MSN 570 Advanced Pathophysiology
Final Actual Exam 2026/2027 | United
States University | 70 Questions with
Verified ,,,,answer,,,s and Rationales |
Pass Guaranteed - A+ Graded
Question 1
A patient has a genetic mutation that results in a nonfunctional protein critical for DNA
repair. Which cellular process is most directly impaired?
A. Apoptosis
B. Cell cycle checkpoint control
C. Oxidative phosphorylation
D. Protein synthesis
Correct ,,,,answer,,,: B
Rationale: DNA repair proteins are essential for maintaining genomic integrity during
the cell cycle. Without them, cell cycle checkpoints (especially G1/S and G2/M) fail,
allowing mutations to accumulate. Apoptosis (A) may be triggered secondarily, but it is
not the primary impaired process. Oxidative phosphorylation (C) involves mitochondria.
Protein synthesis (D) involves ribosomes and translation machinery.
,Question 2
In a patient with chronic heart failure, which compensatory mechanism eventually
becomes maladaptive and accelerates disease progression?
A. Increased preload via Frank-Starling mechanism
B. Activation of the renin-angiotensin-aldosterone system (RAAS)
C. Increased heart rate via sympathetic stimulation
D. All of the above
Correct ,,,,answer,,,: D
Rationale: All three mechanisms initially compensate for reduced cardiac output but
later cause harm: increased preload leads to pulmonary/systemic congestion; RAAS
causes sodium/water retention and fibrosis; chronic sympathetic activation increases
myocardial oxygen demand and arrhythmia risk.
Question 3
Which finding is characteristic of type I hypersensitivity?
A. Immune complex deposition in glomeruli
B. CD8+ T-cell mediated destruction of pancreatic beta cells
C. Mast cell degranulation triggered by cross-linking of IgE
D. Antibody-mediated hemolysis in a transfusion reaction
Correct ,,,,answer,,,: C
Rationale: Type I hypersensitivity (immediate) involves IgE binding to mast
cells/basophils, with cross-linking by allergen triggering degranulation (histamine,
leukotrienes). (A) is type III, (B) is type IV (cell-mediated), (D) is type II (antibody-
dependent cytotoxicity).
,Question 4
A patient with diabetic ketoacidosis has an arterial blood gas: pH 7.25, PaCO2 30 mmHg,
HCO3- 12 mEq/L. What is the primary acid-base disorder and compensation?
A. Metabolic acidosis with appropriate respiratory compensation (acute)
B. Metabolic acidosis with appropriate respiratory compensation (chronic)
C. Respiratory acidosis with metabolic compensation
D. Mixed metabolic acidosis and respiratory alkalosis
Correct ,,,,answer,,,: B
Rationale: Low pH, low HCO3- → metabolic acidosis. Expected PaCO2 = 1.5 × HCO3- +
8 ± 2 = 1.5×12+8 = 26 (range 24–28). Patient’s PaCO2 is 30, slightly above, but still
within chronic compensatory range (metabolic acidosis → hyperventilation; chronic
because DKA develops over hours, not minutes). (A) uses acute formula (PaCO2 =
HCO3- + 15) which gives 27; 30 is slightly higher but acceptable. Best ,,,,answer,,, is
chronic compensation.
Question 5
A 45-year-old woman presents with fatigue, pallor, and paresthesias in her hands. Lab:
hemoglobin 9 g/dL, mean corpuscular volume (MCV) 110 fL, low vitamin B12. Which
pathophysiologic process explains the neurologic symptoms?
A. Demyelination of dorsal columns and corticospinal tracts
B. Axonal degeneration of peripheral motor neurons
C. Impaired synthesis of heme in erythroid precursors
D. Autoimmune destruction of gastric parietal cells
Correct ,,,,answer,,,: A
Rationale: Vitamin B12 deficiency causes subacute combined degeneration of spinal
cord – demyelination of dorsal columns (loss of vibration/proprioception) and
, corticospinal tracts (weakness). (B) is not typical. (C) describes iron deficiency. (D) is
cause (pernicious anemia) but not the mechanism of neurologic symptoms.
Question 6
Which statement best describes necroptosis?
A. A form of programmed necrosis requiring receptor-interacting protein kinases
(RIPK1/RIPK3)
B. Caspase-dependent apoptosis triggered by mitochondrial cytochrome c release
C. Unprogrammed cell death due to severe ATP depletion
D. Autophagic cell death characterized by lysosomal degradation
Correct ,,,,answer,,,: A
Rationale: Necroptosis is a regulated form of necrosis, activated when caspases are
inhibited, and requires RIPK1/RIPK3 and MLKL. (B) describes intrinsic apoptosis, (C)
describes oncotic necrosis, (D) describes autophagic cell death.
Question 7
A patient with cirrhosis develops ascites. Which hemodynamic abnormality is the
primary driver of sodium and water retention in this setting?
A. Increased hydrostatic pressure in splanchnic capillaries
B. Decreased plasma colloid osmotic pressure due to hypoalbuminemia
C. Splanchnic arterial vasodilation leading to effective arterial blood volume depletion
D. Increased hepatic lymph formation exceeding lymphatic drainage
Correct ,,,,answer,,,: C
Rationale: In cirrhosis, splanchnic vasodilation reduces effective arterial blood volume,
activating RAAS and sympathetic nerves, causing renal sodium/water retention. (A) and
Final Actual Exam 2026/2027 | United
States University | 70 Questions with
Verified ,,,,answer,,,s and Rationales |
Pass Guaranteed - A+ Graded
Question 1
A patient has a genetic mutation that results in a nonfunctional protein critical for DNA
repair. Which cellular process is most directly impaired?
A. Apoptosis
B. Cell cycle checkpoint control
C. Oxidative phosphorylation
D. Protein synthesis
Correct ,,,,answer,,,: B
Rationale: DNA repair proteins are essential for maintaining genomic integrity during
the cell cycle. Without them, cell cycle checkpoints (especially G1/S and G2/M) fail,
allowing mutations to accumulate. Apoptosis (A) may be triggered secondarily, but it is
not the primary impaired process. Oxidative phosphorylation (C) involves mitochondria.
Protein synthesis (D) involves ribosomes and translation machinery.
,Question 2
In a patient with chronic heart failure, which compensatory mechanism eventually
becomes maladaptive and accelerates disease progression?
A. Increased preload via Frank-Starling mechanism
B. Activation of the renin-angiotensin-aldosterone system (RAAS)
C. Increased heart rate via sympathetic stimulation
D. All of the above
Correct ,,,,answer,,,: D
Rationale: All three mechanisms initially compensate for reduced cardiac output but
later cause harm: increased preload leads to pulmonary/systemic congestion; RAAS
causes sodium/water retention and fibrosis; chronic sympathetic activation increases
myocardial oxygen demand and arrhythmia risk.
Question 3
Which finding is characteristic of type I hypersensitivity?
A. Immune complex deposition in glomeruli
B. CD8+ T-cell mediated destruction of pancreatic beta cells
C. Mast cell degranulation triggered by cross-linking of IgE
D. Antibody-mediated hemolysis in a transfusion reaction
Correct ,,,,answer,,,: C
Rationale: Type I hypersensitivity (immediate) involves IgE binding to mast
cells/basophils, with cross-linking by allergen triggering degranulation (histamine,
leukotrienes). (A) is type III, (B) is type IV (cell-mediated), (D) is type II (antibody-
dependent cytotoxicity).
,Question 4
A patient with diabetic ketoacidosis has an arterial blood gas: pH 7.25, PaCO2 30 mmHg,
HCO3- 12 mEq/L. What is the primary acid-base disorder and compensation?
A. Metabolic acidosis with appropriate respiratory compensation (acute)
B. Metabolic acidosis with appropriate respiratory compensation (chronic)
C. Respiratory acidosis with metabolic compensation
D. Mixed metabolic acidosis and respiratory alkalosis
Correct ,,,,answer,,,: B
Rationale: Low pH, low HCO3- → metabolic acidosis. Expected PaCO2 = 1.5 × HCO3- +
8 ± 2 = 1.5×12+8 = 26 (range 24–28). Patient’s PaCO2 is 30, slightly above, but still
within chronic compensatory range (metabolic acidosis → hyperventilation; chronic
because DKA develops over hours, not minutes). (A) uses acute formula (PaCO2 =
HCO3- + 15) which gives 27; 30 is slightly higher but acceptable. Best ,,,,answer,,, is
chronic compensation.
Question 5
A 45-year-old woman presents with fatigue, pallor, and paresthesias in her hands. Lab:
hemoglobin 9 g/dL, mean corpuscular volume (MCV) 110 fL, low vitamin B12. Which
pathophysiologic process explains the neurologic symptoms?
A. Demyelination of dorsal columns and corticospinal tracts
B. Axonal degeneration of peripheral motor neurons
C. Impaired synthesis of heme in erythroid precursors
D. Autoimmune destruction of gastric parietal cells
Correct ,,,,answer,,,: A
Rationale: Vitamin B12 deficiency causes subacute combined degeneration of spinal
cord – demyelination of dorsal columns (loss of vibration/proprioception) and
, corticospinal tracts (weakness). (B) is not typical. (C) describes iron deficiency. (D) is
cause (pernicious anemia) but not the mechanism of neurologic symptoms.
Question 6
Which statement best describes necroptosis?
A. A form of programmed necrosis requiring receptor-interacting protein kinases
(RIPK1/RIPK3)
B. Caspase-dependent apoptosis triggered by mitochondrial cytochrome c release
C. Unprogrammed cell death due to severe ATP depletion
D. Autophagic cell death characterized by lysosomal degradation
Correct ,,,,answer,,,: A
Rationale: Necroptosis is a regulated form of necrosis, activated when caspases are
inhibited, and requires RIPK1/RIPK3 and MLKL. (B) describes intrinsic apoptosis, (C)
describes oncotic necrosis, (D) describes autophagic cell death.
Question 7
A patient with cirrhosis develops ascites. Which hemodynamic abnormality is the
primary driver of sodium and water retention in this setting?
A. Increased hydrostatic pressure in splanchnic capillaries
B. Decreased plasma colloid osmotic pressure due to hypoalbuminemia
C. Splanchnic arterial vasodilation leading to effective arterial blood volume depletion
D. Increased hepatic lymph formation exceeding lymphatic drainage
Correct ,,,,answer,,,: C
Rationale: In cirrhosis, splanchnic vasodilation reduces effective arterial blood volume,
activating RAAS and sympathetic nerves, causing renal sodium/water retention. (A) and
