NR 507 Final Exam – Advanced Pathophysiology exam verified
with correct answers plus rationales 2026/2027 version
1. A patient with left-sided heart failure develops pulmonary crackles and dyspnea. Which
mechanism best explains these findings?
A. Increased systemic vascular resistance
B. Increased pulmonary venous pressure causing pulmonary edema
C. Decreased pulmonary blood flow
D. Increased renal perfusion
Answer: B. Increased pulmonary venous pressure causing pulmonary edema
Rationale: Left ventricular dysfunction causes blood to back up into the pulmonary circulation,
increasing pulmonary capillary hydrostatic pressure and promoting fluid movement into the
interstitium and alveoli.
2. Which mechanism is primarily responsible for edema in right-sided heart failure?
A. Pulmonary venous congestion
B. Systemic venous congestion
C. Decreased aldosterone secretion
D. Increased oncotic pressure
Answer: B. Systemic venous congestion
Rationale: Right-sided failure causes blood to accumulate in the systemic venous circulation,
producing peripheral edema, hepatomegaly, and jugular venous distention.
3. What is the primary pathophysiologic event in myocardial infarction?
A. Increased coronary blood flow
B. Prolonged myocardial ischemia resulting in cardiomyocyte injury and necrosis
C. Decreased sympathetic activity
D. Increased oxygen delivery to myocardium
Answer: B. Prolonged myocardial ischemia resulting in cardiomyocyte injury and necrosis
Rationale: Usually, an acute coronary artery obstruction reduces oxygen delivery. Prolonged
ischemia causes irreversible myocardial cell injury and necrosis.
,4. Which biomarker is particularly useful for detecting myocardial injury?
A. Troponin
B. Bilirubin
C. Amylase
D. Albumin
Answer: A. Troponin
Rationale: Cardiac troponins are highly sensitive and specific markers of myocardial injury.
5. Why does chronic hypertension cause left ventricular hypertrophy?
A. Reduced afterload
B. Increased pressure workload on the left ventricle
C. Reduced sympathetic activity
D. Increased coronary artery diameter
Answer: B. Increased pressure workload on the left ventricle
Rationale: Chronic systemic hypertension increases afterload. The left ventricle compensates by
increasing muscle mass, producing concentric hypertrophy.
6. Which change occurs during compensated shock?
A. Complete loss of tissue perfusion
B. Activation of sympathetic and hormonal mechanisms to maintain vital-organ perfusion
C. Permanent organ failure
D. Complete cessation of cardiac output
Answer: B. Activation of sympathetic and hormonal mechanisms to maintain vital-organ
perfusion
Rationale: Early shock activates sympathetic, renin-angiotensin-aldosterone, and other
compensatory mechanisms to preserve perfusion.
7. What is the fundamental abnormality in disseminated intravascular coagulation (DIC)?
,A. Complete absence of clotting factors
B. Widespread activation of coagulation causing microthrombi and consumption of platelets and
clotting factors
C. Isolated platelet production
D. Excess erythropoietin
Answer: B. Widespread activation of coagulation causing microthrombi and consumption
of platelets and clotting factors
Rationale: DIC simultaneously produces abnormal clot formation and consumption of
coagulation components, leading to both thrombosis and bleeding.
8. Which finding is most consistent with iron-deficiency anemia?
A. Macrocytic erythrocytes
B. Microcytic, hypochromic erythrocytes
C. Increased vitamin B12
D. Increased mean corpuscular volume
Answer: B. Microcytic, hypochromic erythrocytes
Rationale: Iron deficiency impairs hemoglobin synthesis, producing small, pale red blood cells.
9. Pernicious anemia results primarily from impaired absorption of:
A. Iron
B. Vitamin B12
C. Vitamin K
D. Folate
Answer: B. Vitamin B12
Rationale: Pernicious anemia involves autoimmune destruction or dysfunction of gastric parietal
cells, resulting in intrinsic-factor deficiency and impaired vitamin B12 absorption.
10. Which physiologic abnormality is characteristic of sickle cell disease?
A. Increased normal hemoglobin production
B. Polymerization of abnormal hemoglobin during low-oxygen conditions
, C. Excess platelet production
D. Increased erythrocyte flexibility
Answer: B. Polymerization of abnormal hemoglobin during low-oxygen conditions
Rationale: Hemoglobin S polymerizes during deoxygenation, causing erythrocyte sickling,
hemolysis, and microvascular obstruction.
11. What is the primary pathophysiologic defect in asthma?
A. Permanent destruction of alveoli
B. Reversible airway inflammation and bronchoconstriction with variable airflow obstruction
C. Pleural fluid accumulation
D. Loss of surfactant only
Answer: B. Reversible airway inflammation and bronchoconstriction with variable airflow
obstruction
Rationale: Asthma involves airway hyperresponsiveness, inflammation, mucus production, and
bronchoconstriction.
12. Which mechanism contributes significantly to emphysema?
A. Increased alveolar elastic recoil
B. Destruction of alveolar walls and loss of elastic recoil
C. Increased surfactant production
D. Increased alveolar surface area
Answer: B. Destruction of alveolar walls and loss of elastic recoil
Rationale: Emphysema destroys alveolar septa, reducing surface area for gas exchange and
causing loss of elastic recoil.
13. Why does emphysema cause air trapping?
A. Excessive airway cartilage
B. Loss of elastic recoil and small-airway collapse during expiration
C. Increased pulmonary surfactant
D. Increased respiratory muscle strength
with correct answers plus rationales 2026/2027 version
1. A patient with left-sided heart failure develops pulmonary crackles and dyspnea. Which
mechanism best explains these findings?
A. Increased systemic vascular resistance
B. Increased pulmonary venous pressure causing pulmonary edema
C. Decreased pulmonary blood flow
D. Increased renal perfusion
Answer: B. Increased pulmonary venous pressure causing pulmonary edema
Rationale: Left ventricular dysfunction causes blood to back up into the pulmonary circulation,
increasing pulmonary capillary hydrostatic pressure and promoting fluid movement into the
interstitium and alveoli.
2. Which mechanism is primarily responsible for edema in right-sided heart failure?
A. Pulmonary venous congestion
B. Systemic venous congestion
C. Decreased aldosterone secretion
D. Increased oncotic pressure
Answer: B. Systemic venous congestion
Rationale: Right-sided failure causes blood to accumulate in the systemic venous circulation,
producing peripheral edema, hepatomegaly, and jugular venous distention.
3. What is the primary pathophysiologic event in myocardial infarction?
A. Increased coronary blood flow
B. Prolonged myocardial ischemia resulting in cardiomyocyte injury and necrosis
C. Decreased sympathetic activity
D. Increased oxygen delivery to myocardium
Answer: B. Prolonged myocardial ischemia resulting in cardiomyocyte injury and necrosis
Rationale: Usually, an acute coronary artery obstruction reduces oxygen delivery. Prolonged
ischemia causes irreversible myocardial cell injury and necrosis.
,4. Which biomarker is particularly useful for detecting myocardial injury?
A. Troponin
B. Bilirubin
C. Amylase
D. Albumin
Answer: A. Troponin
Rationale: Cardiac troponins are highly sensitive and specific markers of myocardial injury.
5. Why does chronic hypertension cause left ventricular hypertrophy?
A. Reduced afterload
B. Increased pressure workload on the left ventricle
C. Reduced sympathetic activity
D. Increased coronary artery diameter
Answer: B. Increased pressure workload on the left ventricle
Rationale: Chronic systemic hypertension increases afterload. The left ventricle compensates by
increasing muscle mass, producing concentric hypertrophy.
6. Which change occurs during compensated shock?
A. Complete loss of tissue perfusion
B. Activation of sympathetic and hormonal mechanisms to maintain vital-organ perfusion
C. Permanent organ failure
D. Complete cessation of cardiac output
Answer: B. Activation of sympathetic and hormonal mechanisms to maintain vital-organ
perfusion
Rationale: Early shock activates sympathetic, renin-angiotensin-aldosterone, and other
compensatory mechanisms to preserve perfusion.
7. What is the fundamental abnormality in disseminated intravascular coagulation (DIC)?
,A. Complete absence of clotting factors
B. Widespread activation of coagulation causing microthrombi and consumption of platelets and
clotting factors
C. Isolated platelet production
D. Excess erythropoietin
Answer: B. Widespread activation of coagulation causing microthrombi and consumption
of platelets and clotting factors
Rationale: DIC simultaneously produces abnormal clot formation and consumption of
coagulation components, leading to both thrombosis and bleeding.
8. Which finding is most consistent with iron-deficiency anemia?
A. Macrocytic erythrocytes
B. Microcytic, hypochromic erythrocytes
C. Increased vitamin B12
D. Increased mean corpuscular volume
Answer: B. Microcytic, hypochromic erythrocytes
Rationale: Iron deficiency impairs hemoglobin synthesis, producing small, pale red blood cells.
9. Pernicious anemia results primarily from impaired absorption of:
A. Iron
B. Vitamin B12
C. Vitamin K
D. Folate
Answer: B. Vitamin B12
Rationale: Pernicious anemia involves autoimmune destruction or dysfunction of gastric parietal
cells, resulting in intrinsic-factor deficiency and impaired vitamin B12 absorption.
10. Which physiologic abnormality is characteristic of sickle cell disease?
A. Increased normal hemoglobin production
B. Polymerization of abnormal hemoglobin during low-oxygen conditions
, C. Excess platelet production
D. Increased erythrocyte flexibility
Answer: B. Polymerization of abnormal hemoglobin during low-oxygen conditions
Rationale: Hemoglobin S polymerizes during deoxygenation, causing erythrocyte sickling,
hemolysis, and microvascular obstruction.
11. What is the primary pathophysiologic defect in asthma?
A. Permanent destruction of alveoli
B. Reversible airway inflammation and bronchoconstriction with variable airflow obstruction
C. Pleural fluid accumulation
D. Loss of surfactant only
Answer: B. Reversible airway inflammation and bronchoconstriction with variable airflow
obstruction
Rationale: Asthma involves airway hyperresponsiveness, inflammation, mucus production, and
bronchoconstriction.
12. Which mechanism contributes significantly to emphysema?
A. Increased alveolar elastic recoil
B. Destruction of alveolar walls and loss of elastic recoil
C. Increased surfactant production
D. Increased alveolar surface area
Answer: B. Destruction of alveolar walls and loss of elastic recoil
Rationale: Emphysema destroys alveolar septa, reducing surface area for gas exchange and
causing loss of elastic recoil.
13. Why does emphysema cause air trapping?
A. Excessive airway cartilage
B. Loss of elastic recoil and small-airway collapse during expiration
C. Increased pulmonary surfactant
D. Increased respiratory muscle strength
