NR 412 Exam 2: Pathophysiology V1 Updated and Latest
Questions and Correct Answers - Regis University
1. Which of the following describes the primary pathophysiology of Type 1 Diabetes
Mellitus?
A. Insulin resistance in peripheral tissues.
B. Impaired insulin secretion due to obesity.
C. Excessive glucagon production by alpha cells.
D. Autoimmune destruction of pancreatic beta cells.
Correct Answer: D
Explanation: Type 1 Diabetes Mellitus is characterized by an absolute deficiency of insulin production.
This occurs because the body’s immune system mistakenly attacks and destroys the insulin-producing
beta cells in the pancreas. Genetic predisposition and environmental triggers are often cited as
contributing factors to this autoimmune response. Without insulin, glucose cannot enter cells to be used
for energy. This leads to a state of hyperglycemia in the bloodstream. It is distinct from Type 2 diabetes,
which primarily involves insulin resistance. Patients with Type 1 diabetes require exogenous insulin for
survival. Complications such as diabetic ketoacidosis can occur if insulin is not administered. Diagnosis
often occurs in childhood or adolescence but can happen at any age. Comprehensive management
involves blood glucose monitoring, insulin therapy, and dietary control.
2. A patient presents with polyuria, polydipsia, and a fruity breath odor. Which condition is
most likely?
A. Diabetic Ketoacidosis (DKA)
B. Hypoglycemic shock
C. Hyperosmolar Hyperglycemic Nonketotic Syndrome (HHNS)
D. Diabetes Insipidus
Correct Answer: A
Explanation: Diabetic Ketoacidosis is a life-threatening complication primarily seen in Type 1 diabetics.
It results from a profound lack of insulin and an increase in counter-regulatory hormones. This state
leads to the breakdown of fats for energy, producing ketones as a byproduct. The accumulation of
ketones causes metabolic acidosis and a decrease in blood pH. The fruity breath odor is caused by the
expiration of acetone, a type of ketone. Polyuria and polydipsia occur due to osmotic diuresis caused by
high blood sugar levels. Kussmaul respirations are often present as the body attempts to compensate for
acidosis. Management involves fluid resuscitation, insulin administration, and electrolyte replacement.
Potassium levels must be monitored closely during treatment to prevent cardiac arrhythmias. DKA
requires immediate medical intervention to prevent coma or death.
,3. What is the hallmark physiological change in Graves’ Disease?
A. Destruction of the thyroid gland by T-cells.
B. Pituitary adenoma secreting excess TSH.
C. Iodine deficiency leading to goiter.
D. Production of thyroid-stimulating immunoglobulins (TSI).
Correct Answer: D
Explanation: Graves’ disease is the most common cause of hyperthyroidism worldwide. It is an
autoimmune disorder where the body produces antibodies that mimic thyroid-stimulating hormone.
These antibodies, known as thyroid-stimulating immunoglobulins, bind to TSH receptors on the thyroid
gland. This binding triggers the continuous and excessive release of thyroid hormones T3 and T4. Clinical
manifestations include weight loss, tachycardia, heat intolerance, and exophthalmos. The basal metabolic
rate is significantly increased in these patients. It is categorized as a Type II hypersensitivity reaction.
Goiter may be present due to the constant stimulation of the thyroid gland. Treatment options include
antithyroid medications, radioactive iodine therapy, or surgery. Managing the symptoms of
thyrotoxicosis is critical to prevent a thyroid storm.
4. Which condition is characterized by the hypersecretion of cortisol due to an adrenal
tumor or exogenous steroids?
A. Addison’s Disease
B. Pheochromocytoma
C. Conn’s Syndrome
D. Cushing’s Syndrome
Correct Answer: D
Explanation: Cushing’s Syndrome refers to the clinical state resulting from chronic exposure to excessive
cortisol. This can be caused by an adrenal gland tumor or long-term use of glucocorticoid medications.
Common physical features include a moon face, buffalo hump, and central obesity. Patients often
experience thin skin, easy bruising, and purple striae on the abdomen. Cortisol excess leads to
hyperglycemia by stimulating gluconeogenesis in the liver. It also causes muscle wasting and
osteoporosis due to protein breakdown. Hypertension is common because cortisol enhances the effect of
catecholamines on blood vessels. The immune system is often suppressed, increasing the risk of
infections. Diagnosis involves measuring 24-hour urinary free cortisol or dexamethasone suppression
tests. Treatment focuses on addressing the underlying cause of the hormone excess.
, 5. In Addison’s Disease, the primary deficiency involves which of the following?
A. Insulin and Glucagon
B. Epinephrine and Norepinephrine
C. Cortisol and Aldosterone
D. Antidiuretic Hormone and Oxytocin
Correct Answer: C
Explanation: Addison’s disease is a primary adrenal insufficiency caused by the destruction of the
adrenal cortex. This leads to a deficiency in both glucocorticoids like cortisol and mineralocorticoids like
aldosterone. Symptoms include fatigue, muscle weakness, and hyperpigmentation of the skin.
Hyperpigmentation occurs because high levels of ACTH stimulate melanocytes. Aldosterone deficiency
results in sodium wasting and potassium retention in the kidneys. This often leads to hypotension,
dehydration, and salt cravings. Patients are at risk for an adrenal crisis during periods of extreme stress
or illness. Adrenal crisis is a medical emergency characterized by vascular collapse and severe electrolyte
imbalance. Hormone replacement therapy is necessary for the remainder of the patient’s life. Proper
education on stress-dose medication is vital for patient safety.
6. SIADH (Syndrome of Inappropriate Antidiuretic Hormone) is most closely associated with
which electrolyte imbalance?
A. Hyponatremia
B. Hypokalemia
C. Hypernatremia
D. Hypercalcemia
Correct Answer: A
Explanation: SIADH involves the excessive release of antidiuretic hormone from the posterior pituitary
or ectopic sources. This excess ADH causes the kidneys to reabsorb too much water regardless of serum
osmolality. The resulting fluid retention leads to dilutional hyponatremia in the blood. Patients do not
typically show edema because the fluid is distributed throughout the body. Symptoms of hyponatremia
include headache, confusion, and in severe cases, seizures or coma. Urine output is typically low and
highly concentrated with high specific gravity. Causes can include small cell lung cancer, head trauma, or
certain medications. Management primarily focuses on fluid restriction to prevent further dilution.
Hypertonic saline may be used cautiously in symptomatic patients to raise sodium levels. Monitoring
neurological status is the highest priority for these patients.
Questions and Correct Answers - Regis University
1. Which of the following describes the primary pathophysiology of Type 1 Diabetes
Mellitus?
A. Insulin resistance in peripheral tissues.
B. Impaired insulin secretion due to obesity.
C. Excessive glucagon production by alpha cells.
D. Autoimmune destruction of pancreatic beta cells.
Correct Answer: D
Explanation: Type 1 Diabetes Mellitus is characterized by an absolute deficiency of insulin production.
This occurs because the body’s immune system mistakenly attacks and destroys the insulin-producing
beta cells in the pancreas. Genetic predisposition and environmental triggers are often cited as
contributing factors to this autoimmune response. Without insulin, glucose cannot enter cells to be used
for energy. This leads to a state of hyperglycemia in the bloodstream. It is distinct from Type 2 diabetes,
which primarily involves insulin resistance. Patients with Type 1 diabetes require exogenous insulin for
survival. Complications such as diabetic ketoacidosis can occur if insulin is not administered. Diagnosis
often occurs in childhood or adolescence but can happen at any age. Comprehensive management
involves blood glucose monitoring, insulin therapy, and dietary control.
2. A patient presents with polyuria, polydipsia, and a fruity breath odor. Which condition is
most likely?
A. Diabetic Ketoacidosis (DKA)
B. Hypoglycemic shock
C. Hyperosmolar Hyperglycemic Nonketotic Syndrome (HHNS)
D. Diabetes Insipidus
Correct Answer: A
Explanation: Diabetic Ketoacidosis is a life-threatening complication primarily seen in Type 1 diabetics.
It results from a profound lack of insulin and an increase in counter-regulatory hormones. This state
leads to the breakdown of fats for energy, producing ketones as a byproduct. The accumulation of
ketones causes metabolic acidosis and a decrease in blood pH. The fruity breath odor is caused by the
expiration of acetone, a type of ketone. Polyuria and polydipsia occur due to osmotic diuresis caused by
high blood sugar levels. Kussmaul respirations are often present as the body attempts to compensate for
acidosis. Management involves fluid resuscitation, insulin administration, and electrolyte replacement.
Potassium levels must be monitored closely during treatment to prevent cardiac arrhythmias. DKA
requires immediate medical intervention to prevent coma or death.
,3. What is the hallmark physiological change in Graves’ Disease?
A. Destruction of the thyroid gland by T-cells.
B. Pituitary adenoma secreting excess TSH.
C. Iodine deficiency leading to goiter.
D. Production of thyroid-stimulating immunoglobulins (TSI).
Correct Answer: D
Explanation: Graves’ disease is the most common cause of hyperthyroidism worldwide. It is an
autoimmune disorder where the body produces antibodies that mimic thyroid-stimulating hormone.
These antibodies, known as thyroid-stimulating immunoglobulins, bind to TSH receptors on the thyroid
gland. This binding triggers the continuous and excessive release of thyroid hormones T3 and T4. Clinical
manifestations include weight loss, tachycardia, heat intolerance, and exophthalmos. The basal metabolic
rate is significantly increased in these patients. It is categorized as a Type II hypersensitivity reaction.
Goiter may be present due to the constant stimulation of the thyroid gland. Treatment options include
antithyroid medications, radioactive iodine therapy, or surgery. Managing the symptoms of
thyrotoxicosis is critical to prevent a thyroid storm.
4. Which condition is characterized by the hypersecretion of cortisol due to an adrenal
tumor or exogenous steroids?
A. Addison’s Disease
B. Pheochromocytoma
C. Conn’s Syndrome
D. Cushing’s Syndrome
Correct Answer: D
Explanation: Cushing’s Syndrome refers to the clinical state resulting from chronic exposure to excessive
cortisol. This can be caused by an adrenal gland tumor or long-term use of glucocorticoid medications.
Common physical features include a moon face, buffalo hump, and central obesity. Patients often
experience thin skin, easy bruising, and purple striae on the abdomen. Cortisol excess leads to
hyperglycemia by stimulating gluconeogenesis in the liver. It also causes muscle wasting and
osteoporosis due to protein breakdown. Hypertension is common because cortisol enhances the effect of
catecholamines on blood vessels. The immune system is often suppressed, increasing the risk of
infections. Diagnosis involves measuring 24-hour urinary free cortisol or dexamethasone suppression
tests. Treatment focuses on addressing the underlying cause of the hormone excess.
, 5. In Addison’s Disease, the primary deficiency involves which of the following?
A. Insulin and Glucagon
B. Epinephrine and Norepinephrine
C. Cortisol and Aldosterone
D. Antidiuretic Hormone and Oxytocin
Correct Answer: C
Explanation: Addison’s disease is a primary adrenal insufficiency caused by the destruction of the
adrenal cortex. This leads to a deficiency in both glucocorticoids like cortisol and mineralocorticoids like
aldosterone. Symptoms include fatigue, muscle weakness, and hyperpigmentation of the skin.
Hyperpigmentation occurs because high levels of ACTH stimulate melanocytes. Aldosterone deficiency
results in sodium wasting and potassium retention in the kidneys. This often leads to hypotension,
dehydration, and salt cravings. Patients are at risk for an adrenal crisis during periods of extreme stress
or illness. Adrenal crisis is a medical emergency characterized by vascular collapse and severe electrolyte
imbalance. Hormone replacement therapy is necessary for the remainder of the patient’s life. Proper
education on stress-dose medication is vital for patient safety.
6. SIADH (Syndrome of Inappropriate Antidiuretic Hormone) is most closely associated with
which electrolyte imbalance?
A. Hyponatremia
B. Hypokalemia
C. Hypernatremia
D. Hypercalcemia
Correct Answer: A
Explanation: SIADH involves the excessive release of antidiuretic hormone from the posterior pituitary
or ectopic sources. This excess ADH causes the kidneys to reabsorb too much water regardless of serum
osmolality. The resulting fluid retention leads to dilutional hyponatremia in the blood. Patients do not
typically show edema because the fluid is distributed throughout the body. Symptoms of hyponatremia
include headache, confusion, and in severe cases, seizures or coma. Urine output is typically low and
highly concentrated with high specific gravity. Causes can include small cell lung cancer, head trauma, or
certain medications. Management primarily focuses on fluid restriction to prevent further dilution.
Hypertonic saline may be used cautiously in symptomatic patients to raise sodium levels. Monitoring
neurological status is the highest priority for these patients.
