NU606 | NU606 Advanced Pathophysiology Exam 3
Version 3 | Questions with Correct Answers and
Expert Explanation for Each Question | Regis
1. Which of the following is the primary pathophysiologic mechanism of Type 1
Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Hypersecretion of glucagon by alpha cells
D. Decreased glucose absorption in the gut
Correct Answer: A
Expert Explanation: Type 1 Diabetes Mellitus is characterized by an absolute
insulin deficiency due to the destruction of insulin-producing beta cells in the
pancreas. This process is typically mediated by a T-cell-directed autoimmune attack
against various islet cell antigens. As a result, patients require exogenous insulin to
prevent ketoacidosis and sustain life.
2. A patient presents with serum sodium of 125 mEq/L, low serum osmolality, and
high urine osmolality. Which condition is most likely?
A. Diabetes Insipidus
B. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
,C. Addison’s Disease
D. Cushing’s Syndrome
Correct Answer: B
Expert Explanation: SIADH involves the excessive release of antidiuretic hormone,
which leads to water retention and dilutional hyponatremia. The high urine
osmolality indicates that the kidneys are inappropriately concentrating urine
despite a low serum osmolality. This electrolyte imbalance can lead to neurological
symptoms if the sodium levels drop too rapidly.
3. Which clinical manifestation is a hallmark of Graves’ disease?
A. Weight gain and bradycardia
B. Myxedema coma
C. Exophthalmos and heat intolerance
D. Hypocalcemia
Correct Answer: C
Expert Explanation: Graves’ disease is an autoimmune form of hyperthyroidism
caused by thyroid-stimulating immunoglobulins that bind to TSH receptors.
Exophthalmos, or bulging of the eyes, is a result of inflammation and tissue
,accumulation behind the eyeballs. Heat intolerance occurs because the elevated
thyroid hormone levels significantly increase the basal metabolic rate.
4. In Cushing’s syndrome, the physical finding of a ‘buffalo hump’ and ‘moon face’ is
caused by:
A. Excessive protein synthesis
B. Muscle hypertrophy in the face and neck
C. Severe water retention in the dermis
D. Redistribution of adipose tissue
Correct Answer: D
Expert Explanation: Cushing’s syndrome is characterized by chronic exposure to
excessive levels of cortisol. Cortisol promotes the redistribution of fat to the trunk,
face, and cervical spine area, leading to these classic physical signs. Additionally,
high cortisol levels stimulate gluconeogenesis, which often leads to hyperglycemia
and muscle wasting in the extremities.
5. Which of the following describes the pathophysiology of Addison’s disease?
A. Adrenal medulla hyperfunction
B. Primary adrenal insufficiency with cortisol and aldosterone deficiency
C. Secondary deficiency of ACTH from the pituitary
, D. Excessive production of mineralocorticoids
Correct Answer: B
Expert Explanation: Addison’s disease is a primary adrenal insufficiency where the
adrenal cortex is destroyed, often by autoimmune processes. This leads to a lack of
both glucocorticoids (cortisol) and mineralocorticoids (aldosterone). Patients
typically present with hypotension, hyperkalemia, and hyperpigmentation due to
compensatory increases in ACTH.
6. What is the primary cause of prerenal Acute Kidney Injury (AKI)?
A. Reduced blood flow to the kidneys
B. Nephrotoxic medication use
C. Obstruction of the urinary tract
D. Inflammation of the glomeruli
Correct Answer: A
Expert Explanation: Prerenal AKI occurs when there is a significant decrease in
renal perfusion without direct damage to the renal parenchyma. Common causes
include hypovolemia, heart failure, or severe hypotension. If the underlying cause is
corrected quickly, renal function usually returns to baseline without permanent
damage.
Version 3 | Questions with Correct Answers and
Expert Explanation for Each Question | Regis
1. Which of the following is the primary pathophysiologic mechanism of Type 1
Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Hypersecretion of glucagon by alpha cells
D. Decreased glucose absorption in the gut
Correct Answer: A
Expert Explanation: Type 1 Diabetes Mellitus is characterized by an absolute
insulin deficiency due to the destruction of insulin-producing beta cells in the
pancreas. This process is typically mediated by a T-cell-directed autoimmune attack
against various islet cell antigens. As a result, patients require exogenous insulin to
prevent ketoacidosis and sustain life.
2. A patient presents with serum sodium of 125 mEq/L, low serum osmolality, and
high urine osmolality. Which condition is most likely?
A. Diabetes Insipidus
B. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
,C. Addison’s Disease
D. Cushing’s Syndrome
Correct Answer: B
Expert Explanation: SIADH involves the excessive release of antidiuretic hormone,
which leads to water retention and dilutional hyponatremia. The high urine
osmolality indicates that the kidneys are inappropriately concentrating urine
despite a low serum osmolality. This electrolyte imbalance can lead to neurological
symptoms if the sodium levels drop too rapidly.
3. Which clinical manifestation is a hallmark of Graves’ disease?
A. Weight gain and bradycardia
B. Myxedema coma
C. Exophthalmos and heat intolerance
D. Hypocalcemia
Correct Answer: C
Expert Explanation: Graves’ disease is an autoimmune form of hyperthyroidism
caused by thyroid-stimulating immunoglobulins that bind to TSH receptors.
Exophthalmos, or bulging of the eyes, is a result of inflammation and tissue
,accumulation behind the eyeballs. Heat intolerance occurs because the elevated
thyroid hormone levels significantly increase the basal metabolic rate.
4. In Cushing’s syndrome, the physical finding of a ‘buffalo hump’ and ‘moon face’ is
caused by:
A. Excessive protein synthesis
B. Muscle hypertrophy in the face and neck
C. Severe water retention in the dermis
D. Redistribution of adipose tissue
Correct Answer: D
Expert Explanation: Cushing’s syndrome is characterized by chronic exposure to
excessive levels of cortisol. Cortisol promotes the redistribution of fat to the trunk,
face, and cervical spine area, leading to these classic physical signs. Additionally,
high cortisol levels stimulate gluconeogenesis, which often leads to hyperglycemia
and muscle wasting in the extremities.
5. Which of the following describes the pathophysiology of Addison’s disease?
A. Adrenal medulla hyperfunction
B. Primary adrenal insufficiency with cortisol and aldosterone deficiency
C. Secondary deficiency of ACTH from the pituitary
, D. Excessive production of mineralocorticoids
Correct Answer: B
Expert Explanation: Addison’s disease is a primary adrenal insufficiency where the
adrenal cortex is destroyed, often by autoimmune processes. This leads to a lack of
both glucocorticoids (cortisol) and mineralocorticoids (aldosterone). Patients
typically present with hypotension, hyperkalemia, and hyperpigmentation due to
compensatory increases in ACTH.
6. What is the primary cause of prerenal Acute Kidney Injury (AKI)?
A. Reduced blood flow to the kidneys
B. Nephrotoxic medication use
C. Obstruction of the urinary tract
D. Inflammation of the glomeruli
Correct Answer: A
Expert Explanation: Prerenal AKI occurs when there is a significant decrease in
renal perfusion without direct damage to the renal parenchyma. Common causes
include hypovolemia, heart failure, or severe hypotension. If the underlying cause is
corrected quickly, renal function usually returns to baseline without permanent
damage.
