NSG530 / NSG 530 EXAM 3: ADVANCED
PATHOPHYSIOLOGY QUESTIONS AND
VERIFIED ANSWERS | 100% CORRECT |
GRADE A+ - WILKES
1. Which mechanism primarily accounts for the decrease in Glomerular Filtration Rate (GFR)
in patients with Acute Tubular Necrosis (ATN)?
A. Decreased hydrostatic pressure in the Bowman’s capsule
B. Afferent arteriolar vasodilation
C. Increased oncotic pressure in the glomerular capillaries
D. Obstruction of tubules by sloughed necrotic cells and debris
Answer: D
Conceptual Explanation: In ATN, necrotic tubular epithelial cells slough off and obstruct
the lumen, increasing intraluminal pressure and opposing filtration, which leads to a
decreased GFR.
2. In the pathogenesis of Graves’ disease, what is the role of Thyroid-Stimulating
Immunoglobulins (TSI)?
A. They act as antagonists to the TSH receptor, causing hypothyroidism
,B. They stimulate the TSH receptors on the thyroid gland, bypassing the normal feedback
loop
C. They destroy the thyroid follicular cells through cell-mediated immunity
D. They inhibit the conversion of T4 to T3 in peripheral tissues
Answer: B
Conceptual Explanation: Graves’ disease is a type II hypersensitivity reaction where TSI
(autoantibodies) bind to and activate TSH receptors, causing autonomous overproduction
of thyroid hormones.
3. A patient with Chronic Kidney Disease (CKD) develops secondary hyperparathyroidism.
What is the initiating factor for this condition?
A. Excessive production of Vitamin D by the kidneys
B. Direct stimulation of the parathyroid gland by high urea levels
C. Hypocalcemia resulting from decreased phosphate excretion and low calcitriol
D. Primary adenoma of the parathyroid gland
Answer: C
Conceptual Explanation: CKD leads to phosphate retention and failure of the kidneys to
activate Vitamin D (calcitriol). Low calcitriol and high phosphate lead to hypocalcemia,
which stimulates the parathyroid glands to secrete PTH.
, 4. Which pathological feature distinguishes Crohn’s disease from Ulcerative Colitis?
A. Involvement of the mucosal layer only
B. Continuous lesions starting from the rectum
C. Presence of bloody diarrhea in nearly all cases
D. Transmural inflammation and skip lesions
Answer: D
Conceptual Explanation: Crohn’s disease is characterized by transmural inflammation
(affecting all layers of the bowel wall) and ‘skip lesions’ (discontinuous areas of
inflammation), unlike Ulcerative Colitis which is continuous and superficial.
5. What is the primary pathophysiology behind the development of ascites in a patient with
liver cirrhosis?
A. Increased plasma oncotic pressure
B. Increased systemic vascular resistance
C. Portal hypertension and decreased synthesis of albumin
D. Decreased activity of the renin-angiotensin-aldosterone system
Answer: C
Conceptual Explanation: Cirrhosis causes portal hypertension (increasing capillary
hydrostatic pressure) and hypoalbuminemia (decreasing capillary oncotic pressure), both
of which drive fluid into the peritoneal cavity.
PATHOPHYSIOLOGY QUESTIONS AND
VERIFIED ANSWERS | 100% CORRECT |
GRADE A+ - WILKES
1. Which mechanism primarily accounts for the decrease in Glomerular Filtration Rate (GFR)
in patients with Acute Tubular Necrosis (ATN)?
A. Decreased hydrostatic pressure in the Bowman’s capsule
B. Afferent arteriolar vasodilation
C. Increased oncotic pressure in the glomerular capillaries
D. Obstruction of tubules by sloughed necrotic cells and debris
Answer: D
Conceptual Explanation: In ATN, necrotic tubular epithelial cells slough off and obstruct
the lumen, increasing intraluminal pressure and opposing filtration, which leads to a
decreased GFR.
2. In the pathogenesis of Graves’ disease, what is the role of Thyroid-Stimulating
Immunoglobulins (TSI)?
A. They act as antagonists to the TSH receptor, causing hypothyroidism
,B. They stimulate the TSH receptors on the thyroid gland, bypassing the normal feedback
loop
C. They destroy the thyroid follicular cells through cell-mediated immunity
D. They inhibit the conversion of T4 to T3 in peripheral tissues
Answer: B
Conceptual Explanation: Graves’ disease is a type II hypersensitivity reaction where TSI
(autoantibodies) bind to and activate TSH receptors, causing autonomous overproduction
of thyroid hormones.
3. A patient with Chronic Kidney Disease (CKD) develops secondary hyperparathyroidism.
What is the initiating factor for this condition?
A. Excessive production of Vitamin D by the kidneys
B. Direct stimulation of the parathyroid gland by high urea levels
C. Hypocalcemia resulting from decreased phosphate excretion and low calcitriol
D. Primary adenoma of the parathyroid gland
Answer: C
Conceptual Explanation: CKD leads to phosphate retention and failure of the kidneys to
activate Vitamin D (calcitriol). Low calcitriol and high phosphate lead to hypocalcemia,
which stimulates the parathyroid glands to secrete PTH.
, 4. Which pathological feature distinguishes Crohn’s disease from Ulcerative Colitis?
A. Involvement of the mucosal layer only
B. Continuous lesions starting from the rectum
C. Presence of bloody diarrhea in nearly all cases
D. Transmural inflammation and skip lesions
Answer: D
Conceptual Explanation: Crohn’s disease is characterized by transmural inflammation
(affecting all layers of the bowel wall) and ‘skip lesions’ (discontinuous areas of
inflammation), unlike Ulcerative Colitis which is continuous and superficial.
5. What is the primary pathophysiology behind the development of ascites in a patient with
liver cirrhosis?
A. Increased plasma oncotic pressure
B. Increased systemic vascular resistance
C. Portal hypertension and decreased synthesis of albumin
D. Decreased activity of the renin-angiotensin-aldosterone system
Answer: C
Conceptual Explanation: Cirrhosis causes portal hypertension (increasing capillary
hydrostatic pressure) and hypoalbuminemia (decreasing capillary oncotic pressure), both
of which drive fluid into the peritoneal cavity.
