NR 412 Exam 2: Pathophysiology V3 Updated and Latest
Questions and Correct Answers - Regis University
1. A patient is diagnosed with Type 1 Diabetes Mellitus. Which mechanism best describes
the underlying pathophysiology?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Overproduction of glucagon by alpha cells
D. Excessive intake of dietary carbohydrates
Correct Answer: A
Explanation: Type 1 diabetes results from a T-cell mediated autoimmune attack on the pancreas. This
process leads to the destruction of insulin-producing beta cells. Consequently, there is an absolute
deficiency of insulin in the body. Without insulin, glucose cannot enter cells for energy production. This
leads to hyperglycemia and the mobilization of fatty acids. The lack of insulin also prevents the inhibition
of glucagon. Genetic susceptibility and environmental triggers are common causative factors. Patients
usually present with polyuria, polydipsia, and polyphagia. Exogenous insulin therapy is required for life.
Understanding this cellular destruction is vital for nursing care.
2. Which clinical finding is most characteristic of Syndrome of Inappropriate Antidiuretic
Hormone (SIADH)?
A. Serum hyperosmolality
B. Hypernatremia
C. Excessive urinary output
D. Dilutional hyponatremia
Correct Answer: D
Explanation: SIADH involves the excessive release of antidiuretic hormone from the pituitary. This
hormone causes the kidneys to reabsorb water back into the blood. As a result, the intravascular volume
increases significantly. This volume expansion leads to dilutional hyponatremia in the patient. Urinary
output is typically decreased and the urine is highly concentrated. Serum osmolality drops because the
blood is diluted by excess water. Common causes include small cell lung cancer and brain injuries.
Symptoms often include confusion, seizures, and muscle weakness. Treatment usually focuses on strict
fluid restriction and underlying cause. Nurses must monitor sodium levels closely to prevent neurological
injury.
,3. Graves’ disease is an autoimmune condition characterized by which of the following?
A. Production of antibodies that mimic TSH
B. Destruction of thyroid follicular cells
C. Inadequate iodine intake
D. Hypersecretion of TRH from the hypothalamus
Correct Answer: A
Explanation: Graves’ disease is the most common cause of hyperthyroidism. The body produces thyroid-
stimulating immunoglobulins that bind to TSH receptors. These antibodies stimulate the thyroid gland to
grow and overproduce hormones. This leads to high levels of T3 and T4 in the blood. Patients often
exhibit a goiter due to glandular hypertrophy. Exophthalmos is a unique clinical sign seen in these
patients. Symptoms include weight loss, tachycardia, and heat intolerance. The negative feedback loop
causes a suppressed serum TSH level. Radioactive iodine or surgery may be necessary for treatment.
Consistent monitoring of metabolic status is essential for patient safety.
4. Which laboratory finding would confirm a diagnosis of Hashimoto’s Thyroiditis?
A. Low TSH and high T4
B. High TSH and high T4
C. High TSH and low T4
D. Low TSH and low T4
Correct Answer: C
Explanation: Hashimoto’s thyroiditis is a chronic autoimmune form of hypothyroidism. The immune
system targets and destroys the thyroid gland tissue. As the thyroid fails, it produces less T3 and T4
hormones. The pituitary gland senses this deficit and increases TSH production. Therefore, a high TSH
with a low T4 is diagnostic. This condition is the leading cause of goiter in iodine-replete areas. Clinical
signs include fatigue, weight gain, and cold intolerance. Myxedema coma is the most severe potential
complication. Replacement with levothyroxine is the standard medical treatment. Nurses should educate
patients on the lifelong nature of therapy.
5. A patient presents with a ‘moon face,’ ‘buffalo hump,’ and abdominal striae. Which
condition is suspected?
A. Addison’s Disease
B. Pheochromocytoma
C. Cushing’s Syndrome
D. Hypoparathyroidism
Correct Answer: C
, Explanation: Cushing’s syndrome results from chronic exposure to excess glucocorticoids. This may be
caused by a pituitary tumor or exogenous steroids. Cortisol causes fat redistribution to the face and
upper back. It also leads to protein wasting and thinning of the skin. Purple striae on the abdomen are a
classic clinical finding. Excess cortisol impairs the immune response and wound healing. It also
contributes to hypertension and secondary diabetes mellitus. Diagnosis involves checking 24-hour
urinary cortisol or dexamethasone suppression. Treatment involves removing the source of excess
hormone production. Nursing care focuses on infection prevention and glucose management.
6. What is the primary pathophysiology behind Diabetes Insipidus (DI)?
A. Overproduction of insulin by the pancreas
B. Chronic renal failure leading to polyuria
C. Deficiency of or decreased response to ADH
D. High intake of sodium leading to thirst
Correct Answer: C
Explanation: Diabetes insipidus is characterized by an inability to concentrate urine. This occurs due to a
lack of antidiuretic hormone (ADH). Neurogenic DI involves a failure of the pituitary to secrete ADH.
Nephrogenic DI occurs when the kidneys do not respond to ADH. Without ADH, the distal tubules do not
reabsorb water. This leads to the excretion of large volumes of dilute urine. Patients experience extreme
thirst and severe polyuria. Dehydration and hypernatremia are major risks for these patients.
Desmopressin is the pharmacological treatment for neurogenic cases. Nurses must monitor fluid intake
and output very strictly.
7. In Addison’s disease, the lack of which hormone causes hyperkalemia and hyponatremia?
A. Cortisol
B. Thyroxine
C. Aldosterone
D. Insulin
Correct Answer: C
Explanation: Addison’s disease is characterized by primary adrenal insufficiency. The adrenal cortex
fails to produce cortisol and aldosterone. Aldosterone is responsible for sodium retention and potassium
excretion. Its absence leads to salt wasting and potassium retention. This results in the characteristic
hyponatremia and hyperkalemia. Low cortisol levels lead to hypoglycemia and poor stress response.
Hyperpigmentation of the skin is often observed in these patients. Adrenal crisis is a life-threatening
complication of this condition. Treatment requires lifelong replacement of glucocorticoids and
mineralocorticoids. Patients should carry an emergency medical alert card at all times.
Questions and Correct Answers - Regis University
1. A patient is diagnosed with Type 1 Diabetes Mellitus. Which mechanism best describes
the underlying pathophysiology?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Overproduction of glucagon by alpha cells
D. Excessive intake of dietary carbohydrates
Correct Answer: A
Explanation: Type 1 diabetes results from a T-cell mediated autoimmune attack on the pancreas. This
process leads to the destruction of insulin-producing beta cells. Consequently, there is an absolute
deficiency of insulin in the body. Without insulin, glucose cannot enter cells for energy production. This
leads to hyperglycemia and the mobilization of fatty acids. The lack of insulin also prevents the inhibition
of glucagon. Genetic susceptibility and environmental triggers are common causative factors. Patients
usually present with polyuria, polydipsia, and polyphagia. Exogenous insulin therapy is required for life.
Understanding this cellular destruction is vital for nursing care.
2. Which clinical finding is most characteristic of Syndrome of Inappropriate Antidiuretic
Hormone (SIADH)?
A. Serum hyperosmolality
B. Hypernatremia
C. Excessive urinary output
D. Dilutional hyponatremia
Correct Answer: D
Explanation: SIADH involves the excessive release of antidiuretic hormone from the pituitary. This
hormone causes the kidneys to reabsorb water back into the blood. As a result, the intravascular volume
increases significantly. This volume expansion leads to dilutional hyponatremia in the patient. Urinary
output is typically decreased and the urine is highly concentrated. Serum osmolality drops because the
blood is diluted by excess water. Common causes include small cell lung cancer and brain injuries.
Symptoms often include confusion, seizures, and muscle weakness. Treatment usually focuses on strict
fluid restriction and underlying cause. Nurses must monitor sodium levels closely to prevent neurological
injury.
,3. Graves’ disease is an autoimmune condition characterized by which of the following?
A. Production of antibodies that mimic TSH
B. Destruction of thyroid follicular cells
C. Inadequate iodine intake
D. Hypersecretion of TRH from the hypothalamus
Correct Answer: A
Explanation: Graves’ disease is the most common cause of hyperthyroidism. The body produces thyroid-
stimulating immunoglobulins that bind to TSH receptors. These antibodies stimulate the thyroid gland to
grow and overproduce hormones. This leads to high levels of T3 and T4 in the blood. Patients often
exhibit a goiter due to glandular hypertrophy. Exophthalmos is a unique clinical sign seen in these
patients. Symptoms include weight loss, tachycardia, and heat intolerance. The negative feedback loop
causes a suppressed serum TSH level. Radioactive iodine or surgery may be necessary for treatment.
Consistent monitoring of metabolic status is essential for patient safety.
4. Which laboratory finding would confirm a diagnosis of Hashimoto’s Thyroiditis?
A. Low TSH and high T4
B. High TSH and high T4
C. High TSH and low T4
D. Low TSH and low T4
Correct Answer: C
Explanation: Hashimoto’s thyroiditis is a chronic autoimmune form of hypothyroidism. The immune
system targets and destroys the thyroid gland tissue. As the thyroid fails, it produces less T3 and T4
hormones. The pituitary gland senses this deficit and increases TSH production. Therefore, a high TSH
with a low T4 is diagnostic. This condition is the leading cause of goiter in iodine-replete areas. Clinical
signs include fatigue, weight gain, and cold intolerance. Myxedema coma is the most severe potential
complication. Replacement with levothyroxine is the standard medical treatment. Nurses should educate
patients on the lifelong nature of therapy.
5. A patient presents with a ‘moon face,’ ‘buffalo hump,’ and abdominal striae. Which
condition is suspected?
A. Addison’s Disease
B. Pheochromocytoma
C. Cushing’s Syndrome
D. Hypoparathyroidism
Correct Answer: C
, Explanation: Cushing’s syndrome results from chronic exposure to excess glucocorticoids. This may be
caused by a pituitary tumor or exogenous steroids. Cortisol causes fat redistribution to the face and
upper back. It also leads to protein wasting and thinning of the skin. Purple striae on the abdomen are a
classic clinical finding. Excess cortisol impairs the immune response and wound healing. It also
contributes to hypertension and secondary diabetes mellitus. Diagnosis involves checking 24-hour
urinary cortisol or dexamethasone suppression. Treatment involves removing the source of excess
hormone production. Nursing care focuses on infection prevention and glucose management.
6. What is the primary pathophysiology behind Diabetes Insipidus (DI)?
A. Overproduction of insulin by the pancreas
B. Chronic renal failure leading to polyuria
C. Deficiency of or decreased response to ADH
D. High intake of sodium leading to thirst
Correct Answer: C
Explanation: Diabetes insipidus is characterized by an inability to concentrate urine. This occurs due to a
lack of antidiuretic hormone (ADH). Neurogenic DI involves a failure of the pituitary to secrete ADH.
Nephrogenic DI occurs when the kidneys do not respond to ADH. Without ADH, the distal tubules do not
reabsorb water. This leads to the excretion of large volumes of dilute urine. Patients experience extreme
thirst and severe polyuria. Dehydration and hypernatremia are major risks for these patients.
Desmopressin is the pharmacological treatment for neurogenic cases. Nurses must monitor fluid intake
and output very strictly.
7. In Addison’s disease, the lack of which hormone causes hyperkalemia and hyponatremia?
A. Cortisol
B. Thyroxine
C. Aldosterone
D. Insulin
Correct Answer: C
Explanation: Addison’s disease is characterized by primary adrenal insufficiency. The adrenal cortex
fails to produce cortisol and aldosterone. Aldosterone is responsible for sodium retention and potassium
excretion. Its absence leads to salt wasting and potassium retention. This results in the characteristic
hyponatremia and hyperkalemia. Low cortisol levels lead to hypoglycemia and poor stress response.
Hyperpigmentation of the skin is often observed in these patients. Adrenal crisis is a life-threatening
complication of this condition. Treatment requires lifelong replacement of glucocorticoids and
mineralocorticoids. Patients should carry an emergency medical alert card at all times.
