NU606 | NU606 Advanced Pathophysiology Exam 4
Version 3 | Questions with Correct Answers and
Expert Explanation for Each Question | Regis
1. A patient presents with a serum sodium of 120 mEq/L and a high urine specific
gravity. Which condition is most likely causing these findings?
A. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
B. Diabetes Insipidus
C. Hypoparathyroidism
D. Cushing’s Syndrome
Correct Answer: A
Expert Explanation: SIADH involves the excessive release of antidiuretic hormone,
leading to water retention and dilutional hyponatremia. The concentrated urine
reflects the body’s inability to excrete water despite low serum osmolality. This
clinical picture is the opposite of Diabetes Insipidus, where water is lost in large
volumes.
2. What is the primary pathophysiology behind Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Excessive glucagon secretion from alpha cells
C. Increased hepatic glucose production
,D. Autoimmune destruction of pancreatic beta cells
Correct Answer: D
Expert Explanation: Type 1 Diabetes is characterized by an absolute insulin
deficiency due to the immune-mediated destruction of beta cells. This process is
typically triggered by environmental factors in genetically susceptible individuals.
Without insulin, glucose cannot enter cells, leading to hyperglycemia and
ketoacidosis.
3. Which of the following physical findings is a classic sign of Graves’ disease?
A. Myxedema coma
B. Exophthalmos
C. Moon face
D. Buffalo hump
Correct Answer: B
Expert Explanation: Graves’ disease is an autoimmune condition resulting in
hyperthyroidism, often accompanied by ophthalmopathy. Exophthalmos occurs due
to inflammation and accumulation of connective tissue behind the eyes. It is
specifically associated with the thyroid-stimulating immunoglobulins found in
Graves’ disease patients.
,4. A patient exhibits truncal obesity, thin skin, and ‘purple striae.’ What is the most
likely diagnosis?
A. Addison’s Disease
B. Cushing’s Syndrome
C. Hashimoto’s Thyroiditis
D. Pheochromocytoma
Correct Answer: B
Expert Explanation: Cushing’s syndrome results from chronic exposure to
excessive levels of cortisol. The metabolic effects include fat redistribution to the
trunk and face, as well as protein wasting leading to thin skin and striae. This
condition can be caused by an adrenal tumor, a pituitary tumor, or exogenous
steroid use.
5. Which electrolyte imbalance is most commonly associated with Primary
Hyperparathyroidism?
A. Hypocalcemia
B. Hyperkalemia
C. Hyponatremia
D. Hypercalcemia
, Correct Answer: D
Expert Explanation: Hyperparathyroidism leads to increased secretion of
parathyroid hormone, which stimulates calcium release from bones. It also
increases calcium reabsorption in the kidneys and absorption in the intestines.
Consequently, patients present with elevated serum calcium levels and potentially
low phosphate levels.
6. What is the hallmark clinical manifestation of Diabetes Insipidus?
A. Severe hypertension
B. Polyuria and polydipsia
C. Weight gain and edema
D. Hypoglycemia
Correct Answer: B
Expert Explanation: Diabetes Insipidus is caused by a deficiency of ADH or a
decreased renal response to it. This leads to the inability of the kidneys to
concentrate urine, resulting in large volumes of dilute urine (polyuria). To
compensate for the fluid loss, patients experience intense thirst (polydipsia).
7. Which condition is characterized by an inadequate secretion of cortisol and
aldosterone?
A. Cushing’s Disease
Version 3 | Questions with Correct Answers and
Expert Explanation for Each Question | Regis
1. A patient presents with a serum sodium of 120 mEq/L and a high urine specific
gravity. Which condition is most likely causing these findings?
A. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
B. Diabetes Insipidus
C. Hypoparathyroidism
D. Cushing’s Syndrome
Correct Answer: A
Expert Explanation: SIADH involves the excessive release of antidiuretic hormone,
leading to water retention and dilutional hyponatremia. The concentrated urine
reflects the body’s inability to excrete water despite low serum osmolality. This
clinical picture is the opposite of Diabetes Insipidus, where water is lost in large
volumes.
2. What is the primary pathophysiology behind Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Excessive glucagon secretion from alpha cells
C. Increased hepatic glucose production
,D. Autoimmune destruction of pancreatic beta cells
Correct Answer: D
Expert Explanation: Type 1 Diabetes is characterized by an absolute insulin
deficiency due to the immune-mediated destruction of beta cells. This process is
typically triggered by environmental factors in genetically susceptible individuals.
Without insulin, glucose cannot enter cells, leading to hyperglycemia and
ketoacidosis.
3. Which of the following physical findings is a classic sign of Graves’ disease?
A. Myxedema coma
B. Exophthalmos
C. Moon face
D. Buffalo hump
Correct Answer: B
Expert Explanation: Graves’ disease is an autoimmune condition resulting in
hyperthyroidism, often accompanied by ophthalmopathy. Exophthalmos occurs due
to inflammation and accumulation of connective tissue behind the eyes. It is
specifically associated with the thyroid-stimulating immunoglobulins found in
Graves’ disease patients.
,4. A patient exhibits truncal obesity, thin skin, and ‘purple striae.’ What is the most
likely diagnosis?
A. Addison’s Disease
B. Cushing’s Syndrome
C. Hashimoto’s Thyroiditis
D. Pheochromocytoma
Correct Answer: B
Expert Explanation: Cushing’s syndrome results from chronic exposure to
excessive levels of cortisol. The metabolic effects include fat redistribution to the
trunk and face, as well as protein wasting leading to thin skin and striae. This
condition can be caused by an adrenal tumor, a pituitary tumor, or exogenous
steroid use.
5. Which electrolyte imbalance is most commonly associated with Primary
Hyperparathyroidism?
A. Hypocalcemia
B. Hyperkalemia
C. Hyponatremia
D. Hypercalcemia
, Correct Answer: D
Expert Explanation: Hyperparathyroidism leads to increased secretion of
parathyroid hormone, which stimulates calcium release from bones. It also
increases calcium reabsorption in the kidneys and absorption in the intestines.
Consequently, patients present with elevated serum calcium levels and potentially
low phosphate levels.
6. What is the hallmark clinical manifestation of Diabetes Insipidus?
A. Severe hypertension
B. Polyuria and polydipsia
C. Weight gain and edema
D. Hypoglycemia
Correct Answer: B
Expert Explanation: Diabetes Insipidus is caused by a deficiency of ADH or a
decreased renal response to it. This leads to the inability of the kidneys to
concentrate urine, resulting in large volumes of dilute urine (polyuria). To
compensate for the fluid loss, patients experience intense thirst (polydipsia).
7. Which condition is characterized by an inadequate secretion of cortisol and
aldosterone?
A. Cushing’s Disease
