NR 507 Final Exam: Advanced Pathophysiology V2 -
Chamberlain University Updated and Latest Questions and
Correct Answers with Rationale
1. A patient is diagnosed with Diabetes Insipidus. Which pathophysiological mechanism is primarily
responsible for the clinical manifestations of this condition?
A. Excessive secretion of antidiuretic hormone (ADH)
B. Insufficiency of antidiuretic hormone (ADH) or kidney resistance
C. Autoimmune destruction of the pancreas
D. Overproduction of aldosterone by the adrenal cortex
Ans: B
Explanation: Diabetes insipidus results from a deficiency of ADH or a decreased renal response to ADH.
This hormone is essential for the kidneys to reabsorb water back into the bloodstream. Without sufficient
ADH action, the body excretes large volumes of dilute urine. Patients typically present with extreme
thirst and polyuria. Correct identification of the type, neurogenic or nephrogenic, is vital for treatment.
2. In the context of the Syndrome of Inappropriate Antidiuretic Hormone (SIADH), which electrolyte
imbalance is most commonly observed?
A. Hyperkalemia
B. Hypocalcemia
C. Hyponatremia
D. Hypermagnesemia
Ans: C
,Explanation: SIADH involves the excessive release of antidiuretic hormone regardless of serum
osmolality. This leads to significant water retention and dilutional hyponatremia. The kidneys continue to
excrete sodium despite the low serum levels. Clinical symptoms often include confusion, seizures, and
muscle cramps due to cellular swelling. Managing fluid intake is a primary intervention for these patients.
3. Which of the following describes the primary defect in Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Excessive glucagon production by alpha cells
C. Decreased glucose absorption in the small intestine
D. Autoimmune destruction of pancreatic beta cells
Ans: D
Explanation: Type 1 Diabetes is characterized by an absolute deficiency of insulin production. This
occurs because the immune system attacks and destroys the insulin-producing beta cells in the pancreas.
Genetic predisposition and environmental triggers are thought to play significant roles. Without insulin,
glucose cannot enter cells, leading to hyperglycemia and metabolic derangement. Lifelong exogenous
insulin therapy is required for survival.
4. What is the hallmark physiological change associated with Cushing Syndrome?
A. Chronic cortisol deficiency
B. Hypersecretion of growth hormone
C. Excessive levels of circulating cortisol
D. Hyposecretion of aldosterone
Ans: C
, Explanation: Cushing syndrome results from chronic exposure to excessive levels of cortisol. This can be
caused by adrenal tumors or prolonged use of glucocorticoid medications. Symptoms include a moon
face, buffalo hump, and central obesity. Cortisol impacts metabolism, immune function, and stress
responses throughout the body. Diagnosis often involves measuring free cortisol in the urine or saliva.
5. Which statement best describes the pathophysiology of Graves’ Disease?
A. Autoimmune destruction of the thyroid gland leading to hypothyroidism
B. Thyroid-stimulating immunoglobulins (TSI) causing hyperthyroidism
C. Iodine deficiency causing goiter formation
D. Benign adenoma secreting parathyroid hormone
Ans: B
Explanation: Graves’ disease is an autoimmune disorder that leads to overactivity of the thyroid gland. It
is caused by antibodies that bind to and activate the TSH receptors. This stimulation results in excessive
synthesis and release of thyroid hormones T3 and T4. Physical findings include a diffuse goiter and
potentially exophthalmos. Treatment usually involves antithyroid medications, radioactive iodine, or
surgery.
6. A patient has arterial blood gas results: pH 7.28, PaCO2 35, HCO3 18. This represents which acid-base
imbalance?
A. Respiratory Acidosis
B. Metabolic Acidosis
C. Metabolic Alkalosis
D. Respiratory Alkalosis
Ans: B
Chamberlain University Updated and Latest Questions and
Correct Answers with Rationale
1. A patient is diagnosed with Diabetes Insipidus. Which pathophysiological mechanism is primarily
responsible for the clinical manifestations of this condition?
A. Excessive secretion of antidiuretic hormone (ADH)
B. Insufficiency of antidiuretic hormone (ADH) or kidney resistance
C. Autoimmune destruction of the pancreas
D. Overproduction of aldosterone by the adrenal cortex
Ans: B
Explanation: Diabetes insipidus results from a deficiency of ADH or a decreased renal response to ADH.
This hormone is essential for the kidneys to reabsorb water back into the bloodstream. Without sufficient
ADH action, the body excretes large volumes of dilute urine. Patients typically present with extreme
thirst and polyuria. Correct identification of the type, neurogenic or nephrogenic, is vital for treatment.
2. In the context of the Syndrome of Inappropriate Antidiuretic Hormone (SIADH), which electrolyte
imbalance is most commonly observed?
A. Hyperkalemia
B. Hypocalcemia
C. Hyponatremia
D. Hypermagnesemia
Ans: C
,Explanation: SIADH involves the excessive release of antidiuretic hormone regardless of serum
osmolality. This leads to significant water retention and dilutional hyponatremia. The kidneys continue to
excrete sodium despite the low serum levels. Clinical symptoms often include confusion, seizures, and
muscle cramps due to cellular swelling. Managing fluid intake is a primary intervention for these patients.
3. Which of the following describes the primary defect in Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Excessive glucagon production by alpha cells
C. Decreased glucose absorption in the small intestine
D. Autoimmune destruction of pancreatic beta cells
Ans: D
Explanation: Type 1 Diabetes is characterized by an absolute deficiency of insulin production. This
occurs because the immune system attacks and destroys the insulin-producing beta cells in the pancreas.
Genetic predisposition and environmental triggers are thought to play significant roles. Without insulin,
glucose cannot enter cells, leading to hyperglycemia and metabolic derangement. Lifelong exogenous
insulin therapy is required for survival.
4. What is the hallmark physiological change associated with Cushing Syndrome?
A. Chronic cortisol deficiency
B. Hypersecretion of growth hormone
C. Excessive levels of circulating cortisol
D. Hyposecretion of aldosterone
Ans: C
, Explanation: Cushing syndrome results from chronic exposure to excessive levels of cortisol. This can be
caused by adrenal tumors or prolonged use of glucocorticoid medications. Symptoms include a moon
face, buffalo hump, and central obesity. Cortisol impacts metabolism, immune function, and stress
responses throughout the body. Diagnosis often involves measuring free cortisol in the urine or saliva.
5. Which statement best describes the pathophysiology of Graves’ Disease?
A. Autoimmune destruction of the thyroid gland leading to hypothyroidism
B. Thyroid-stimulating immunoglobulins (TSI) causing hyperthyroidism
C. Iodine deficiency causing goiter formation
D. Benign adenoma secreting parathyroid hormone
Ans: B
Explanation: Graves’ disease is an autoimmune disorder that leads to overactivity of the thyroid gland. It
is caused by antibodies that bind to and activate the TSH receptors. This stimulation results in excessive
synthesis and release of thyroid hormones T3 and T4. Physical findings include a diffuse goiter and
potentially exophthalmos. Treatment usually involves antithyroid medications, radioactive iodine, or
surgery.
6. A patient has arterial blood gas results: pH 7.28, PaCO2 35, HCO3 18. This represents which acid-base
imbalance?
A. Respiratory Acidosis
B. Metabolic Acidosis
C. Metabolic Alkalosis
D. Respiratory Alkalosis
Ans: B
