NUR 631/NUR631 Exam 4 V2 | Advanced
Physiology and Pathophysiology Q&A with
Rationale | Grand Canyon University
1. Which of the following describes the pathophysiology of Syndrome of Inappropriate
Antidiuretic Hormone (SIADH)?
A. Deficiency of ADH leading to polyuria and severe dehydration.
B. Excessive secretion of ADH leading to water retention and dilutional hyponatremia.
C. Resistance to ADH at the level of the renal tubules.
D. Increased serum osmolality causing excessive thirst and high urine output.
Correct Answer: B
Expert Explanation: SIADH involves the high levels of ADH without physiological stimuli
for its release. This causes the kidneys to reabsorb water excessively, which expands
extracellular fluid volume. The resulting dilutional hyponatremia is a hallmark sign that
clinicians must monitor closely to prevent neurological complications.
2. A patient with Graves’ disease is likely to exhibit which of the following clinical
manifestations?
A. Weight gain, bradycardia, and cold intolerance.
B. Periorbital edema and slowed deep tendon reflexes.
C. Hypotension, dry skin, and constipation.
,D. Exophthalmos, tachycardia, and heat intolerance.
Correct Answer: D
Expert Explanation: Graves’ disease is an autoimmune disorder where antibodies
stimulate the TSH receptor, leading to hyperthyroidism. The hypermetabolic state results
in symptoms like tachycardia and heat intolerance. Exophthalmos is a specific clinical sign
caused by orbital fat accumulation and inflammation unique to this condition.
3. What is the primary difference between Cushing Syndrome and Cushing Disease?
A. Syndrome refers specifically to a pituitary tumor, while disease refers to adrenal tumors.
B. Syndrome is caused by low cortisol, whereas disease is caused by high cortisol.
C. Disease refers specifically to a pituitary adenoma secreting ACTH, while syndrome is the
clinical condition of excess cortisol.
D. There is no difference; the terms are used interchangeably in all clinical settings.
Correct Answer: C
Expert Explanation: Cushing syndrome is the broad clinical manifestation of
hypercortisolism regardless of the cause. Cushing disease is a specific subtype caused by
excessive ACTH secretion from a pituitary adenoma. Distinguishing between the two is
essential for determining whether the treatment should target the pituitary gland or the
adrenal glands.
4. In Type 1 Diabetes Mellitus, the destruction of which cells leads to insulin deficiency?
A. Beta cells of the pancreas.
, B. Delta cells of the pancreas.
C. Alpha cells of the pancreas.
D. Kupffer cells of the liver.
Correct Answer: A
Expert Explanation: Type 1 Diabetes is an autoimmune condition where T-cells attack and
destroy the insulin-producing beta cells in the Islets of Langerhans. This leads to an
absolute deficiency of insulin, requiring exogenous insulin for survival. Alpha cells, in
contrast, produce glucagon and are usually spared in this specific autoimmune process.
5. What is the hallmark physiological finding in Nephrotic Syndrome?
A. Hematuria and hypertension.
B. Increased glomerular filtration rate (GFR).
C. Proteinuria exceeding 3.5 grams per day.
D. Decreased serum cholesterol and triglycerides.
Correct Answer: C
Expert Explanation: Nephrotic syndrome is characterized by massive proteinuria due to
increased glomerular permeability. This loss of protein leads to hypoalbuminemia and
subsequent generalized edema. The liver also increases lipid synthesis to compensate for
lost albumin, resulting in hyperlipidemia.
Physiology and Pathophysiology Q&A with
Rationale | Grand Canyon University
1. Which of the following describes the pathophysiology of Syndrome of Inappropriate
Antidiuretic Hormone (SIADH)?
A. Deficiency of ADH leading to polyuria and severe dehydration.
B. Excessive secretion of ADH leading to water retention and dilutional hyponatremia.
C. Resistance to ADH at the level of the renal tubules.
D. Increased serum osmolality causing excessive thirst and high urine output.
Correct Answer: B
Expert Explanation: SIADH involves the high levels of ADH without physiological stimuli
for its release. This causes the kidneys to reabsorb water excessively, which expands
extracellular fluid volume. The resulting dilutional hyponatremia is a hallmark sign that
clinicians must monitor closely to prevent neurological complications.
2. A patient with Graves’ disease is likely to exhibit which of the following clinical
manifestations?
A. Weight gain, bradycardia, and cold intolerance.
B. Periorbital edema and slowed deep tendon reflexes.
C. Hypotension, dry skin, and constipation.
,D. Exophthalmos, tachycardia, and heat intolerance.
Correct Answer: D
Expert Explanation: Graves’ disease is an autoimmune disorder where antibodies
stimulate the TSH receptor, leading to hyperthyroidism. The hypermetabolic state results
in symptoms like tachycardia and heat intolerance. Exophthalmos is a specific clinical sign
caused by orbital fat accumulation and inflammation unique to this condition.
3. What is the primary difference between Cushing Syndrome and Cushing Disease?
A. Syndrome refers specifically to a pituitary tumor, while disease refers to adrenal tumors.
B. Syndrome is caused by low cortisol, whereas disease is caused by high cortisol.
C. Disease refers specifically to a pituitary adenoma secreting ACTH, while syndrome is the
clinical condition of excess cortisol.
D. There is no difference; the terms are used interchangeably in all clinical settings.
Correct Answer: C
Expert Explanation: Cushing syndrome is the broad clinical manifestation of
hypercortisolism regardless of the cause. Cushing disease is a specific subtype caused by
excessive ACTH secretion from a pituitary adenoma. Distinguishing between the two is
essential for determining whether the treatment should target the pituitary gland or the
adrenal glands.
4. In Type 1 Diabetes Mellitus, the destruction of which cells leads to insulin deficiency?
A. Beta cells of the pancreas.
, B. Delta cells of the pancreas.
C. Alpha cells of the pancreas.
D. Kupffer cells of the liver.
Correct Answer: A
Expert Explanation: Type 1 Diabetes is an autoimmune condition where T-cells attack and
destroy the insulin-producing beta cells in the Islets of Langerhans. This leads to an
absolute deficiency of insulin, requiring exogenous insulin for survival. Alpha cells, in
contrast, produce glucagon and are usually spared in this specific autoimmune process.
5. What is the hallmark physiological finding in Nephrotic Syndrome?
A. Hematuria and hypertension.
B. Increased glomerular filtration rate (GFR).
C. Proteinuria exceeding 3.5 grams per day.
D. Decreased serum cholesterol and triglycerides.
Correct Answer: C
Expert Explanation: Nephrotic syndrome is characterized by massive proteinuria due to
increased glomerular permeability. This loss of protein leads to hypoalbuminemia and
subsequent generalized edema. The liver also increases lipid synthesis to compensate for
lost albumin, resulting in hyperlipidemia.
