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NU664 Exam 1 Study Guide Actual Exam
2026/2027 – Complete Exam-Style Questions
with Detailed Rationales | 100% Verified –
Pass Guaranteed – A+ Graded
Advanced Pathophysiology – Mechanisms of Disease & System-Based Disorders
Q1: When a cell is subjected to mild, reversible injury, it often undergoes cellular adaptation.
Which of the following describes a decrease in cell size and function due to a reduction in
workload or stimulation?
A. Hypertrophy
B. Hyperplasia
C. Atrophy
D. Metaplasia
Correct Answer: C
Rationale: Atrophy is the specific term for the shrinkage of cell size and a decrease in function,
which occurs when there is reduced workload, lack of hormonal stimulation, or diminished
nutrient supply.
Q2: In the context of the inflammatory response, which cellular mediator is primarily responsible
for causing vasodilation and increased vascular permeability during the acute phase?
A. Bradykinin
B. Histamine
C. Prostaglandins
D. Leukotrienes
Correct Answer: B
Rationale: Histamine, released by mast cells and basophils, is the key mediator that rapidly
causes blood vessels to dilate and become leaky, allowing plasma proteins and leukocytes to
enter the injured tissue.
,2
Q3: A patient presents with confusion, muscle twitching, and an electrocardiogram showing
peaked T waves. Which electrolyte imbalance is the most likely cause of these findings?
A. Hyponatremia
B. Hypokalemia
C. Hyperkalemia
D. Hypocalcemia
Correct Answer: C
Rationale: These are classic signs of severe hyperkalemia; the high potassium concentration
affects cardiac repolarization (peaked T waves) and neuromuscular irritability (muscle
twitching).
Q4: [Unfolding Mini-Case Part 1] Mr. J, a 58-year-old male, presents with dyspnea on exertion
and swelling in his ankles. On assessment, you note jugular venous distension and crackles in the
lung bases. Which Starling force is primarily responsible for the pulmonary edema seen in this
patient's heart failure?
A. Decreased hydrostatic pressure in capillaries
B. Increased hydrostatic pressure in capillaries
C. Increased oncotic pressure in interstitium
D. Decreased oncotic pressure in capillaries
Correct Answer: B
Rationale: In heart failure, the failing heart cannot pump blood forward efficiently, causing blood
to back up into the pulmonary circulation, which increases capillary hydrostatic pressure and
forces fluid out into the alveoli.
Q5: [Unfolding Mini-Case Part 2] Mr. J's labs reveal low sodium. His doctor explains this is
likely due to his heart failure causing water retention more than sodium retention. Which
hormonal system is inappropriately activated in heart failure, leading to this dilutional
hyponatremia?
A. Parathyroid hormone
B. Renin-angiotensin-aldosterone system (RAAS)
C. Thyroid hormone
, 3
D. Growth hormone
Correct Answer: B
Rationale: The RAAS is activated in response to low cardiac output; while it retains sodium, the
severe water retention mediated by ADH and RAAS often overwhelms the sodium retention,
leading to dilutional hyponatremia.
Q6: [Unfolding Mini-Case Part 3] To manage Mr. J's heart failure, a beta-blocker is prescribed.
From a pathophysiological standpoint, how do beta-blockers improve the myocardial oxygen
demand-supply balance?
A. They increase heart rate to improve cardiac output.
B. They block the effects of norepinephrine, reducing heart rate and contractility.
C. They cause direct vasodilation to lower afterload.
D. They increase the force of contraction to pump more blood.
Correct Answer: B
Rationale: Beta-blockers inhibit the sympathetic nervous system by blocking catecholamines,
which slows the heart rate and reduces the force of contraction, thereby lowering the heart's
oxygen demand and preventing remodeling.
Q7: A patient with long-standing, uncontrolled hypertension presents with a "thump" when
palpating the abdomen and a new abdominal bruit. You suspect an abdominal aortic aneurysm
(AAA). Which pathophysiologic mechanism is the primary cause of this condition?
A. Vasculitis causing inflammation of the vessel wall
B. Cystic medial necrosis of the aorta
C. Weakening of the vessel wall due to turbulent flow and shear stress
D. Congenital anomaly of the connective tissue
Correct Answer: C
Rationale: While cystic medial necrosis is a factor, the primary driver of AAAs in hypertensive
patients is the mechanical stress and shear force on the arterial wall, leading to degradation of the
elastin and collagen.
NU664 Exam 1 Study Guide Actual Exam
2026/2027 – Complete Exam-Style Questions
with Detailed Rationales | 100% Verified –
Pass Guaranteed – A+ Graded
Advanced Pathophysiology – Mechanisms of Disease & System-Based Disorders
Q1: When a cell is subjected to mild, reversible injury, it often undergoes cellular adaptation.
Which of the following describes a decrease in cell size and function due to a reduction in
workload or stimulation?
A. Hypertrophy
B. Hyperplasia
C. Atrophy
D. Metaplasia
Correct Answer: C
Rationale: Atrophy is the specific term for the shrinkage of cell size and a decrease in function,
which occurs when there is reduced workload, lack of hormonal stimulation, or diminished
nutrient supply.
Q2: In the context of the inflammatory response, which cellular mediator is primarily responsible
for causing vasodilation and increased vascular permeability during the acute phase?
A. Bradykinin
B. Histamine
C. Prostaglandins
D. Leukotrienes
Correct Answer: B
Rationale: Histamine, released by mast cells and basophils, is the key mediator that rapidly
causes blood vessels to dilate and become leaky, allowing plasma proteins and leukocytes to
enter the injured tissue.
,2
Q3: A patient presents with confusion, muscle twitching, and an electrocardiogram showing
peaked T waves. Which electrolyte imbalance is the most likely cause of these findings?
A. Hyponatremia
B. Hypokalemia
C. Hyperkalemia
D. Hypocalcemia
Correct Answer: C
Rationale: These are classic signs of severe hyperkalemia; the high potassium concentration
affects cardiac repolarization (peaked T waves) and neuromuscular irritability (muscle
twitching).
Q4: [Unfolding Mini-Case Part 1] Mr. J, a 58-year-old male, presents with dyspnea on exertion
and swelling in his ankles. On assessment, you note jugular venous distension and crackles in the
lung bases. Which Starling force is primarily responsible for the pulmonary edema seen in this
patient's heart failure?
A. Decreased hydrostatic pressure in capillaries
B. Increased hydrostatic pressure in capillaries
C. Increased oncotic pressure in interstitium
D. Decreased oncotic pressure in capillaries
Correct Answer: B
Rationale: In heart failure, the failing heart cannot pump blood forward efficiently, causing blood
to back up into the pulmonary circulation, which increases capillary hydrostatic pressure and
forces fluid out into the alveoli.
Q5: [Unfolding Mini-Case Part 2] Mr. J's labs reveal low sodium. His doctor explains this is
likely due to his heart failure causing water retention more than sodium retention. Which
hormonal system is inappropriately activated in heart failure, leading to this dilutional
hyponatremia?
A. Parathyroid hormone
B. Renin-angiotensin-aldosterone system (RAAS)
C. Thyroid hormone
, 3
D. Growth hormone
Correct Answer: B
Rationale: The RAAS is activated in response to low cardiac output; while it retains sodium, the
severe water retention mediated by ADH and RAAS often overwhelms the sodium retention,
leading to dilutional hyponatremia.
Q6: [Unfolding Mini-Case Part 3] To manage Mr. J's heart failure, a beta-blocker is prescribed.
From a pathophysiological standpoint, how do beta-blockers improve the myocardial oxygen
demand-supply balance?
A. They increase heart rate to improve cardiac output.
B. They block the effects of norepinephrine, reducing heart rate and contractility.
C. They cause direct vasodilation to lower afterload.
D. They increase the force of contraction to pump more blood.
Correct Answer: B
Rationale: Beta-blockers inhibit the sympathetic nervous system by blocking catecholamines,
which slows the heart rate and reduces the force of contraction, thereby lowering the heart's
oxygen demand and preventing remodeling.
Q7: A patient with long-standing, uncontrolled hypertension presents with a "thump" when
palpating the abdomen and a new abdominal bruit. You suspect an abdominal aortic aneurysm
(AAA). Which pathophysiologic mechanism is the primary cause of this condition?
A. Vasculitis causing inflammation of the vessel wall
B. Cystic medial necrosis of the aorta
C. Weakening of the vessel wall due to turbulent flow and shear stress
D. Congenital anomaly of the connective tissue
Correct Answer: C
Rationale: While cystic medial necrosis is a factor, the primary driver of AAAs in hypertensive
patients is the mechanical stress and shear force on the arterial wall, leading to degradation of the
elastin and collagen.
