NUR 2063 Exam 3: Essentials of Pathophysiology -
Rasmussen University Updated and Latest Questions and
Correct Answers with Rationale
1. A patient presents with polydipsia, polyuria, and an HbA1c of 8.5%. Which physiological mechanism
primarily contributes to the polyuria observed in this patient?
A. Decreased renal blood flow leading to compensatory fluid loss
B. Hypernatremia causing fluid shifts into the intracellular space
C. Increased antidiuretic hormone secretion by the posterior pituitary
D. Osmotic diuresis resulting from glycosuria
Correct Answer: D
Rationale: Diabetes mellitus leads to high blood glucose levels that exceed the renal threshold for
reabsorption. When glucose is excreted in the urine, it exerts an osmotic pull that carries water with it.
This process is known as osmotic diuresis and is the primary cause of polyuria in diabetic patients.
Understanding this mechanism helps clinicians manage fluid and electrolyte replacement strategies.
Failure to control hyperglycemia will result in persistent dehydration and potential metabolic crisis.
2. In the context of chronic kidney disease (CKD), why is a patient likely to develop secondary
hyperparathyroidism?
A. Excessive production of Vitamin D by the failing kidneys
B. Hypocalcemia due to phosphate retention and reduced Vitamin D activation
C. Hypophosphatemia triggering parathyroid gland activity
D. Direct stimulation of the parathyroid glands by erythropoietin deficiency
Correct Answer: B
,Rationale: Chronic kidney disease impairs the kidney’s ability to excrete phosphate and activate Vitamin
D. Increased phosphate levels bind to calcium, leading to hypocalcemia which stimulates the parathyroid
glands. The resulting secondary hyperparathyroidism is a compensatory attempt to restore serum
calcium levels. This condition often leads to renal osteodystrophy and significant bone mineral loss over
time. Effective management requires phosphate binders and active Vitamin D supplementation to
prevent bone complications.
3. A patient with cirrhosis develops hepatic encephalopathy. Which substance’s accumulation in the blood
is most directly responsible for the neurological changes?
A. Bilirubin
B. Albumin
C. Urea
D. Ammonia
Correct Answer: D
Rationale: In liver failure, the organ cannot effectively convert ammonia into urea for excretion. Elevated
serum ammonia levels cross the blood-brain barrier and interfere with neurotransmission and astrocyte
function. This neurotoxic environment manifests as confusion, lethargy, and the characteristic flapping
tremor known as asterixis. Treatment strategies often focus on reducing intestinal ammonia production
using lactulose. Monitoring neurological status is vital to assess the progression of liver-induced systemic
toxicity.
4. Which of the following describes the pathophysiology of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
,C. Excessive secretion of glucagon from alpha cells
D. Downregulation of insulin receptors due to obesity
Correct Answer: B
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency resulting from the
immune system attacking beta cells. This autoimmune response is typically triggered by genetic
susceptibility combined with environmental factors. Without beta cells, the body cannot produce the
insulin required to move glucose into cells for energy. This leads to hyperglycemia and the breakdown of
fats, potentially resulting in diabetic ketoacidosis. Lifelong exogenous insulin therapy is necessary for
survival in these patients.
5. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH). What laboratory
finding is most consistent with this diagnosis?
A. Uine specific gravity of 1.002
B. Serum osmolality of 310 mOsm/kg
C. Serum sodium of 125 mEq/L
D. Hypernatremia with polyuria
Correct Answer: C
Rationale: SIADH involves the excessive release of ADH, causing the kidneys to reabsorb too much
water. This fluid retention dilutes the serum, leading to dilutional hyponatremia and low serum
osmolality. A serum sodium level of 125 mEq/L is a classic indicator of this electrolyte imbalance. Unlike
diabetes insipidus, the urine in SIADH is highly concentrated due to the lack of water excretion.
Management typically focuses on fluid restriction and treating the underlying cause of hormone
dysregulation.
, 6. What is the primary cause of esophageal varices in patients with chronic liver disease?
A. Direct irritation from gastric acid reflux
B. Deficiency of clotting factors leading to spontaneous bleeding
C. Portal hypertension forcing blood into collateral circulation
D. Infection with the Hepatitis B virus
Correct Answer: C
Rationale: Cirrhosis causes structural changes in the liver that obstruct blood flow through the portal
vein. This resistance leads to portal hypertension, which redirects blood flow into smaller, fragile vessels
in the esophagus. These vessels become engorged and dilated, forming varices that are prone to rupture.
Bleeding varices represent a life-threatening emergency due to the potential for massive hemorrhage.
Prophylactic measures often include beta-blockers to reduce portal pressure and prevent initial bleeding
events.
7. A patient exhibits a moon face, buffalo hump, and truncal obesity. These clinical manifestations are
associated with an excess of which hormone?
A. Aldosterone
B. Growth Hormone
C. Thyroxine
D. Cortisol
Correct Answer: D
Rationale: Cushing’s syndrome results from chronic exposure to excessive levels of glucocorticoids,
primarily cortisol. Cortisol affects fat distribution, leading to the characteristic ‘moon face’ and ‘buffalo
hump’ seen in affected individuals. It also promotes protein breakdown, which results in thin extremities
Rasmussen University Updated and Latest Questions and
Correct Answers with Rationale
1. A patient presents with polydipsia, polyuria, and an HbA1c of 8.5%. Which physiological mechanism
primarily contributes to the polyuria observed in this patient?
A. Decreased renal blood flow leading to compensatory fluid loss
B. Hypernatremia causing fluid shifts into the intracellular space
C. Increased antidiuretic hormone secretion by the posterior pituitary
D. Osmotic diuresis resulting from glycosuria
Correct Answer: D
Rationale: Diabetes mellitus leads to high blood glucose levels that exceed the renal threshold for
reabsorption. When glucose is excreted in the urine, it exerts an osmotic pull that carries water with it.
This process is known as osmotic diuresis and is the primary cause of polyuria in diabetic patients.
Understanding this mechanism helps clinicians manage fluid and electrolyte replacement strategies.
Failure to control hyperglycemia will result in persistent dehydration and potential metabolic crisis.
2. In the context of chronic kidney disease (CKD), why is a patient likely to develop secondary
hyperparathyroidism?
A. Excessive production of Vitamin D by the failing kidneys
B. Hypocalcemia due to phosphate retention and reduced Vitamin D activation
C. Hypophosphatemia triggering parathyroid gland activity
D. Direct stimulation of the parathyroid glands by erythropoietin deficiency
Correct Answer: B
,Rationale: Chronic kidney disease impairs the kidney’s ability to excrete phosphate and activate Vitamin
D. Increased phosphate levels bind to calcium, leading to hypocalcemia which stimulates the parathyroid
glands. The resulting secondary hyperparathyroidism is a compensatory attempt to restore serum
calcium levels. This condition often leads to renal osteodystrophy and significant bone mineral loss over
time. Effective management requires phosphate binders and active Vitamin D supplementation to
prevent bone complications.
3. A patient with cirrhosis develops hepatic encephalopathy. Which substance’s accumulation in the blood
is most directly responsible for the neurological changes?
A. Bilirubin
B. Albumin
C. Urea
D. Ammonia
Correct Answer: D
Rationale: In liver failure, the organ cannot effectively convert ammonia into urea for excretion. Elevated
serum ammonia levels cross the blood-brain barrier and interfere with neurotransmission and astrocyte
function. This neurotoxic environment manifests as confusion, lethargy, and the characteristic flapping
tremor known as asterixis. Treatment strategies often focus on reducing intestinal ammonia production
using lactulose. Monitoring neurological status is vital to assess the progression of liver-induced systemic
toxicity.
4. Which of the following describes the pathophysiology of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
,C. Excessive secretion of glucagon from alpha cells
D. Downregulation of insulin receptors due to obesity
Correct Answer: B
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency resulting from the
immune system attacking beta cells. This autoimmune response is typically triggered by genetic
susceptibility combined with environmental factors. Without beta cells, the body cannot produce the
insulin required to move glucose into cells for energy. This leads to hyperglycemia and the breakdown of
fats, potentially resulting in diabetic ketoacidosis. Lifelong exogenous insulin therapy is necessary for
survival in these patients.
5. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH). What laboratory
finding is most consistent with this diagnosis?
A. Uine specific gravity of 1.002
B. Serum osmolality of 310 mOsm/kg
C. Serum sodium of 125 mEq/L
D. Hypernatremia with polyuria
Correct Answer: C
Rationale: SIADH involves the excessive release of ADH, causing the kidneys to reabsorb too much
water. This fluid retention dilutes the serum, leading to dilutional hyponatremia and low serum
osmolality. A serum sodium level of 125 mEq/L is a classic indicator of this electrolyte imbalance. Unlike
diabetes insipidus, the urine in SIADH is highly concentrated due to the lack of water excretion.
Management typically focuses on fluid restriction and treating the underlying cause of hormone
dysregulation.
, 6. What is the primary cause of esophageal varices in patients with chronic liver disease?
A. Direct irritation from gastric acid reflux
B. Deficiency of clotting factors leading to spontaneous bleeding
C. Portal hypertension forcing blood into collateral circulation
D. Infection with the Hepatitis B virus
Correct Answer: C
Rationale: Cirrhosis causes structural changes in the liver that obstruct blood flow through the portal
vein. This resistance leads to portal hypertension, which redirects blood flow into smaller, fragile vessels
in the esophagus. These vessels become engorged and dilated, forming varices that are prone to rupture.
Bleeding varices represent a life-threatening emergency due to the potential for massive hemorrhage.
Prophylactic measures often include beta-blockers to reduce portal pressure and prevent initial bleeding
events.
7. A patient exhibits a moon face, buffalo hump, and truncal obesity. These clinical manifestations are
associated with an excess of which hormone?
A. Aldosterone
B. Growth Hormone
C. Thyroxine
D. Cortisol
Correct Answer: D
Rationale: Cushing’s syndrome results from chronic exposure to excessive levels of glucocorticoids,
primarily cortisol. Cortisol affects fat distribution, leading to the characteristic ‘moon face’ and ‘buffalo
hump’ seen in affected individuals. It also promotes protein breakdown, which results in thin extremities
