NUR 631/NUR631 Exam 3 V3 | 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 clinical signs of fluid
volume overload. Which condition is most likely responsible for these findings?
A. Diabetes Insipidus
B. Cushing Syndrome
C. Addison’s Disease
D. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
Answer: D
Rationale: SIADH involves the excessive secretion of antidiuretic hormone, leading to
significant water retention. This physiological process causes dilutional hyponatremia and
increases total body water. It is commonly associated with certain cancers or central
nervous system disorders.
2. Which pathological mechanism primarily distinguishes Type 1 Diabetes Mellitus from Type
2 Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Excessive glucagon secretion from alpha cells
,D. Decreased glucose absorption in the gut
Answer: A
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency due
to autoimmune destruction. This process typically involves T-cell mediated attacks on the
pancreatic beta cells. In contrast, Type 2 is primarily driven by insulin resistance and
relative insulin deficiency.
3. In a patient with Graves’ disease, what is the primary cause of the hyperthyroid state?
A. Pituitary adenoma secreting TSH
B. Iodine deficiency in the diet
C. Thyroid-stimulating immunoglobulins (TSI)
D. Destruction of thyroid follicles by T-cells
Answer: C
Rationale: Graves’ disease is an autoimmune disorder where antibodies known as TSI
mimic the action of TSH. These antibodies bind to the TSH receptor, leading to the
overproduction of thyroid hormones. This result in the classic symptoms of
hyperthyroidism, including tachycardia and weight loss.
4. A patient is diagnosed with primary hypothyroidism. Which lab result pattern is most
consistent with this diagnosis?
A. Low TSH and Low T4
, B. High TSH and Low T4
C. High TSH and High T4
D. Low TSH and High T4
Answer: B
Rationale: In primary hypothyroidism, the thyroid gland itself is unable to produce
sufficient hormones. Because the pituitary gland is functioning normally, it increases TSH
secretion to stimulate the failing thyroid. This results in the characteristic finding of
elevated TSH and low circulating T4 levels.
5. Which condition is characterized by an excess of growth hormone (GH) in an adult after the
epiphyseal plates have closed?
A. Gigantism
B. Dwarfism
C. Cretinism
D. Acromegaly
Answer: D
Rationale: Acromegaly occurs when there is excessive growth hormone secretion in
adulthood. Since the long bones can no longer grow in length, the bones increase in
thickness and soft tissues enlarge. This condition is usually caused by a benign pituitary
adenoma.
Physiology and Pathophysiology Q&A with
Rationale | Grand Canyon University
1. A patient presents with a serum sodium level of 120 mEq/L and clinical signs of fluid
volume overload. Which condition is most likely responsible for these findings?
A. Diabetes Insipidus
B. Cushing Syndrome
C. Addison’s Disease
D. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
Answer: D
Rationale: SIADH involves the excessive secretion of antidiuretic hormone, leading to
significant water retention. This physiological process causes dilutional hyponatremia and
increases total body water. It is commonly associated with certain cancers or central
nervous system disorders.
2. Which pathological mechanism primarily distinguishes Type 1 Diabetes Mellitus from Type
2 Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Excessive glucagon secretion from alpha cells
,D. Decreased glucose absorption in the gut
Answer: A
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency due
to autoimmune destruction. This process typically involves T-cell mediated attacks on the
pancreatic beta cells. In contrast, Type 2 is primarily driven by insulin resistance and
relative insulin deficiency.
3. In a patient with Graves’ disease, what is the primary cause of the hyperthyroid state?
A. Pituitary adenoma secreting TSH
B. Iodine deficiency in the diet
C. Thyroid-stimulating immunoglobulins (TSI)
D. Destruction of thyroid follicles by T-cells
Answer: C
Rationale: Graves’ disease is an autoimmune disorder where antibodies known as TSI
mimic the action of TSH. These antibodies bind to the TSH receptor, leading to the
overproduction of thyroid hormones. This result in the classic symptoms of
hyperthyroidism, including tachycardia and weight loss.
4. A patient is diagnosed with primary hypothyroidism. Which lab result pattern is most
consistent with this diagnosis?
A. Low TSH and Low T4
, B. High TSH and Low T4
C. High TSH and High T4
D. Low TSH and High T4
Answer: B
Rationale: In primary hypothyroidism, the thyroid gland itself is unable to produce
sufficient hormones. Because the pituitary gland is functioning normally, it increases TSH
secretion to stimulate the failing thyroid. This results in the characteristic finding of
elevated TSH and low circulating T4 levels.
5. Which condition is characterized by an excess of growth hormone (GH) in an adult after the
epiphyseal plates have closed?
A. Gigantism
B. Dwarfism
C. Cretinism
D. Acromegaly
Answer: D
Rationale: Acromegaly occurs when there is excessive growth hormone secretion in
adulthood. Since the long bones can no longer grow in length, the bones increase in
thickness and soft tissues enlarge. This condition is usually caused by a benign pituitary
adenoma.
