysplasia
Answer: B
Explanation: Metaplasia is a reversible change in which one adult cell type is replaced by
another adult cell type. This usually occurs in response to chronic irritation, such as
cigarette smoke in the lungs. While the new cell type is better suited for the environment, it
often loses specialized functions like mucus secretion and ciliary action.
2. Which of the following processes is characterized by the programmed death of a cell
without the release of inflammatory mediators?
A. Coagulative necrosis
B. Liquefactive necrosis
C. Apoptosis
D. Autolysis
Answer: C
Explanation: Apoptosis is a highly regulated form of cell death that is often referred to as
programmed cell death. Unlike necrosis, it does not involve the rupture of the cell
membrane or the release of intracellular contents that trigger inflammation. It is essential
for normal development and the elimination of damaged or potentially harmful cells.
3. A patient suffers a myocardial infarction due to a blocked coronary artery. Which type of
necrosis is most commonly associated with hypoxic injury in the heart?
A. Liquefactive necrosis
B. Caseous necrosis
C. Coagulative necrosis
D. Fat necrosis
,Answer: C
Explanation: Coagulative necrosis is the most common type of necrosis resulting from
ischemia or infarction in solid organs like the heart, kidneys, and spleen. The structural
proteins and enzymes are denatured, preserving the basic architecture of the tissue for
several days. Eventually, the dead cells are removed by phagocytosis.
4. Which type of necrosis is typically seen in the brain following a hypoxic or ischemic event?
A. Coagulative necrosis
B. Fibrinoid necrosis
C. Liquefactive necrosis
D. Caseous necrosis
Answer: C
Explanation: Liquefactive necrosis occurs in the central nervous system because brain
tissue contains high amounts of lipids and lysosomal enzymes. The dead tissue is rapidly
digested into a liquid viscous mass, forming an abscess or cyst. This differs from
coagulative necrosis, which is more common in other solid visceral organs.
5. During an inflammatory response, which chemical mediator is primarily responsible for
increasing vascular permeability and causing vasodilation immediately after injury?
A. Leukotrienes
B. Histamine
C. Cytokines
D. Complement proteins
Answer: B
Explanation: Histamine is one of the first mediators released during the acute
inflammatory response, primarily from mast cells. It acts quickly to dilate arterioles and
increase the permeability of venules, leading to redness and swelling. Its effects are
relatively short-lived compared to other mediators like leukotrienes.
6. A patient presents with signs of local inflammation including redness, heat, and swelling.
What is the physiological basis for the ‘heat’ (calor) associated with inflammation?
A. Increased metabolic activity of leukocytes
B. Release of pyrogens affecting the hypothalamus
C. Activation of the complement cascade
D. Increased blood flow to the injured area
Answer: D
, Explanation: Calor, or heat, is caused by vasodilation and increased blood flow to the site
of injury. This increased perfusion brings warmer blood from the body’s core to the
superficial tissues. It is one of the four cardinal signs of inflammation described by Celsus.
7. In the context of fluid balance, which force is primarily responsible for pulling water back
into the capillary from the interstitial space?
A. Capillary hydrostatic pressure
B. Capillary oncotic pressure
C. Interstitial hydrostatic pressure
D. Interstitial oncotic pressure
Answer: B
Explanation: Capillary oncotic (or colloid osmotic) pressure is generated primarily by
plasma proteins like albumin. These proteins are too large to pass through the capillary
wall and thus exert a pull that draws water back into the vascular compartment. This force
opposes hydrostatic pressure, which pushes fluid out.
8. A patient with liver failure develops significant peripheral edema. What is the most likely
underlying mechanism for this edema?
A. Increased capillary hydrostatic pressure
B. Decreased plasma oncotic pressure
C. Increased interstitial oncotic pressure
D. Lymphatic obstruction
Answer: B
Explanation: The liver is responsible for synthesizing albumin, the main protein that
maintains plasma oncotic pressure. In liver failure, albumin production decreases, leading
to a drop in oncotic pressure that allows fluid to escape into the interstitium. This results in
generalized edema and ascites.
9. Which electrolyte imbalance is most likely to cause clinical manifestations such as flattened
T-waves and the presence of U-waves on an ECG?
A. Hyperkalemia
B. Hyponatremia
C. Hypokalemia
D. Hypercalcemia
Answer: C
