NURS 611 Exam 5: Advanced Pathophysiology Comprehensive Guide
2026 |Maryville
1. Which of the following describes the primary mechanism of insulin resistance
in Type 2 Diabetes Mellitus?
A. Post-receptor signaling defects involving IRS-1 phosphorylation
B. Complete destruction of pancreatic beta cells by T-cells
C. Absolute deficiency of glucagon-like peptide-1 (GLP-1)
D. Increased sensitivity of GLUT-4 transporters in skeletal muscle
Answer: A
Rationale: Insulin resistance in Type 2 DM is often characterized by impaired intracellular
signaling, specifically abnormalities in the phosphorylation of insulin receptor substrate
(IRS-1), which prevents GLUT-4 translocation.
2. A patient presents with high serum osmolarity, extreme dehydration, and
blood glucose of 850 mg/dL, but no ketones in the urine. What is the most likely
diagnosis?
A. Hyperosmolar Hyperglycemic State (HHS)
B. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
C. Diabetic Ketoacidosis (DKA)
D. Central Diabetes Insipidus
Answer: A
Rationale: HHS is characterized by profound hyperglycemia and hyperosmolarity without
significant ketosis, as there is usually enough insulin to prevent lipolysis but not enough to
control glucose.
,3. In Graves’ disease, the pathophysiology involves which of the following?
A. Production of thyroid-stimulating immunoglobulins (TSI) that mimic TSH
B. Type IV hypersensitivity destroying the follicular cells
C. Secondary hyperthyroidism due to a pituitary adenoma
D. Iodine deficiency leading to excessive TSH production
Answer: A
Rationale: Graves’ disease is a Type II hypersensitivity where autoantibodies (TSI) bind to
and stimulate the TSH receptor, leading to excessive thyroid hormone production.
4. Which electrolyte abnormality is most characteristic of Syndrome of
Inappropriate Antidiuretic Hormone (SIADH)?
A. Hypernatremia
B. Dilutional Hyponatremia
C. Hypokalemia
D. Hypercalcemia
Answer: B
Rationale: SIADH involves excessive ADH, leading to water retention and expansion of
extracellular fluid volume, which results in dilutional hyponatremia.
5. Which clinical finding is most specific to Cushing Disease (Pituitary-
dependent)?
A. Elevated ACTH and elevated Cortisol
B. Low ACTH and elevated Cortisol
C. Hypoglycemia and Hypotension
D. Elevated ACTH and low Cortisol
Answer: A
Rationale: Cushing Disease refers specifically to a pituitary tumor secreting excess ACTH,
which then stimulates the adrenal glands to produce excess cortisol. Cushing Syndrome
(adrenal) would show low ACTH.
, 6. Primary Adrenal Insufficiency (Addison’s Disease) is characterized by the loss
of which hormones?
A. Cortisol only
B. Epinephrine and Norepinephrine
C. Cortisol, Aldosterone, and Androgens
D. Anti-diuretic hormone and Oxytocin
Answer: C
Rationale: Addison’s disease involves the destruction of the adrenal cortex, leading to a
deficiency in all cortical hormones: mineralocorticoids, glucocorticoids, and sex steroids.
7. A patient with a pheochromocytoma will likely exhibit which symptoms due
to excessive catecholamine secretion?
A. Bradycardia and lethargy
B. Episodic hypertension, diaphoresis, and tachycardia
C. Hypotension and weight gain
D. Hypoglycemia and abdominal striae
Answer: B
Rationale: Pheochromocytomas are tumors of the adrenal medulla that secrete
norepinephrine and epinephrine, causing sympathetic nervous system overactivity.
8. What is the primary pathophysiology of Hashimoto Thyroiditis?
A. Autoimmune destruction of the thyroid gland by lymphocytes
B. Excessive iodine intake
C. A benign tumor producing excess T4
D. Pituitary failure to produce TSH
Answer: A
Rationale: Hashimoto’s is an autoimmune disorder where T-cell mediated immunity and
autoantibodies (anti-TPO) destroy thyroid follicular cells, causing hypothyroidism.
2026 |Maryville
1. Which of the following describes the primary mechanism of insulin resistance
in Type 2 Diabetes Mellitus?
A. Post-receptor signaling defects involving IRS-1 phosphorylation
B. Complete destruction of pancreatic beta cells by T-cells
C. Absolute deficiency of glucagon-like peptide-1 (GLP-1)
D. Increased sensitivity of GLUT-4 transporters in skeletal muscle
Answer: A
Rationale: Insulin resistance in Type 2 DM is often characterized by impaired intracellular
signaling, specifically abnormalities in the phosphorylation of insulin receptor substrate
(IRS-1), which prevents GLUT-4 translocation.
2. A patient presents with high serum osmolarity, extreme dehydration, and
blood glucose of 850 mg/dL, but no ketones in the urine. What is the most likely
diagnosis?
A. Hyperosmolar Hyperglycemic State (HHS)
B. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
C. Diabetic Ketoacidosis (DKA)
D. Central Diabetes Insipidus
Answer: A
Rationale: HHS is characterized by profound hyperglycemia and hyperosmolarity without
significant ketosis, as there is usually enough insulin to prevent lipolysis but not enough to
control glucose.
,3. In Graves’ disease, the pathophysiology involves which of the following?
A. Production of thyroid-stimulating immunoglobulins (TSI) that mimic TSH
B. Type IV hypersensitivity destroying the follicular cells
C. Secondary hyperthyroidism due to a pituitary adenoma
D. Iodine deficiency leading to excessive TSH production
Answer: A
Rationale: Graves’ disease is a Type II hypersensitivity where autoantibodies (TSI) bind to
and stimulate the TSH receptor, leading to excessive thyroid hormone production.
4. Which electrolyte abnormality is most characteristic of Syndrome of
Inappropriate Antidiuretic Hormone (SIADH)?
A. Hypernatremia
B. Dilutional Hyponatremia
C. Hypokalemia
D. Hypercalcemia
Answer: B
Rationale: SIADH involves excessive ADH, leading to water retention and expansion of
extracellular fluid volume, which results in dilutional hyponatremia.
5. Which clinical finding is most specific to Cushing Disease (Pituitary-
dependent)?
A. Elevated ACTH and elevated Cortisol
B. Low ACTH and elevated Cortisol
C. Hypoglycemia and Hypotension
D. Elevated ACTH and low Cortisol
Answer: A
Rationale: Cushing Disease refers specifically to a pituitary tumor secreting excess ACTH,
which then stimulates the adrenal glands to produce excess cortisol. Cushing Syndrome
(adrenal) would show low ACTH.
, 6. Primary Adrenal Insufficiency (Addison’s Disease) is characterized by the loss
of which hormones?
A. Cortisol only
B. Epinephrine and Norepinephrine
C. Cortisol, Aldosterone, and Androgens
D. Anti-diuretic hormone and Oxytocin
Answer: C
Rationale: Addison’s disease involves the destruction of the adrenal cortex, leading to a
deficiency in all cortical hormones: mineralocorticoids, glucocorticoids, and sex steroids.
7. A patient with a pheochromocytoma will likely exhibit which symptoms due
to excessive catecholamine secretion?
A. Bradycardia and lethargy
B. Episodic hypertension, diaphoresis, and tachycardia
C. Hypotension and weight gain
D. Hypoglycemia and abdominal striae
Answer: B
Rationale: Pheochromocytomas are tumors of the adrenal medulla that secrete
norepinephrine and epinephrine, causing sympathetic nervous system overactivity.
8. What is the primary pathophysiology of Hashimoto Thyroiditis?
A. Autoimmune destruction of the thyroid gland by lymphocytes
B. Excessive iodine intake
C. A benign tumor producing excess T4
D. Pituitary failure to produce TSH
Answer: A
Rationale: Hashimoto’s is an autoimmune disorder where T-cell mediated immunity and
autoantibodies (anti-TPO) destroy thyroid follicular cells, causing hypothyroidism.
