NUR 631/NUR631 Final Exam V1 |
Advanced Physiology and Pathophysiology
Q&A with Rationale | Grand Canyon
University
1. A patient is diagnosed with secondary hyperparathyroidism. Which of the following
conditions is the most common cause of this disorder?
A. Pituitary adenoma
B. Chronic renal failure
C. Thyroid carcinoma
D. Vitamin D toxicity
Correct Answer: B
Expert Explanation: Chronic renal failure leads to a decrease in the activation of Vitamin
D and a decrease in phosphate excretion. This resulting hypocalcemia and
hyperphosphatemia persistently stimulate the parathyroid glands to release parathyroid
hormone. Over time, this compensatory mechanism leads to the development of secondary
hyperparathyroidism as the body attempts to maintain calcium levels.
2. Which electrolyte imbalance is most commonly associated with the release of Antidiuretic
Hormone (ADH) in the Syndrome of Inappropriate Antidiuretic Hormone (SIADH)?
A. Hypernatremia
,B. Hypocalcemia
C. Hyperkalemia
D. Hyponatremia
Correct Answer: D
Expert Explanation: SIADH causes the body to retain excess water due to high levels of
ADH acting on the renal collecting ducts. This water retention leads to a dilutional effect on
the sodium concentration in the blood, resulting in hyponatremia. The clinical
manifestations of this condition are primarily related to cerebral edema caused by the
osmotic shift of water into brain cells.
3. A patient with long-standing hypertension develops left ventricular hypertrophy. Which
cellular adaptation process does this represent?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia
D. Dysplasia
Correct Answer: A
Expert Explanation: Hypertrophy is an increase in the size of individual cells, which in
turn increases the size of the organ. In the heart, increased workload from systemic
hypertension forces cardiac myocytes to synthesize more proteins and filaments. Unlike
, hyperplasia, the number of myocytes does not increase, but their individual volume does to
accommodate the stress.
4. What is the primary pathophysiological mechanism behind Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Failure of the pituitary gland to signal the pancreas
C. Excessive glucagon secretion from alpha cells
D. Autoimmune destruction of pancreatic beta cells
Correct Answer: D
Expert Explanation: Type 1 Diabetes Mellitus is characterized by an absolute insulin
deficiency due to the immune-mediated destruction of insulin-producing beta cells in the
Islets of Langerhans. T-cells and autoantibodies target these cells, leading to a complete
loss of insulin production. This differs from Type 2, where the primary issue is resistance
rather than total absence of the hormone.
5. Which of the following occurs during the alarm stage of the General Adaptation Syndrome
(GAS)?
A. Increased parasympathetic activity
B. Release of catecholamines from the adrenal medulla
C. Decreased blood glucose levels
D. Atrophy of the adrenal cortex
Advanced Physiology and Pathophysiology
Q&A with Rationale | Grand Canyon
University
1. A patient is diagnosed with secondary hyperparathyroidism. Which of the following
conditions is the most common cause of this disorder?
A. Pituitary adenoma
B. Chronic renal failure
C. Thyroid carcinoma
D. Vitamin D toxicity
Correct Answer: B
Expert Explanation: Chronic renal failure leads to a decrease in the activation of Vitamin
D and a decrease in phosphate excretion. This resulting hypocalcemia and
hyperphosphatemia persistently stimulate the parathyroid glands to release parathyroid
hormone. Over time, this compensatory mechanism leads to the development of secondary
hyperparathyroidism as the body attempts to maintain calcium levels.
2. Which electrolyte imbalance is most commonly associated with the release of Antidiuretic
Hormone (ADH) in the Syndrome of Inappropriate Antidiuretic Hormone (SIADH)?
A. Hypernatremia
,B. Hypocalcemia
C. Hyperkalemia
D. Hyponatremia
Correct Answer: D
Expert Explanation: SIADH causes the body to retain excess water due to high levels of
ADH acting on the renal collecting ducts. This water retention leads to a dilutional effect on
the sodium concentration in the blood, resulting in hyponatremia. The clinical
manifestations of this condition are primarily related to cerebral edema caused by the
osmotic shift of water into brain cells.
3. A patient with long-standing hypertension develops left ventricular hypertrophy. Which
cellular adaptation process does this represent?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia
D. Dysplasia
Correct Answer: A
Expert Explanation: Hypertrophy is an increase in the size of individual cells, which in
turn increases the size of the organ. In the heart, increased workload from systemic
hypertension forces cardiac myocytes to synthesize more proteins and filaments. Unlike
, hyperplasia, the number of myocytes does not increase, but their individual volume does to
accommodate the stress.
4. What is the primary pathophysiological mechanism behind Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Failure of the pituitary gland to signal the pancreas
C. Excessive glucagon secretion from alpha cells
D. Autoimmune destruction of pancreatic beta cells
Correct Answer: D
Expert Explanation: Type 1 Diabetes Mellitus is characterized by an absolute insulin
deficiency due to the immune-mediated destruction of insulin-producing beta cells in the
Islets of Langerhans. T-cells and autoantibodies target these cells, leading to a complete
loss of insulin production. This differs from Type 2, where the primary issue is resistance
rather than total absence of the hormone.
5. Which of the following occurs during the alarm stage of the General Adaptation Syndrome
(GAS)?
A. Increased parasympathetic activity
B. Release of catecholamines from the adrenal medulla
C. Decreased blood glucose levels
D. Atrophy of the adrenal cortex
