NURS 611 Exam 3 V2 | NURS 611
Advanced Pathophysiology | Maryville
University of St. Louis | 2026 Q&A with
Rationale (Maryville NURS611 Exam 3
2026)
1. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH).
Which laboratory result is most consistent with this diagnosis?
A. Serum sodium 120 mEq/L
B. Serum osmolality 310 mOsm/kg
C. Uine specific gravity 1.002
D. Serum sodium 150 mEq/L
Correct Answer: A
Rationale: SIADH involves excessive ADH secretion which causes the kidneys to retain
water. This results in dilutional hyponatremia and a low serum sodium level. The excess
water volume suppresses the renin-angiotensin-aldosterone system, further contributing
to sodium loss in the urine.
2. Which mechanism describes the primary pathophysiology of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
,C. Excessive glucagon production from alpha cells
D. Decreased glucose uptake by the liver
Correct Answer: B
Rationale: Type 1 Diabetes is characterized by a T-cell mediated autoimmune attack on
the insulin-producing beta cells. This leads to an absolute insulin deficiency over time.
Patients with this condition require exogenous insulin to prevent ketoacidosis and
maintain glucose homeostasis.
3. A patient with Chronic Kidney Disease (CKD) presents with a hemoglobin of 8.2 g/dL. What
is the underlying cause of this anemia?
A. Inadequate production of erythropoietin
B. Vitamin B12 deficiency due to dietary restrictions
C. Chronic blood loss during hemodialysis
D. Iron malabsorption in the small intestine
Correct Answer: A
Rationale: The kidneys are responsible for producing erythropoietin in response to
cellular hypoxia. In CKD, the peritubular fibroblasts are damaged and cannot produce
sufficient amounts of this hormone. This lack of stimulation leads to decreased red blood
cell production in the bone marrow.
, 4. What is the most common cause of hyperthyroidism, characterized by goiter and
exophthalmos?
A. Hashimoto thyroiditis
B. Graves disease
C. Toxic multinodular goiter
D. Pituitary adenoma
Correct Answer: B
Rationale: Graves disease is an autoimmune disorder where thyroid-stimulating
immunoglobulins (TSI) bind to TSH receptors. This causes the thyroid to overproduce
thyroid hormones T3 and T4. The unique clinical features include diffuse thyroid
enlargement and infiltrative ophthalmopathy.
5. A 45-year-old female presents with central obesity, a ‘buffalo hump,’ and purple striae.
Which diagnostic finding is most likely?
A. Elevated serum cortisol levels
B. High serum ACTH and low cortisol
C. Normal serum cortisol with high potassium
D. Low serum ACTH and high cortisol
Correct Answer: A
Advanced Pathophysiology | Maryville
University of St. Louis | 2026 Q&A with
Rationale (Maryville NURS611 Exam 3
2026)
1. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH).
Which laboratory result is most consistent with this diagnosis?
A. Serum sodium 120 mEq/L
B. Serum osmolality 310 mOsm/kg
C. Uine specific gravity 1.002
D. Serum sodium 150 mEq/L
Correct Answer: A
Rationale: SIADH involves excessive ADH secretion which causes the kidneys to retain
water. This results in dilutional hyponatremia and a low serum sodium level. The excess
water volume suppresses the renin-angiotensin-aldosterone system, further contributing
to sodium loss in the urine.
2. Which mechanism describes the primary pathophysiology of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
,C. Excessive glucagon production from alpha cells
D. Decreased glucose uptake by the liver
Correct Answer: B
Rationale: Type 1 Diabetes is characterized by a T-cell mediated autoimmune attack on
the insulin-producing beta cells. This leads to an absolute insulin deficiency over time.
Patients with this condition require exogenous insulin to prevent ketoacidosis and
maintain glucose homeostasis.
3. A patient with Chronic Kidney Disease (CKD) presents with a hemoglobin of 8.2 g/dL. What
is the underlying cause of this anemia?
A. Inadequate production of erythropoietin
B. Vitamin B12 deficiency due to dietary restrictions
C. Chronic blood loss during hemodialysis
D. Iron malabsorption in the small intestine
Correct Answer: A
Rationale: The kidneys are responsible for producing erythropoietin in response to
cellular hypoxia. In CKD, the peritubular fibroblasts are damaged and cannot produce
sufficient amounts of this hormone. This lack of stimulation leads to decreased red blood
cell production in the bone marrow.
, 4. What is the most common cause of hyperthyroidism, characterized by goiter and
exophthalmos?
A. Hashimoto thyroiditis
B. Graves disease
C. Toxic multinodular goiter
D. Pituitary adenoma
Correct Answer: B
Rationale: Graves disease is an autoimmune disorder where thyroid-stimulating
immunoglobulins (TSI) bind to TSH receptors. This causes the thyroid to overproduce
thyroid hormones T3 and T4. The unique clinical features include diffuse thyroid
enlargement and infiltrative ophthalmopathy.
5. A 45-year-old female presents with central obesity, a ‘buffalo hump,’ and purple striae.
Which diagnostic finding is most likely?
A. Elevated serum cortisol levels
B. High serum ACTH and low cortisol
C. Normal serum cortisol with high potassium
D. Low serum ACTH and high cortisol
Correct Answer: A
