NR507 ADVANCED
PATHOPHYSIOLOGY PRACTICE EXAM
QUESTIONS AND VERIFIED ANSWERS |
100% CORRECT | GRADE A+
1. During reperfusion injury, the restoration of oxygen leads to the formation of reactive
oxygen species (ROS). Which mechanism primarily explains how ROS damage the cell?
A. Stabilization of lysosomal membranes
B. Inhibition of DNA polymerase
C. Lipid peroxidation of membranes
D. Decrease in intracellular calcium levels
Answer: C
Conceptual Explanation: Reactive oxygen species cause cellular damage primarily
through lipid peroxidation, which destroys the unsaturated fatty acids in cell membranes,
leading to increased permeability and cell death.
2. In the context of fluid and electrolyte balance, which hormone is primarily responsible for
the reabsorption of water independently of sodium in the collecting ducts?
A. Antidiuretic Hormone (ADH)
B. Aldosterone
,C. Atrial Natriuretic Peptide (ANP)
D. Angiotensin II
Answer: A
Conceptual Explanation: ADH acts on the V2 receptors in the collecting ducts to increase
water permeability through aquaporin channels, whereas aldosterone promotes sodium
reabsorption.
3. A patient presents with a pH of 7.25, a pCO2 of 55 mmHg, and a HCO3- of 26 mEq/L. Which
acid-base imbalance is occurring?
A. Metabolic Acidosis
B. Metabolic Alkalosis
C. Respiratory Acidosis
D. Respiratory Alkalosis
Answer: C
Conceptual Explanation: A pH below 7.35 indicates acidosis. A high pCO2 (>45) suggests
a respiratory origin, and the relatively normal/slightly high HCO3 indicates the body hasn’t
fully compensated yet.
4. Which type of hypersensitivity reaction involves the formation of immune complexes that
are deposited in vessel walls or extravascular tissues?
A. Type I
, B. Type III
C. Type II
D. Type IV
Answer: B
Conceptual Explanation: Type III hypersensitivity is mediated by immune complexes
(antigen-antibody) that circulate and deposit in tissues, triggering inflammation via
complement activation.
5. In the pathogenesis of atherosclerosis, which cell type is responsible for the formation of
‘foam cells’ after engulfing oxidized LDL?
A. Macrophages
B. Endothelial cells
C. Smooth muscle cells
D. Neutrophils
Answer: A
Conceptual Explanation: Macrophages migrate into the subendothelial space and ingest
oxidized LDL, transforming into lipid-laden foam cells that contribute to the fatty streak.
6. Which clinical manifestation is a hallmark of Right Heart Failure as opposed to Left Heart
Failure?
A. Pulmonary edema
PATHOPHYSIOLOGY PRACTICE EXAM
QUESTIONS AND VERIFIED ANSWERS |
100% CORRECT | GRADE A+
1. During reperfusion injury, the restoration of oxygen leads to the formation of reactive
oxygen species (ROS). Which mechanism primarily explains how ROS damage the cell?
A. Stabilization of lysosomal membranes
B. Inhibition of DNA polymerase
C. Lipid peroxidation of membranes
D. Decrease in intracellular calcium levels
Answer: C
Conceptual Explanation: Reactive oxygen species cause cellular damage primarily
through lipid peroxidation, which destroys the unsaturated fatty acids in cell membranes,
leading to increased permeability and cell death.
2. In the context of fluid and electrolyte balance, which hormone is primarily responsible for
the reabsorption of water independently of sodium in the collecting ducts?
A. Antidiuretic Hormone (ADH)
B. Aldosterone
,C. Atrial Natriuretic Peptide (ANP)
D. Angiotensin II
Answer: A
Conceptual Explanation: ADH acts on the V2 receptors in the collecting ducts to increase
water permeability through aquaporin channels, whereas aldosterone promotes sodium
reabsorption.
3. A patient presents with a pH of 7.25, a pCO2 of 55 mmHg, and a HCO3- of 26 mEq/L. Which
acid-base imbalance is occurring?
A. Metabolic Acidosis
B. Metabolic Alkalosis
C. Respiratory Acidosis
D. Respiratory Alkalosis
Answer: C
Conceptual Explanation: A pH below 7.35 indicates acidosis. A high pCO2 (>45) suggests
a respiratory origin, and the relatively normal/slightly high HCO3 indicates the body hasn’t
fully compensated yet.
4. Which type of hypersensitivity reaction involves the formation of immune complexes that
are deposited in vessel walls or extravascular tissues?
A. Type I
, B. Type III
C. Type II
D. Type IV
Answer: B
Conceptual Explanation: Type III hypersensitivity is mediated by immune complexes
(antigen-antibody) that circulate and deposit in tissues, triggering inflammation via
complement activation.
5. In the pathogenesis of atherosclerosis, which cell type is responsible for the formation of
‘foam cells’ after engulfing oxidized LDL?
A. Macrophages
B. Endothelial cells
C. Smooth muscle cells
D. Neutrophils
Answer: A
Conceptual Explanation: Macrophages migrate into the subendothelial space and ingest
oxidized LDL, transforming into lipid-laden foam cells that contribute to the fatty streak.
6. Which clinical manifestation is a hallmark of Right Heart Failure as opposed to Left Heart
Failure?
A. Pulmonary edema
