HSC 4558 Exam 4 V1 | HSC 4558 Pathophysiology II | Actual Q&A with
Rationale (HSC4558 Exam 4) | University of Central Florida
1. A patient presents with persistent airway inflammation, mucus hypersecretion, and a
productive cough lasting at least three months for two consecutive years. Which condition is
most likely?
A. Extrinsic Asthma
B. Emphysema
C. Chronic Bronchitis
D. Pneumonia
Answer: C
Explanation: Chronic bronchitis is clinically defined by a chronic productive cough for at
least three months in two consecutive years. It involves the hypertrophy of mucus-
secreting glands in the large airways and chronic inflammation. This differs from
emphysema, which focuses on alveolar destruction rather than airway obstruction via
mucus.
2. In the context of Chronic Obstructive Pulmonary Disease (COPD), what is the primary
pathophysiological mechanism of emphysema?
A. Bronchoconstriction due to hyperresponsiveness
B. Infiltration of the pleural space with fluid
C. Reversible obstruction of the bronchioles
D. Permanent enlargement of gas-exchange airways and destruction of alveolar walls
Answer: D
Explanation: Emphysema involves the destruction of alveolar septa and loss of elastic
recoil, leading to air trapping. The primary cause is often an imbalance between proteases
and antiproteases, frequently triggered by smoking. This results in the collapse of small
airways during expiration, characteristic of the ‘pink puffer’ phenotype.
3. A 25-year-old patient experiences bronchospasms triggered by pollen. This type of asthma
is best categorized as:
A. Intrinsic asthma
B. Occupational asthma
C. Exercise-induced asthma
D. Extrinsic (Atopic) asthma
,Answer: D
Explanation: Extrinsic or atopic asthma is triggered by environmental allergens such as
pollen, pet dander, or dust mites. It is a Type I hypersensitivity reaction mediated by IgE
antibodies. Exposure to the allergen causes mast cell degranulation and the release of
inflammatory mediators like histamine.
4. What is the hallmark physiological finding in Acute Respiratory Distress Syndrome (ARDS)?
A. Increased lung compliance
B. Decreased pulmonary artery pressure
C. Severe hypoxemia that is refractory to oxygen therapy
D. Alveolar hyperventilation and hypocapnia
Answer: C
Explanation: ARDS is characterized by widespread alveolar-capillary membrane damage
leading to non-cardiogenic pulmonary edema. The resulting shunting and impaired gas
exchange cause hypoxemia that does not respond significantly to increased concentrations
of inspired oxygen. The formation of hyaline membranes is a classic histological feature of
this syndrome.
5. Virchow’s Triad describes the primary factors contributing to venous thrombosis. Which of
the following is NOT part of the triad?
A. Venous stasis
B. Hypercoagulability
C. Endothelial injury
D. High arterial blood pressure
Answer: D
Explanation: Virchow’s Triad includes endothelial injury, stasis of blood flow, and
hypercoagulability. These three factors significantly increase the risk of developing a Deep
Vein Thrombosis (DVT), which can lead to a Pulmonary Embolism. Hypertension is a risk
factor for arterial disease but is not a component of this specific triad for venous clots.
6. A patient with a tension pneumothorax is at risk for sudden death due to which
mechanism?
A. Excessive surfactant production
B. Fluid accumulation in the pleural space
C. Rupture of the visceral pleura causing air to leave the lung
D. Mediastinal shift compressing the heart and great vessels
, Answer: D
Explanation: In a tension pneumothorax, air enters the pleural space during inspiration
but cannot escape during expiration. This buildup of pressure causes the mediastinum to
shift toward the unaffected side, compressing the heart and vena cava. This leads to
decreased venous return and a life-threatening drop in cardiac output.
7. Which deficiency is a genetic risk factor for developing early-onset emphysema, especially
in non-smokers?
A. Alpha-1 antitrypsin deficiency
B. Cystic fibrosis transmembrane regulator deficiency
C. Surfactant protein B deficiency
D. Immunoglobulin A deficiency
Answer: A
Explanation: Alpha-1 antitrypsin is a protein that protects the lungs from being damaged
by neutrophil elastase. A genetic deficiency in this protein allows elastase to break down
alveolar walls unchecked, leading to panacinar emphysema. This condition should be
suspected in young patients presenting with COPD symptoms who have no smoking
history.
8. Which organism is the most common cause of community-acquired pneumonia (CAP)?
A. Staphylococcus aureus
B. Streptococcus pneumoniae
C. Klebsiella pneumoniae
D. Mycoplasma pneumoniae
Answer: B
Explanation: Streptococcus pneumoniae, also known as the pneumococcus, is the leading
cause of bacterial pneumonia worldwide. It typically presents with sudden onset of fever,
chills, and rust-colored sputum. Vaccination programs have helped reduce the incidence,
but it remains a significant pathogen in clinical settings.
9. Cystic Fibrosis is caused by a mutation in a gene that encodes for a protein involved in the
transport of:
A. Chloride
B. Potassium
C. Sodium
D. Calcium
Rationale (HSC4558 Exam 4) | University of Central Florida
1. A patient presents with persistent airway inflammation, mucus hypersecretion, and a
productive cough lasting at least three months for two consecutive years. Which condition is
most likely?
A. Extrinsic Asthma
B. Emphysema
C. Chronic Bronchitis
D. Pneumonia
Answer: C
Explanation: Chronic bronchitis is clinically defined by a chronic productive cough for at
least three months in two consecutive years. It involves the hypertrophy of mucus-
secreting glands in the large airways and chronic inflammation. This differs from
emphysema, which focuses on alveolar destruction rather than airway obstruction via
mucus.
2. In the context of Chronic Obstructive Pulmonary Disease (COPD), what is the primary
pathophysiological mechanism of emphysema?
A. Bronchoconstriction due to hyperresponsiveness
B. Infiltration of the pleural space with fluid
C. Reversible obstruction of the bronchioles
D. Permanent enlargement of gas-exchange airways and destruction of alveolar walls
Answer: D
Explanation: Emphysema involves the destruction of alveolar septa and loss of elastic
recoil, leading to air trapping. The primary cause is often an imbalance between proteases
and antiproteases, frequently triggered by smoking. This results in the collapse of small
airways during expiration, characteristic of the ‘pink puffer’ phenotype.
3. A 25-year-old patient experiences bronchospasms triggered by pollen. This type of asthma
is best categorized as:
A. Intrinsic asthma
B. Occupational asthma
C. Exercise-induced asthma
D. Extrinsic (Atopic) asthma
,Answer: D
Explanation: Extrinsic or atopic asthma is triggered by environmental allergens such as
pollen, pet dander, or dust mites. It is a Type I hypersensitivity reaction mediated by IgE
antibodies. Exposure to the allergen causes mast cell degranulation and the release of
inflammatory mediators like histamine.
4. What is the hallmark physiological finding in Acute Respiratory Distress Syndrome (ARDS)?
A. Increased lung compliance
B. Decreased pulmonary artery pressure
C. Severe hypoxemia that is refractory to oxygen therapy
D. Alveolar hyperventilation and hypocapnia
Answer: C
Explanation: ARDS is characterized by widespread alveolar-capillary membrane damage
leading to non-cardiogenic pulmonary edema. The resulting shunting and impaired gas
exchange cause hypoxemia that does not respond significantly to increased concentrations
of inspired oxygen. The formation of hyaline membranes is a classic histological feature of
this syndrome.
5. Virchow’s Triad describes the primary factors contributing to venous thrombosis. Which of
the following is NOT part of the triad?
A. Venous stasis
B. Hypercoagulability
C. Endothelial injury
D. High arterial blood pressure
Answer: D
Explanation: Virchow’s Triad includes endothelial injury, stasis of blood flow, and
hypercoagulability. These three factors significantly increase the risk of developing a Deep
Vein Thrombosis (DVT), which can lead to a Pulmonary Embolism. Hypertension is a risk
factor for arterial disease but is not a component of this specific triad for venous clots.
6. A patient with a tension pneumothorax is at risk for sudden death due to which
mechanism?
A. Excessive surfactant production
B. Fluid accumulation in the pleural space
C. Rupture of the visceral pleura causing air to leave the lung
D. Mediastinal shift compressing the heart and great vessels
, Answer: D
Explanation: In a tension pneumothorax, air enters the pleural space during inspiration
but cannot escape during expiration. This buildup of pressure causes the mediastinum to
shift toward the unaffected side, compressing the heart and vena cava. This leads to
decreased venous return and a life-threatening drop in cardiac output.
7. Which deficiency is a genetic risk factor for developing early-onset emphysema, especially
in non-smokers?
A. Alpha-1 antitrypsin deficiency
B. Cystic fibrosis transmembrane regulator deficiency
C. Surfactant protein B deficiency
D. Immunoglobulin A deficiency
Answer: A
Explanation: Alpha-1 antitrypsin is a protein that protects the lungs from being damaged
by neutrophil elastase. A genetic deficiency in this protein allows elastase to break down
alveolar walls unchecked, leading to panacinar emphysema. This condition should be
suspected in young patients presenting with COPD symptoms who have no smoking
history.
8. Which organism is the most common cause of community-acquired pneumonia (CAP)?
A. Staphylococcus aureus
B. Streptococcus pneumoniae
C. Klebsiella pneumoniae
D. Mycoplasma pneumoniae
Answer: B
Explanation: Streptococcus pneumoniae, also known as the pneumococcus, is the leading
cause of bacterial pneumonia worldwide. It typically presents with sudden onset of fever,
chills, and rust-colored sputum. Vaccination programs have helped reduce the incidence,
but it remains a significant pathogen in clinical settings.
9. Cystic Fibrosis is caused by a mutation in a gene that encodes for a protein involved in the
transport of:
A. Chloride
B. Potassium
C. Sodium
D. Calcium
