NR 507 Exam 3: Advanced Pathophysiology V3 Updated
and Latest Questions and Correct Answers with Rationale
1. Which electrolyte imbalance is a hallmark feature of the Syndrome of Inappropriate
Antidiuretic Hormone (SIADH)?
A. Hypernatremia
B. Hypokalemia
C. Hyponatremia
D. Hypercalcemia
Ans: C
Rationale: SIADH involves the excessive release of antidiuretic hormone which promotes significant
water reabsorption in the kidneys. This extra water expands the extracellular fluid volume and leads to a
dilutional effect on sodium. Consequently, serum sodium levels drop below the normal range resulting in
hyponatremia. Patients may experience neurological symptoms as water shifts into brain cells causing
edema. The condition is often associated with small cell lung cancer or traumatic brain injuries.
Treatment involves fluid restriction to normalize the sodium concentration in the blood.
,2. In Type 1 Diabetes Mellitus, the primary underlying mechanism is:
A. Insulin resistance in peripheral tissues
B. Excessive glucagon production from alpha cells
C. Autoimmune destruction of pancreatic beta cells
D. Decreased glucose absorption in the gut
Ans: C
Rationale: Type 1 diabetes is characterized by an absolute insulin deficiency due to the loss of beta cells.
This destruction is typically mediated by an autoimmune response involving T-cells and various
autoantibodies. Without insulin, glucose cannot enter cells for energy, leading to hyperglycemia and
metabolic distress. The body compensates by breaking down fats, which often leads to the development
of ketoacidosis. Genetic susceptibility and environmental triggers are considered the primary drivers of
this immune dysfunction. Clinical presentation usually occurs abruptly in children or young adults with
classic symptoms of polyuria and polydipsia.
3. Which clinical manifestation is most characteristic of Cushing Syndrome?
A. Hyperpigmentation and weight loss
B. Cold intolerance and bradycardia
C. Postural hypotension and tachycardia
D. Central obesity and a ‘buffalo hump’
Ans: D
,Rationale: Cushing syndrome results from chronic exposure to excessive levels of cortisol in the body.
Cortisol promotes lipogenesis in the trunk while causing muscle wasting in the extremities. This leads to
the classic physical appearance of a rounded ‘moon face’ and a fat pad on the upper back. High cortisol
levels also interfere with collagen synthesis, resulting in thin skin and purple striae. Bone density often
decreases because cortisol inhibits osteoblast activity and calcium absorption. Metabolic consequences
include glucose intolerance and potential development of secondary diabetes mellitus.
4. The most common cause of hypothyroidism worldwide is:
A. Pituitary adenoma
B. Hashimoto thyroiditis
C. Iodine deficiency
D. Graves disease
Ans: C
Rationale: Hypothyroidism occurs when the thyroid gland fails to produce sufficient levels of T3 and T4
hormones. Globally, the lack of dietary iodine remains the most prevalent cause of this condition. In
regions with adequate iodine, Hashimoto thyroiditis, an autoimmune disorder, becomes the leading
cause. Symptoms typically include fatigue, weight gain, and cold intolerance due to a lowered metabolic
rate. Elevated levels of Thyroid Stimulating Hormone are usually found as the pituitary tries to
compensate. Long-term untreated hypothyroidism can lead to severe complications like myxedema
coma.
, 5. Which hormone is responsible for stimulating the contraction of the gallbladder and the
release of pancreatic enzymes?
A. Gastrin
B. Secretin
C. Cholecystokinin (CCK)
D. Somatostatin
Ans: C
Rationale: Cholecystokinin is a peptide hormone produced by the I-cells in the duodenum and jejunum.
It is released in response to the presence of fats and proteins in the small intestine. CCK triggers the
gallbladder to contract, which moves bile into the common bile duct. Simultaneously, it stimulates the
pancreas to secrete digestive enzymes into the duodenum. This hormone also plays a role in slowing
gastric emptying to ensure efficient digestion. Understanding CCK is vital for diagnosing disorders like
biliary dyskinesia or chronic pancreatitis.
6. Gastroesophageal reflux disease (GERD) is primarily caused by:
A. Excessive production of hydrochloric acid
B. Incompetence of the lower esophageal sphincter
C. Rapid gastric emptying into the duodenum
D. Infection with Helicobacter pylori
Ans: B
and Latest Questions and Correct Answers with Rationale
1. Which electrolyte imbalance is a hallmark feature of the Syndrome of Inappropriate
Antidiuretic Hormone (SIADH)?
A. Hypernatremia
B. Hypokalemia
C. Hyponatremia
D. Hypercalcemia
Ans: C
Rationale: SIADH involves the excessive release of antidiuretic hormone which promotes significant
water reabsorption in the kidneys. This extra water expands the extracellular fluid volume and leads to a
dilutional effect on sodium. Consequently, serum sodium levels drop below the normal range resulting in
hyponatremia. Patients may experience neurological symptoms as water shifts into brain cells causing
edema. The condition is often associated with small cell lung cancer or traumatic brain injuries.
Treatment involves fluid restriction to normalize the sodium concentration in the blood.
,2. In Type 1 Diabetes Mellitus, the primary underlying mechanism is:
A. Insulin resistance in peripheral tissues
B. Excessive glucagon production from alpha cells
C. Autoimmune destruction of pancreatic beta cells
D. Decreased glucose absorption in the gut
Ans: C
Rationale: Type 1 diabetes is characterized by an absolute insulin deficiency due to the loss of beta cells.
This destruction is typically mediated by an autoimmune response involving T-cells and various
autoantibodies. Without insulin, glucose cannot enter cells for energy, leading to hyperglycemia and
metabolic distress. The body compensates by breaking down fats, which often leads to the development
of ketoacidosis. Genetic susceptibility and environmental triggers are considered the primary drivers of
this immune dysfunction. Clinical presentation usually occurs abruptly in children or young adults with
classic symptoms of polyuria and polydipsia.
3. Which clinical manifestation is most characteristic of Cushing Syndrome?
A. Hyperpigmentation and weight loss
B. Cold intolerance and bradycardia
C. Postural hypotension and tachycardia
D. Central obesity and a ‘buffalo hump’
Ans: D
,Rationale: Cushing syndrome results from chronic exposure to excessive levels of cortisol in the body.
Cortisol promotes lipogenesis in the trunk while causing muscle wasting in the extremities. This leads to
the classic physical appearance of a rounded ‘moon face’ and a fat pad on the upper back. High cortisol
levels also interfere with collagen synthesis, resulting in thin skin and purple striae. Bone density often
decreases because cortisol inhibits osteoblast activity and calcium absorption. Metabolic consequences
include glucose intolerance and potential development of secondary diabetes mellitus.
4. The most common cause of hypothyroidism worldwide is:
A. Pituitary adenoma
B. Hashimoto thyroiditis
C. Iodine deficiency
D. Graves disease
Ans: C
Rationale: Hypothyroidism occurs when the thyroid gland fails to produce sufficient levels of T3 and T4
hormones. Globally, the lack of dietary iodine remains the most prevalent cause of this condition. In
regions with adequate iodine, Hashimoto thyroiditis, an autoimmune disorder, becomes the leading
cause. Symptoms typically include fatigue, weight gain, and cold intolerance due to a lowered metabolic
rate. Elevated levels of Thyroid Stimulating Hormone are usually found as the pituitary tries to
compensate. Long-term untreated hypothyroidism can lead to severe complications like myxedema
coma.
, 5. Which hormone is responsible for stimulating the contraction of the gallbladder and the
release of pancreatic enzymes?
A. Gastrin
B. Secretin
C. Cholecystokinin (CCK)
D. Somatostatin
Ans: C
Rationale: Cholecystokinin is a peptide hormone produced by the I-cells in the duodenum and jejunum.
It is released in response to the presence of fats and proteins in the small intestine. CCK triggers the
gallbladder to contract, which moves bile into the common bile duct. Simultaneously, it stimulates the
pancreas to secrete digestive enzymes into the duodenum. This hormone also plays a role in slowing
gastric emptying to ensure efficient digestion. Understanding CCK is vital for diagnosing disorders like
biliary dyskinesia or chronic pancreatitis.
6. Gastroesophageal reflux disease (GERD) is primarily caused by:
A. Excessive production of hydrochloric acid
B. Incompetence of the lower esophageal sphincter
C. Rapid gastric emptying into the duodenum
D. Infection with Helicobacter pylori
Ans: B
