NUR 631/NUR631 Exam 4 V1 | Advanced
Physiology and Pathophysiology Q&A with
Rationale | Grand Canyon University
1. A patient presents with a serum sodium level of 120 mEq/L and high urine osmolality.
Which condition is most consistent with these findings?
A. Diabetes Insipidus
B. Conn Syndrome
C. Addison’s Disease
D. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
Answer: D
Rationale: SIADH involves the excessive release of antidiuretic hormone regardless of
serum osmolality. This results in significant water retention and dilutional hyponatremia.
The kidneys continue to excrete sodium while retaining water, leading to concentrated
urine.
2. Which pathological mechanism is responsible for the development of Type 1 Diabetes
Mellitus?
A. Insulin resistance in peripheral tissues
B. Excessive cortisol production
C. Hypersecretion of glucagon from alpha cells
,D. Autoimmune destruction of pancreatic beta cells
Answer: D
Rationale: Type 1 Diabetes Mellitus is primarily an autoimmune disease where T-cells
attack and destroy insulin-producing beta cells in the pancreas. This leads to an absolute
insulin deficiency, requiring exogenous insulin for survival. The onset is usually abrupt and
often occurs in childhood or adolescence.
3. A patient with chronic kidney disease (CKD) develops anemia. What is the primary cause of
this condition?
A. Chronic blood loss during dialysis
B. Inadequate production of erythropoietin
C. Iron deficiency due to poor diet
D. Shortened lifespan of red blood cells
Answer: B
Rationale: The kidneys are the primary site for the production of erythropoietin, a
hormone that stimulates red blood cell production in the bone marrow. As renal function
declines in CKD, the production of this hormone decreases significantly. This results in a
normochromic, normocytic anemia that requires management with synthetic
erythropoiesis-stimulating agents.
, 4. Which thyroid disorder is characterized by the presence of thyroid-stimulating
immunoglobulins (TSI)?
A. Hashimoto’s Thyroiditis
B. Graves Disease
C. Myxedema Coma
D. Subacute Thyroiditis
Answer: B
Rationale: Graves disease is an autoimmune form of hyperthyroidism where the body
produces antibodies known as TSI. These antibodies bind to and activate the TSH receptors
on the thyroid gland, leading to excessive thyroid hormone synthesis. This often results in
clinical signs such as exophthalmos, goiter, and heat intolerance.
5. A patient exhibits ‘moon face,’ ‘buffalo hump,’ and abdominal striae. Which diagnosis is
most likely?
A. Cushing Syndrome
B. Addison’s Disease
C. Pheochromocytoma
D. Acromegaly
Answer: A
Physiology and Pathophysiology Q&A with
Rationale | Grand Canyon University
1. A patient presents with a serum sodium level of 120 mEq/L and high urine osmolality.
Which condition is most consistent with these findings?
A. Diabetes Insipidus
B. Conn Syndrome
C. Addison’s Disease
D. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
Answer: D
Rationale: SIADH involves the excessive release of antidiuretic hormone regardless of
serum osmolality. This results in significant water retention and dilutional hyponatremia.
The kidneys continue to excrete sodium while retaining water, leading to concentrated
urine.
2. Which pathological mechanism is responsible for the development of Type 1 Diabetes
Mellitus?
A. Insulin resistance in peripheral tissues
B. Excessive cortisol production
C. Hypersecretion of glucagon from alpha cells
,D. Autoimmune destruction of pancreatic beta cells
Answer: D
Rationale: Type 1 Diabetes Mellitus is primarily an autoimmune disease where T-cells
attack and destroy insulin-producing beta cells in the pancreas. This leads to an absolute
insulin deficiency, requiring exogenous insulin for survival. The onset is usually abrupt and
often occurs in childhood or adolescence.
3. A patient with chronic kidney disease (CKD) develops anemia. What is the primary cause of
this condition?
A. Chronic blood loss during dialysis
B. Inadequate production of erythropoietin
C. Iron deficiency due to poor diet
D. Shortened lifespan of red blood cells
Answer: B
Rationale: The kidneys are the primary site for the production of erythropoietin, a
hormone that stimulates red blood cell production in the bone marrow. As renal function
declines in CKD, the production of this hormone decreases significantly. This results in a
normochromic, normocytic anemia that requires management with synthetic
erythropoiesis-stimulating agents.
, 4. Which thyroid disorder is characterized by the presence of thyroid-stimulating
immunoglobulins (TSI)?
A. Hashimoto’s Thyroiditis
B. Graves Disease
C. Myxedema Coma
D. Subacute Thyroiditis
Answer: B
Rationale: Graves disease is an autoimmune form of hyperthyroidism where the body
produces antibodies known as TSI. These antibodies bind to and activate the TSH receptors
on the thyroid gland, leading to excessive thyroid hormone synthesis. This often results in
clinical signs such as exophthalmos, goiter, and heat intolerance.
5. A patient exhibits ‘moon face,’ ‘buffalo hump,’ and abdominal striae. Which diagnosis is
most likely?
A. Cushing Syndrome
B. Addison’s Disease
C. Pheochromocytoma
D. Acromegaly
Answer: A
