NUR 546/NUR546 Exam 4 V2 | Advanced
Pathophysiology Q&A with Rationale |
William Paterson University
1. Which of the following describes the pathophysiology of Type 1 Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells leading to absolute insulin deficiency.
B. Excessive glucagon secretion from the alpha cells in the liver.
C. Peripheral insulin resistance and compensatory hyperinsulinemia.
D. Inhibition of glucose uptake by skeletal muscle due to cortisol excess.
Answer: A
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute lack of insulin due to
the T-cell mediated destruction of pancreatic beta cells. This condition often manifests in
childhood or adolescence but can occur at any age. Without insulin, glucose cannot enter
the cells, leading to hyperglycemia and the breakdown of fats for energy, which can result
in ketoacidosis.
2. A patient presents with a serum sodium level of 120 mEq/L, low serum osmolality, and
high urine osmolality. Which condition is most likely?
A. Diabetes Insipidus (DI)
B. Primary Polydipsia
C. Adrenal Insufficiency
,D. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
Answer: D
Rationale: SIADH involves the excessive release of antidiuretic hormone, which causes the
kidneys to reabsorb too much water. This results in dilutional hyponatremia where the
serum is dilute but the urine is concentrated. Patients with this condition are typically
euvolemic but are at high risk for neurological complications due to brain swelling.
3. Which clinical finding is a hallmark sign of Graves’ Disease?
A. Hypercalcemia and kidney stones
B. Weight gain and bradycardia
C. Cold intolerance and dry skin
D. Exophthalmos (bulging eyes)
Answer: D
Rationale: Graves’ Disease is an autoimmune form of hyperthyroidism caused by thyroid-
stimulating immunoglobulins that bind to TSH receptors. The unique clinical feature of
Graves’ is exophthalmos, which results from inflammation and accumulation of connective
tissue behind the eyes. Other symptoms include tachycardia, heat intolerance, and an
enlarged thyroid gland.
4. In the development of DKA, why does the body produce ketones?
A. The liver processes excess glucose into ketone bodies.
, B. Insulin deficiency leads to the breakdown of fats for energy in the absence of glucose
uptake.
C. Ketones are a byproduct of muscle protein catabolism.
D. Glucagon prevents the kidneys from excreting metabolic waste.
Answer: B
Rationale: In Diabetic Ketoacidosis (DKA), the body lacks sufficient insulin to move
glucose into the cells for fuel. To compensate, the body begins breaking down fatty acids, a
process that produces acidic ketones as a byproduct. This accumulation of ketones leads to
metabolic acidosis, which is a life-threatening emergency often seen in Type 1 diabetics.
5. What is the primary pathophysiology behind Cushing’s Syndrome?
A. Chronic exposure to excess levels of cortisol.
B. Deficiency of adrenocorticotropic hormone (ACTH).
C. Autoimmune destruction of the adrenal cortex.
D. Overproduction of aldosterone by the adrenal glands.
Answer: A
Rationale: Cushing’s Syndrome refers to the clinical manifestations of chronic exposure to
excessive glucocorticoids, primarily cortisol. This can be caused by an adrenal tumor, an
ACTH-secreting pituitary tumor, or long-term exogenous steroid use. Common signs
include central obesity, a ‘buffalo hump,’ and thin, easily bruised skin.
Pathophysiology Q&A with Rationale |
William Paterson University
1. Which of the following describes the pathophysiology of Type 1 Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells leading to absolute insulin deficiency.
B. Excessive glucagon secretion from the alpha cells in the liver.
C. Peripheral insulin resistance and compensatory hyperinsulinemia.
D. Inhibition of glucose uptake by skeletal muscle due to cortisol excess.
Answer: A
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute lack of insulin due to
the T-cell mediated destruction of pancreatic beta cells. This condition often manifests in
childhood or adolescence but can occur at any age. Without insulin, glucose cannot enter
the cells, leading to hyperglycemia and the breakdown of fats for energy, which can result
in ketoacidosis.
2. A patient presents with a serum sodium level of 120 mEq/L, low serum osmolality, and
high urine osmolality. Which condition is most likely?
A. Diabetes Insipidus (DI)
B. Primary Polydipsia
C. Adrenal Insufficiency
,D. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
Answer: D
Rationale: SIADH involves the excessive release of antidiuretic hormone, which causes the
kidneys to reabsorb too much water. This results in dilutional hyponatremia where the
serum is dilute but the urine is concentrated. Patients with this condition are typically
euvolemic but are at high risk for neurological complications due to brain swelling.
3. Which clinical finding is a hallmark sign of Graves’ Disease?
A. Hypercalcemia and kidney stones
B. Weight gain and bradycardia
C. Cold intolerance and dry skin
D. Exophthalmos (bulging eyes)
Answer: D
Rationale: Graves’ Disease is an autoimmune form of hyperthyroidism caused by thyroid-
stimulating immunoglobulins that bind to TSH receptors. The unique clinical feature of
Graves’ is exophthalmos, which results from inflammation and accumulation of connective
tissue behind the eyes. Other symptoms include tachycardia, heat intolerance, and an
enlarged thyroid gland.
4. In the development of DKA, why does the body produce ketones?
A. The liver processes excess glucose into ketone bodies.
, B. Insulin deficiency leads to the breakdown of fats for energy in the absence of glucose
uptake.
C. Ketones are a byproduct of muscle protein catabolism.
D. Glucagon prevents the kidneys from excreting metabolic waste.
Answer: B
Rationale: In Diabetic Ketoacidosis (DKA), the body lacks sufficient insulin to move
glucose into the cells for fuel. To compensate, the body begins breaking down fatty acids, a
process that produces acidic ketones as a byproduct. This accumulation of ketones leads to
metabolic acidosis, which is a life-threatening emergency often seen in Type 1 diabetics.
5. What is the primary pathophysiology behind Cushing’s Syndrome?
A. Chronic exposure to excess levels of cortisol.
B. Deficiency of adrenocorticotropic hormone (ACTH).
C. Autoimmune destruction of the adrenal cortex.
D. Overproduction of aldosterone by the adrenal glands.
Answer: A
Rationale: Cushing’s Syndrome refers to the clinical manifestations of chronic exposure to
excessive glucocorticoids, primarily cortisol. This can be caused by an adrenal tumor, an
ACTH-secreting pituitary tumor, or long-term exogenous steroid use. Common signs
include central obesity, a ‘buffalo hump,’ and thin, easily bruised skin.
