NURS 370 | PATH370 Exam 3: Pathophysiology -
WCU Updated and Latest Questions and Correct
Answers with Rationale
1. A patient presents with extreme thirst and a high volume of very dilute urine. The nurse
suspects Diabetes Insipidus. Which hormonal deficiency is responsible for this condition?
A. Aldosterone
B. Cortisol
C. Antidiuretic Hormone (ADH)
D. Oxytocin
Correct Answer: C
Rationale: Diabetes Insipidus is primarily caused by a deficiency of Antidiuretic Hormone
(ADH) or a lack of response to it. This hormone is crucial for water reabsorption in the
distal tubules and collecting ducts of the kidney. Without sufficient ADH, the kidneys
cannot concentrate urine, leading to massive water loss. Clinical manifestations include
polyuria and compensatory polydipsia. This electrolyte and fluid imbalance can quickly
lead to severe dehydration if not managed properly.
2. In Type 1 Diabetes Mellitus, what is the primary pathophysiological mechanism leading to
hyperglycemia?
A. Autoimmune destruction of pancreatic beta cells
B. Excessive glucagon production by alpha cells
C. Insulin resistance in peripheral tissues
D. Decreased glucose absorption in the gut
Correct Answer: A
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency due
to the destruction of pancreatic beta cells. This is typically an autoimmune process where
the body’s immune system attacks its own insulin-producing cells. Without insulin, glucose
cannot enter cells for energy, remaining in the bloodstream instead. This leads to the
hallmark signs of hyperglycemia, glucosuria, and polyuria. Long-term management
requires exogenous insulin to maintain metabolic stability.
3. A patient with Gastroesophageal Reflux Disease (GERD) complains of frequent heartburn.
What is the most common cause of this condition?
A. Increased gastric acid secretion
B. Rapid gastric emptying
,C. Incompetent lower esophageal sphincter (LES)
D. Overproduction of protective mucus
Correct Answer: C
Rationale: GERD occurs when the lower esophageal sphincter (LES) fails to remain closed,
allowing stomach contents to reflux into the esophagus. The esophageal mucosa is not
designed to withstand the acidity of gastric juice, leading to irritation and inflammation.
Common triggers for LES relaxation include certain foods, caffeine, and obesity. Over time,
this chronic exposure can cause Barrett’s esophagus or esophageal strictures. Management
often focuses on lifestyle changes and medications that reduce acid production.
4. Which of the following describes a prerenal cause of Acute Kidney Injury (AKI)?
A. Polycystic kidney disease
B. Obstruction of the ureters by stones
C. Severe hemorrhage leading to hypotension
D. Toxic injury from aminoglycoside antibiotics
Correct Answer: C
Rationale: Prerenal AKI is caused by conditions that reduce blood flow to the kidneys
without directly damaging the renal tissue. Severe hemorrhage leads to systemic
hypotension, which decreases the renal perfusion pressure and glomerular filtration rate.
Because the kidney’s structural integrity remains intact initially, this condition is often
reversible if blood flow is restored. Other causes include dehydration, heart failure, and
shock. If left untreated, prolonged ischemia can transition into intrarenal damage.
5. A patient is diagnosed with Graves’ disease. Which clinical finding is most consistent with
the pathophysiology of hyperthyroidism?
A. Bradycardia
B. Exophthalmos
C. Weight gain
D. Cold intolerance
Correct Answer: B
Rationale: Graves’ disease is an autoimmune disorder where antibodies stimulate the
thyroid gland to overproduce thyroid hormone. Exophthalmos, or bulging of the eyes, is a
specific manifestation caused by autoimmune-mediated inflammation of the extraocular
muscles and fat. High levels of thyroid hormone increase the basal metabolic rate, leading
to symptoms like tachycardia and heat intolerance. Weight loss occurs despite increased
appetite because the body is in a hypermetabolic state. Treatment aims to reduce thyroid
hormone levels through medication or surgery.
, 6. Cushing’s syndrome is characterized by an excess of which hormone?
A. Insulin
B. Growth hormone
C. Cortisol
D. Epinephrine
Correct Answer: C
Rationale: Cushing’s syndrome results from chronic exposure to excessive levels of
glucocorticoids, primarily cortisol. This can be caused by adrenal tumors, pituitary tumors
(Cushing’s disease), or long-term use of corticosteroid medications. Excess cortisol affects
nearly every body system, promoting fat redistribution to the face and trunk. It also leads
to muscle wasting, thin skin, and impaired immune function. Diagnosing this condition
involves testing for elevated cortisol levels in the blood, urine, or saliva.
7. What is the primary role of Helicobacter pylori in the development of Peptic Ulcer Disease?
A. It increases the production of stomach acid
B. It prevents the secretion of bicarbonate
C. It causes direct mechanical trauma to the stomach wall
D. It breaks down the protective mucosal barrier
Correct Answer: D
Rationale: Helicobacter pylori is a gram-negative bacterium that colonizes the gastric
mucosa and is a leading cause of peptic ulcers. It secretes enzymes like urease that
neutralize stomach acid locally, allowing it to survive. More importantly, it produces toxins
that trigger an inflammatory response, damaging the protective mucus lining. This damage
allows gastric acid and pepsin to reach the sensitive underlying tissue, causing ulceration.
Eradicating the bacteria with antibiotics is essential for curing the ulcer and preventing
recurrence.
8. In Chronic Kidney Disease (CKD), which electrolyte imbalance is most commonly associated
with decreased renal excretion?
A. Hypokalemia
B. Hyponatremia
C. Hyperkalemia
D. Hypophosphatemia
Correct Answer: C
Rationale: As renal function declines in CKD, the kidneys lose their ability to excrete
potassium effectively. Hyperkalemia is a dangerous complication because elevated
WCU Updated and Latest Questions and Correct
Answers with Rationale
1. A patient presents with extreme thirst and a high volume of very dilute urine. The nurse
suspects Diabetes Insipidus. Which hormonal deficiency is responsible for this condition?
A. Aldosterone
B. Cortisol
C. Antidiuretic Hormone (ADH)
D. Oxytocin
Correct Answer: C
Rationale: Diabetes Insipidus is primarily caused by a deficiency of Antidiuretic Hormone
(ADH) or a lack of response to it. This hormone is crucial for water reabsorption in the
distal tubules and collecting ducts of the kidney. Without sufficient ADH, the kidneys
cannot concentrate urine, leading to massive water loss. Clinical manifestations include
polyuria and compensatory polydipsia. This electrolyte and fluid imbalance can quickly
lead to severe dehydration if not managed properly.
2. In Type 1 Diabetes Mellitus, what is the primary pathophysiological mechanism leading to
hyperglycemia?
A. Autoimmune destruction of pancreatic beta cells
B. Excessive glucagon production by alpha cells
C. Insulin resistance in peripheral tissues
D. Decreased glucose absorption in the gut
Correct Answer: A
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency due
to the destruction of pancreatic beta cells. This is typically an autoimmune process where
the body’s immune system attacks its own insulin-producing cells. Without insulin, glucose
cannot enter cells for energy, remaining in the bloodstream instead. This leads to the
hallmark signs of hyperglycemia, glucosuria, and polyuria. Long-term management
requires exogenous insulin to maintain metabolic stability.
3. A patient with Gastroesophageal Reflux Disease (GERD) complains of frequent heartburn.
What is the most common cause of this condition?
A. Increased gastric acid secretion
B. Rapid gastric emptying
,C. Incompetent lower esophageal sphincter (LES)
D. Overproduction of protective mucus
Correct Answer: C
Rationale: GERD occurs when the lower esophageal sphincter (LES) fails to remain closed,
allowing stomach contents to reflux into the esophagus. The esophageal mucosa is not
designed to withstand the acidity of gastric juice, leading to irritation and inflammation.
Common triggers for LES relaxation include certain foods, caffeine, and obesity. Over time,
this chronic exposure can cause Barrett’s esophagus or esophageal strictures. Management
often focuses on lifestyle changes and medications that reduce acid production.
4. Which of the following describes a prerenal cause of Acute Kidney Injury (AKI)?
A. Polycystic kidney disease
B. Obstruction of the ureters by stones
C. Severe hemorrhage leading to hypotension
D. Toxic injury from aminoglycoside antibiotics
Correct Answer: C
Rationale: Prerenal AKI is caused by conditions that reduce blood flow to the kidneys
without directly damaging the renal tissue. Severe hemorrhage leads to systemic
hypotension, which decreases the renal perfusion pressure and glomerular filtration rate.
Because the kidney’s structural integrity remains intact initially, this condition is often
reversible if blood flow is restored. Other causes include dehydration, heart failure, and
shock. If left untreated, prolonged ischemia can transition into intrarenal damage.
5. A patient is diagnosed with Graves’ disease. Which clinical finding is most consistent with
the pathophysiology of hyperthyroidism?
A. Bradycardia
B. Exophthalmos
C. Weight gain
D. Cold intolerance
Correct Answer: B
Rationale: Graves’ disease is an autoimmune disorder where antibodies stimulate the
thyroid gland to overproduce thyroid hormone. Exophthalmos, or bulging of the eyes, is a
specific manifestation caused by autoimmune-mediated inflammation of the extraocular
muscles and fat. High levels of thyroid hormone increase the basal metabolic rate, leading
to symptoms like tachycardia and heat intolerance. Weight loss occurs despite increased
appetite because the body is in a hypermetabolic state. Treatment aims to reduce thyroid
hormone levels through medication or surgery.
, 6. Cushing’s syndrome is characterized by an excess of which hormone?
A. Insulin
B. Growth hormone
C. Cortisol
D. Epinephrine
Correct Answer: C
Rationale: Cushing’s syndrome results from chronic exposure to excessive levels of
glucocorticoids, primarily cortisol. This can be caused by adrenal tumors, pituitary tumors
(Cushing’s disease), or long-term use of corticosteroid medications. Excess cortisol affects
nearly every body system, promoting fat redistribution to the face and trunk. It also leads
to muscle wasting, thin skin, and impaired immune function. Diagnosing this condition
involves testing for elevated cortisol levels in the blood, urine, or saliva.
7. What is the primary role of Helicobacter pylori in the development of Peptic Ulcer Disease?
A. It increases the production of stomach acid
B. It prevents the secretion of bicarbonate
C. It causes direct mechanical trauma to the stomach wall
D. It breaks down the protective mucosal barrier
Correct Answer: D
Rationale: Helicobacter pylori is a gram-negative bacterium that colonizes the gastric
mucosa and is a leading cause of peptic ulcers. It secretes enzymes like urease that
neutralize stomach acid locally, allowing it to survive. More importantly, it produces toxins
that trigger an inflammatory response, damaging the protective mucus lining. This damage
allows gastric acid and pepsin to reach the sensitive underlying tissue, causing ulceration.
Eradicating the bacteria with antibiotics is essential for curing the ulcer and preventing
recurrence.
8. In Chronic Kidney Disease (CKD), which electrolyte imbalance is most commonly associated
with decreased renal excretion?
A. Hypokalemia
B. Hyponatremia
C. Hyperkalemia
D. Hypophosphatemia
Correct Answer: C
Rationale: As renal function declines in CKD, the kidneys lose their ability to excrete
potassium effectively. Hyperkalemia is a dangerous complication because elevated
