NR-283 Exam 3: Pathophysiology V3 Updated and Latest
Questions and Correct Answers with Rationale -
Chamberlain University
1. Which clinical manifestation is most characteristic of Acute Respiratory Distress Syndrome
(ARDS)?
A. Severe hypoxemia refractory to oxygen therapy
B. Productive cough with yellow sputum
C. Increased compliance of the lung tissue
D. Bradycardia and hypertension
Ans: A
Rationale: ARDS is defined by acute respiratory failure with severe hypoxemia that does not improve
with supplemental oxygen. The pathophysiology involves massive inflammation and alveolar-capillary
membrane damage. This damage leads to pulmonary edema and surfactant inactivation. Consequently,
the lungs become stiff and difficult to ventilate. Patients often require mechanical ventilation to maintain
adequate gas exchange. Recognizing this refractory nature is critical for emergency intervention.
,2. What is the primary underlying mechanism of emphysema?
A. Hypertrophy of mucus-secreting glands
B. Destruction of alveolar walls and loss of elastic recoil
C. Reversible bronchospasm after exposure to allergens
D. Fluid accumulation in the pleural space
Ans: B
Rationale: Emphysema is characterized by the permanent enlargement of gas-exchange airways. It
results from the destruction of alveolar walls due to imbalances in protease activities. This loss of tissue
reduces the elastic recoil necessary for expiration. Chronic smoking is the most common cause of this
progressive lung damage. It leads to air trapping and the classic barrel chest appearance. Understanding
this mechanism helps distinguish it from chronic bronchitis.
3. In the pathophysiology of asthma, what occurs during the early phase response?
A. IgE-mediated mast cell degranulation and bronchoconstriction
B. Permanent remodeling of the airway basement membrane
C. Infiltration of eosinophils and neutrophils into the tissue
D. Decreased mucus production in the bronchioles
Ans: A
Rationale: The early phase of asthma occurs within minutes of allergen exposure. It is primarily driven
by IgE antibodies binding to mast cells. This triggers the release of histamine and other inflammatory
mediators. These mediators cause immediate smooth muscle contraction and airway narrowing. Mucus
,production also increases during this rapid inflammatory cascade. Effective management usually involves
quick-relief bronchodilators to reverse these effects.
4. Which of the following describes the pathophysiology of Chronic Bronchitis?
A. Dilation of the bronchioles due to chronic infection
B. Genetic deficiency of alpha-1 antitrypsin
C. Autoimmune destruction of the parietal cells in the stomach
D. Hypersecretion of mucus and chronic productive cough
Ans: D
Rationale: Chronic bronchitis is defined clinically by a persistent productive cough. The condition
involves the hypersecretion of mucus from enlarged bronchial glands. Inflammation causes the bronchial
walls to thicken and narrow the airways. It is often triggered by long-term exposure to inhaled irritants
like cigarette smoke. This chronic irritation leads to squamous metaplasia of the ciliary lining.
Maintaining airway patency is a major challenge in these patients.
5. A patient with a pulmonary embolism likely suffers from which type of V/Q mismatch?
A. High V/Q ratio (dead space)
B. Low V/Q ratio (shunting)
C. Normal V/Q ratio
D. Total absence of ventilation with normal perfusion
Ans: A
, Rationale: Pulmonary embolism creates an area of the lung that is ventilated but not perfused. This
condition is referred to as alveolar dead space. Because blood flow is blocked, oxygen cannot enter the
bloodstream efficiently. This results in a high ventilation-to-perfusion (V/Q) ratio. The patient may
exhibit sudden onset chest pain and shortness of breath. Treatment focuses on restoring blood flow
through anticoagulation or thrombolytics.
6. What is the hallmark physiological defect in Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Absolute insulin deficiency due to beta-cell destruction
C. Excessive production of glucagon from the liver
D. Decreased glucose absorption in the small intestine
Ans: B
Rationale: Type 1 Diabetes Mellitus results from an autoimmune-mediated attack on the pancreas.
Specifically, the insulin-producing beta cells in the islets of Langerhans are destroyed. This leads to a total
lack of endogenous insulin production. Without insulin, glucose cannot enter cells for energy metabolism.
Genetic predisposition and environmental triggers are believed to cause this response. Patients must rely
on exogenous insulin for survival and glucose control.
Questions and Correct Answers with Rationale -
Chamberlain University
1. Which clinical manifestation is most characteristic of Acute Respiratory Distress Syndrome
(ARDS)?
A. Severe hypoxemia refractory to oxygen therapy
B. Productive cough with yellow sputum
C. Increased compliance of the lung tissue
D. Bradycardia and hypertension
Ans: A
Rationale: ARDS is defined by acute respiratory failure with severe hypoxemia that does not improve
with supplemental oxygen. The pathophysiology involves massive inflammation and alveolar-capillary
membrane damage. This damage leads to pulmonary edema and surfactant inactivation. Consequently,
the lungs become stiff and difficult to ventilate. Patients often require mechanical ventilation to maintain
adequate gas exchange. Recognizing this refractory nature is critical for emergency intervention.
,2. What is the primary underlying mechanism of emphysema?
A. Hypertrophy of mucus-secreting glands
B. Destruction of alveolar walls and loss of elastic recoil
C. Reversible bronchospasm after exposure to allergens
D. Fluid accumulation in the pleural space
Ans: B
Rationale: Emphysema is characterized by the permanent enlargement of gas-exchange airways. It
results from the destruction of alveolar walls due to imbalances in protease activities. This loss of tissue
reduces the elastic recoil necessary for expiration. Chronic smoking is the most common cause of this
progressive lung damage. It leads to air trapping and the classic barrel chest appearance. Understanding
this mechanism helps distinguish it from chronic bronchitis.
3. In the pathophysiology of asthma, what occurs during the early phase response?
A. IgE-mediated mast cell degranulation and bronchoconstriction
B. Permanent remodeling of the airway basement membrane
C. Infiltration of eosinophils and neutrophils into the tissue
D. Decreased mucus production in the bronchioles
Ans: A
Rationale: The early phase of asthma occurs within minutes of allergen exposure. It is primarily driven
by IgE antibodies binding to mast cells. This triggers the release of histamine and other inflammatory
mediators. These mediators cause immediate smooth muscle contraction and airway narrowing. Mucus
,production also increases during this rapid inflammatory cascade. Effective management usually involves
quick-relief bronchodilators to reverse these effects.
4. Which of the following describes the pathophysiology of Chronic Bronchitis?
A. Dilation of the bronchioles due to chronic infection
B. Genetic deficiency of alpha-1 antitrypsin
C. Autoimmune destruction of the parietal cells in the stomach
D. Hypersecretion of mucus and chronic productive cough
Ans: D
Rationale: Chronic bronchitis is defined clinically by a persistent productive cough. The condition
involves the hypersecretion of mucus from enlarged bronchial glands. Inflammation causes the bronchial
walls to thicken and narrow the airways. It is often triggered by long-term exposure to inhaled irritants
like cigarette smoke. This chronic irritation leads to squamous metaplasia of the ciliary lining.
Maintaining airway patency is a major challenge in these patients.
5. A patient with a pulmonary embolism likely suffers from which type of V/Q mismatch?
A. High V/Q ratio (dead space)
B. Low V/Q ratio (shunting)
C. Normal V/Q ratio
D. Total absence of ventilation with normal perfusion
Ans: A
, Rationale: Pulmonary embolism creates an area of the lung that is ventilated but not perfused. This
condition is referred to as alveolar dead space. Because blood flow is blocked, oxygen cannot enter the
bloodstream efficiently. This results in a high ventilation-to-perfusion (V/Q) ratio. The patient may
exhibit sudden onset chest pain and shortness of breath. Treatment focuses on restoring blood flow
through anticoagulation or thrombolytics.
6. What is the hallmark physiological defect in Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Absolute insulin deficiency due to beta-cell destruction
C. Excessive production of glucagon from the liver
D. Decreased glucose absorption in the small intestine
Ans: B
Rationale: Type 1 Diabetes Mellitus results from an autoimmune-mediated attack on the pancreas.
Specifically, the insulin-producing beta cells in the islets of Langerhans are destroyed. This leads to a total
lack of endogenous insulin production. Without insulin, glucose cannot enter cells for energy metabolism.
Genetic predisposition and environmental triggers are believed to cause this response. Patients must rely
on exogenous insulin for survival and glucose control.
