NURS 611 Advanced Pathophysiology Midterm Exam 2 2026
|Maryville
1. Which physiological mechanism best describes the development of Syndrome
of Inappropriate Antidiuretic Hormone (SIADH)?
A. Excessive water excretion due to ADH deficiency
B. Increased renal collecting duct permeability to water regardless of serum osmolality
C. Decreased production of aldosterone from the adrenal cortex
D. Resistance of the nephron to the action of arginine vasopressin
Answer: B
Rationale: SIADH is characterized by the excessive release of ADH, leading to increased
water reabsorption in the collecting ducts, which results in dilutional hyponatremia and
concentrated urine.
2. In Diabetes Insipidus (DI), the primary clinical manifestation of polyuria is a
result of:
A. Osmotic diuresis from hyperglycemia
B. Excessive intake of fluids due to hypothalamic thirst center dysfunction
C. Inability of the kidneys to concentrate urine due to lack of ADH effect
D. Loss of sodium in the proximal convoluted tubule
Answer: C
Rationale: Diabetes Insipidus involves either a lack of ADH (central) or a lack of response
to ADH (nephrogenic), preventing the kidneys from reabsorbing water and leading to large
volumes of dilute urine.
,3. A patient with Cushing Syndrome is found to have an ACTH-secreting pituitary
adenoma. This specific condition is known as:
A. Addison Disease
B. Cushing Disease
C. Conn Syndrome
D. Pheochromocytoma
Answer: B
Rationale: Cushing Disease specifically refers to hypercortisolism caused by an ACTH-
secreting pituitary tumor, whereas Cushing Syndrome is the broad term for any cause of
excess cortisol.
4. What is the primary pathophysiology behind Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Overproduction of glucagon by alpha cells
C. Autoimmune destruction of pancreatic beta cells
D. Decreased glucose uptake by the GLUT4 transporters
Answer: C
Rationale: Type 1 Diabetes is an autoimmune condition where T-cell mediated destruction
of beta cells in the Islets of Langerhans leads to an absolute insulin deficiency.
5. Which laboratory finding is most consistent with a diagnosis of Primary
Hyperparathyroidism?
A. Hypocalcemia and Hyperphosphatemia
B. Hypercalcemia and Hypermagnesemia
C. Hypercalcemia and Hypophosphatemia
D. Hypocalcemia and Hypophosphatemia
Answer: C
, Rationale: Excess PTH increases bone resorption and renal calcium reabsorption while
increasing renal phosphate excretion, leading to high serum calcium and low serum
phosphate.
6. In the compensatory stage of Heart Failure, the activation of the Renin-
Angiotensin-Aldosterone System (RAAS) initially results in:
A. Vasodilation and sodium excretion
B. Increased preload and increased afterload
C. Decreased cardiac workload
D. Suppression of the sympathetic nervous system
Answer: B
Rationale: RAAS activation causes vasoconstriction (increasing afterload) and
sodium/water retention (increasing preload) to maintain blood pressure, though this
eventually worsens heart failure.
7. Which type of anemia is characterized by the presence of macrocytic-
normochromic erythrocytes?
A. Iron Deficiency Anemia
B. Sideroblastic Anemia
C. Pernicious Anemia
D. Thalassemia
Answer: C
Rationale: Pernicious anemia, caused by Vitamin B12 deficiency, results in macrocytic
(large) cells due to impaired DNA synthesis during erythropoiesis.
|Maryville
1. Which physiological mechanism best describes the development of Syndrome
of Inappropriate Antidiuretic Hormone (SIADH)?
A. Excessive water excretion due to ADH deficiency
B. Increased renal collecting duct permeability to water regardless of serum osmolality
C. Decreased production of aldosterone from the adrenal cortex
D. Resistance of the nephron to the action of arginine vasopressin
Answer: B
Rationale: SIADH is characterized by the excessive release of ADH, leading to increased
water reabsorption in the collecting ducts, which results in dilutional hyponatremia and
concentrated urine.
2. In Diabetes Insipidus (DI), the primary clinical manifestation of polyuria is a
result of:
A. Osmotic diuresis from hyperglycemia
B. Excessive intake of fluids due to hypothalamic thirst center dysfunction
C. Inability of the kidneys to concentrate urine due to lack of ADH effect
D. Loss of sodium in the proximal convoluted tubule
Answer: C
Rationale: Diabetes Insipidus involves either a lack of ADH (central) or a lack of response
to ADH (nephrogenic), preventing the kidneys from reabsorbing water and leading to large
volumes of dilute urine.
,3. A patient with Cushing Syndrome is found to have an ACTH-secreting pituitary
adenoma. This specific condition is known as:
A. Addison Disease
B. Cushing Disease
C. Conn Syndrome
D. Pheochromocytoma
Answer: B
Rationale: Cushing Disease specifically refers to hypercortisolism caused by an ACTH-
secreting pituitary tumor, whereas Cushing Syndrome is the broad term for any cause of
excess cortisol.
4. What is the primary pathophysiology behind Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Overproduction of glucagon by alpha cells
C. Autoimmune destruction of pancreatic beta cells
D. Decreased glucose uptake by the GLUT4 transporters
Answer: C
Rationale: Type 1 Diabetes is an autoimmune condition where T-cell mediated destruction
of beta cells in the Islets of Langerhans leads to an absolute insulin deficiency.
5. Which laboratory finding is most consistent with a diagnosis of Primary
Hyperparathyroidism?
A. Hypocalcemia and Hyperphosphatemia
B. Hypercalcemia and Hypermagnesemia
C. Hypercalcemia and Hypophosphatemia
D. Hypocalcemia and Hypophosphatemia
Answer: C
, Rationale: Excess PTH increases bone resorption and renal calcium reabsorption while
increasing renal phosphate excretion, leading to high serum calcium and low serum
phosphate.
6. In the compensatory stage of Heart Failure, the activation of the Renin-
Angiotensin-Aldosterone System (RAAS) initially results in:
A. Vasodilation and sodium excretion
B. Increased preload and increased afterload
C. Decreased cardiac workload
D. Suppression of the sympathetic nervous system
Answer: B
Rationale: RAAS activation causes vasoconstriction (increasing afterload) and
sodium/water retention (increasing preload) to maintain blood pressure, though this
eventually worsens heart failure.
7. Which type of anemia is characterized by the presence of macrocytic-
normochromic erythrocytes?
A. Iron Deficiency Anemia
B. Sideroblastic Anemia
C. Pernicious Anemia
D. Thalassemia
Answer: C
Rationale: Pernicious anemia, caused by Vitamin B12 deficiency, results in macrocytic
(large) cells due to impaired DNA synthesis during erythropoiesis.
