NR507 ADVANCED
PATHOPHYSIOLOGY FINAL
COMPREHENSIVE EXAM QUESTIONS
AND ANSWERS
1. A patient presents with massive proteinuria, hypoalbuminemia, and generalized edema.
Which of the following is the most likely underlying pathophysiological mechanism?
A. Inflammatory damage to the basement membrane causing hematuria
B. Immune complex deposition leading to a decrease in GFR
C. Obstruction of the renal tubules by cast proteins
D. Increased glomerular permeability to plasma proteins due to podocyte injury
Answer: D
Conceptual Explanation: Nephrotic syndrome is characterized by massive proteinuria
due to increased glomerular permeability, often resulting from podocyte injury or
effacement, which allows proteins to leak into the filtrate.
2. In Myasthenia Gravis, the progressive muscle weakness is primarily caused by which
mechanism?
A. Demyelination of the peripheral motor nerves
,B. Reduced synthesis of dopamine in the substantia nigra
C. Autoantibody-mediated destruction of acetylcholine receptors at the neuromuscular
junction
D. Hyper-excitability of the motor cortex neurons
Answer: C
Conceptual Explanation: Myasthenia Gravis is an autoimmune disorder where antibodies
attack or block acetylcholine receptors at the neuromuscular junction, impairing signal
transmission to muscles.
3. Chronic activation of the renin-angiotensin-aldosterone system (RAAS) in heart failure
leads to which of the following deleterious effects?
A. Vasodilation and sodium excretion
B. Improved renal perfusion and decreased cardiac workload
C. Decreased secretion of B-type natriuretic peptide (BNP)
D. Myocardial remodeling and increased ventricular afterload
Answer: D
Conceptual Explanation: While RAAS initially maintains blood pressure, chronic
activation leads to persistent vasoconstriction (increased afterload), fluid retention, and
myocardial fibrosis/remodeling, worsening heart failure.
, 4. Which clinical finding is characteristic of the Syndrome of Inappropriate Antidiuretic
Hormone (SIADH)?
A. Hypernatremia and low urine specific gravity
B. Dehydration and polyuria
C. Hyponatremia and high urine osmolality
D. Increased serum osmolality and hyperkalemia
Answer: C
Conceptual Explanation: SIADH involves excessive ADH release, leading to water
retention, dilutional hyponatremia, and highly concentrated urine despite normal or
increased intravascular volume.
5. What is the primary pathophysiological defect in Sickle Cell Disease?
A. A deficiency in the production of alpha-globin chains
B. A single amino acid substitution in the beta-globin chain causing hemoglobin
polymerization
C. The absence of glucose-6-phosphate dehydrogenase
D. Defective iron absorption in the gastrointestinal tract
Answer: B
PATHOPHYSIOLOGY FINAL
COMPREHENSIVE EXAM QUESTIONS
AND ANSWERS
1. A patient presents with massive proteinuria, hypoalbuminemia, and generalized edema.
Which of the following is the most likely underlying pathophysiological mechanism?
A. Inflammatory damage to the basement membrane causing hematuria
B. Immune complex deposition leading to a decrease in GFR
C. Obstruction of the renal tubules by cast proteins
D. Increased glomerular permeability to plasma proteins due to podocyte injury
Answer: D
Conceptual Explanation: Nephrotic syndrome is characterized by massive proteinuria
due to increased glomerular permeability, often resulting from podocyte injury or
effacement, which allows proteins to leak into the filtrate.
2. In Myasthenia Gravis, the progressive muscle weakness is primarily caused by which
mechanism?
A. Demyelination of the peripheral motor nerves
,B. Reduced synthesis of dopamine in the substantia nigra
C. Autoantibody-mediated destruction of acetylcholine receptors at the neuromuscular
junction
D. Hyper-excitability of the motor cortex neurons
Answer: C
Conceptual Explanation: Myasthenia Gravis is an autoimmune disorder where antibodies
attack or block acetylcholine receptors at the neuromuscular junction, impairing signal
transmission to muscles.
3. Chronic activation of the renin-angiotensin-aldosterone system (RAAS) in heart failure
leads to which of the following deleterious effects?
A. Vasodilation and sodium excretion
B. Improved renal perfusion and decreased cardiac workload
C. Decreased secretion of B-type natriuretic peptide (BNP)
D. Myocardial remodeling and increased ventricular afterload
Answer: D
Conceptual Explanation: While RAAS initially maintains blood pressure, chronic
activation leads to persistent vasoconstriction (increased afterload), fluid retention, and
myocardial fibrosis/remodeling, worsening heart failure.
, 4. Which clinical finding is characteristic of the Syndrome of Inappropriate Antidiuretic
Hormone (SIADH)?
A. Hypernatremia and low urine specific gravity
B. Dehydration and polyuria
C. Hyponatremia and high urine osmolality
D. Increased serum osmolality and hyperkalemia
Answer: C
Conceptual Explanation: SIADH involves excessive ADH release, leading to water
retention, dilutional hyponatremia, and highly concentrated urine despite normal or
increased intravascular volume.
5. What is the primary pathophysiological defect in Sickle Cell Disease?
A. A deficiency in the production of alpha-globin chains
B. A single amino acid substitution in the beta-globin chain causing hemoglobin
polymerization
C. The absence of glucose-6-phosphate dehydrogenase
D. Defective iron absorption in the gastrointestinal tract
Answer: B
