NSG 3113 Pathophysiology Final Exam Predictor | Most
Frequently Tested Questions with Detailed Rationales
Question 1
A client with long-standing, poorly controlled gastroesophageal reflux
disease (GERD) undergoes an upper endoscopy, which reveals that the
stratified squamous epithelium of the lower esophagus has been
replaced by columnar ciliated epithelium containing goblet cells. Which
cellular adaptation process has occurred?
A. Atrophy
B. Hypertrophy
C. Metaplasia
D. Dysplasia
Correct Answer: C. Metaplasia
Detailed Rationale: Metaplasia is a reversible replacement of one adult
cell type by another adult cell type, often in response to chronic
irritation or inflammation (such as gastric acid exposure in GERD). While
adaptive, persistent exposure can progress to dysplasia and carcinoma.
Question 2
A client with acute renal failure has a serum potassium level of 6.8
mEq/L. Which electrocardiographic (ECG) finding is characteristic of
severe hyperkalemia and requires immediate clinical intervention?
A. Prominent U waves and flattened T waves
,B. Tall, peaked T waves and widened QRS complexes
C. Prolonged PR interval with shortened QT interval
D. ST-segment depression with inverted T waves
Correct Answer: B. Tall, peaked T waves and widened QRS complexes
Detailed Rationale: Hyperkalemia alters the resting membrane
potential of cardiac muscle cells, making them hyperexcitable initially
and then refractory. Classic ECG changes progress from tall, peaked T
waves to prolonged PR intervals, widened QRS complexes, and
ultimately ventricular fibrillation or asystole.
Question 3
A client with chronic obstructive pulmonary disease (COPD) retains
carbon dioxide, resulting in chronic respiratory acidosis. Which
compensatory mechanism is primarily initiated by the kidneys to
normalize blood pH?
A. Excretion of large amounts of bicarbonate ion in the urine
B. Increased reabsorption of bicarbonate and excretion of hydrogen
ions by the renal tubules
C. Suppression of the renin-angiotensin-aldosterone system
D. Enhanced production of carbonic acid in the loop of Henle
Correct Answer: B. Increased reabsorption of bicarbonate and excretion
of hydrogen ions by the renal tubules
Detailed Rationale: To compensate for chronic respiratory acidosis
(elevated PaCO2 and low pH), the kidneys retain filtered bicarbonate
and secrete excess hydrogen ions into the urine, raising plasma
,bicarbonate levels over several days to restore the normal 20:1
bicarbonate-to-carbonic-acid ratio.
Question 4
Systemic lupus erythematosus (SLE) is characterized by the widespread
deposition of circulating antigen-antibody complexes into blood vessels,
glomeruli, and joint synovium. This tissue injury is classified as which
type of hypersensitivity reaction?
A. Type I IgE-mediated hypersensitivity
B. Type II cytotoxic hypersensitivity
C. Type III immune complex-mediated hypersensitivity
D. Type IV cell-mediated hypersensitivity
Correct Answer: C. Type III immune complex-mediated hypersensitivity
Detailed Rationale: Type III hypersensitivity occurs when circulating
antigen-antibody (immune) complexes deposit in tissue
microvasculature. This triggers complement activation, neutrophil
recruitment, and localized inflammation, causing the multi-organ tissue
damage seen in SLE.
Question 5
What is the basic genetic inheritance pattern and underlying molecular
defect in Duchenne Muscular Dystrophy?
A. Autosomal dominant mutation affecting the structural protein
spectrin
B. X-linked recessive mutation in the gene encoding dystrophin, leading
to muscle cell membrane instability and necrosis
, C. Autosomal recessive trinucleotide repeat expansion on chromosome
19
D. Mitochondrial deletion affecting cellular respiration in skeletal
muscle
Correct Answer: B. X-linked recessive mutation in the gene encoding
dystrophin, leading to muscle cell membrane instability and neurosis
Detailed Rationale: Duchenne muscular dystrophy is an X-linked
recessive disorder caused by mutations in the dystrophin gene. Absence
of functional dystrophin weakens the sarcolemma, making muscle
fibers susceptible to micro-tears, calcium influx, and progressive fiber
necrosis.
Question 6
As a client enters compensated heart failure, the body activates several
neurohormonal mechanisms to maintain cardiac output and blood
pressure. Which of the following describes the initial physiological
action of the Renin-Angiotensin-Aldosterone System (RAAS)?
A. Decreased systemic vascular resistance and profound natriuresis
B. Vasoconstriction via angiotensin II and sodium/water retention via
aldosterone to increase blood volume and preload
C. Direct stimulation of beta-2 adrenergic receptors to relax bronchial
smooth muscle
D. Immediate destruction of circulating catecholamines
Correct Answer: B. Vasoconstriction via angiotensin II and
sodium/water retention via aldosterone to increase blood volume and
preload
Frequently Tested Questions with Detailed Rationales
Question 1
A client with long-standing, poorly controlled gastroesophageal reflux
disease (GERD) undergoes an upper endoscopy, which reveals that the
stratified squamous epithelium of the lower esophagus has been
replaced by columnar ciliated epithelium containing goblet cells. Which
cellular adaptation process has occurred?
A. Atrophy
B. Hypertrophy
C. Metaplasia
D. Dysplasia
Correct Answer: C. Metaplasia
Detailed Rationale: Metaplasia is a reversible replacement of one adult
cell type by another adult cell type, often in response to chronic
irritation or inflammation (such as gastric acid exposure in GERD). While
adaptive, persistent exposure can progress to dysplasia and carcinoma.
Question 2
A client with acute renal failure has a serum potassium level of 6.8
mEq/L. Which electrocardiographic (ECG) finding is characteristic of
severe hyperkalemia and requires immediate clinical intervention?
A. Prominent U waves and flattened T waves
,B. Tall, peaked T waves and widened QRS complexes
C. Prolonged PR interval with shortened QT interval
D. ST-segment depression with inverted T waves
Correct Answer: B. Tall, peaked T waves and widened QRS complexes
Detailed Rationale: Hyperkalemia alters the resting membrane
potential of cardiac muscle cells, making them hyperexcitable initially
and then refractory. Classic ECG changes progress from tall, peaked T
waves to prolonged PR intervals, widened QRS complexes, and
ultimately ventricular fibrillation or asystole.
Question 3
A client with chronic obstructive pulmonary disease (COPD) retains
carbon dioxide, resulting in chronic respiratory acidosis. Which
compensatory mechanism is primarily initiated by the kidneys to
normalize blood pH?
A. Excretion of large amounts of bicarbonate ion in the urine
B. Increased reabsorption of bicarbonate and excretion of hydrogen
ions by the renal tubules
C. Suppression of the renin-angiotensin-aldosterone system
D. Enhanced production of carbonic acid in the loop of Henle
Correct Answer: B. Increased reabsorption of bicarbonate and excretion
of hydrogen ions by the renal tubules
Detailed Rationale: To compensate for chronic respiratory acidosis
(elevated PaCO2 and low pH), the kidneys retain filtered bicarbonate
and secrete excess hydrogen ions into the urine, raising plasma
,bicarbonate levels over several days to restore the normal 20:1
bicarbonate-to-carbonic-acid ratio.
Question 4
Systemic lupus erythematosus (SLE) is characterized by the widespread
deposition of circulating antigen-antibody complexes into blood vessels,
glomeruli, and joint synovium. This tissue injury is classified as which
type of hypersensitivity reaction?
A. Type I IgE-mediated hypersensitivity
B. Type II cytotoxic hypersensitivity
C. Type III immune complex-mediated hypersensitivity
D. Type IV cell-mediated hypersensitivity
Correct Answer: C. Type III immune complex-mediated hypersensitivity
Detailed Rationale: Type III hypersensitivity occurs when circulating
antigen-antibody (immune) complexes deposit in tissue
microvasculature. This triggers complement activation, neutrophil
recruitment, and localized inflammation, causing the multi-organ tissue
damage seen in SLE.
Question 5
What is the basic genetic inheritance pattern and underlying molecular
defect in Duchenne Muscular Dystrophy?
A. Autosomal dominant mutation affecting the structural protein
spectrin
B. X-linked recessive mutation in the gene encoding dystrophin, leading
to muscle cell membrane instability and necrosis
, C. Autosomal recessive trinucleotide repeat expansion on chromosome
19
D. Mitochondrial deletion affecting cellular respiration in skeletal
muscle
Correct Answer: B. X-linked recessive mutation in the gene encoding
dystrophin, leading to muscle cell membrane instability and neurosis
Detailed Rationale: Duchenne muscular dystrophy is an X-linked
recessive disorder caused by mutations in the dystrophin gene. Absence
of functional dystrophin weakens the sarcolemma, making muscle
fibers susceptible to micro-tears, calcium influx, and progressive fiber
necrosis.
Question 6
As a client enters compensated heart failure, the body activates several
neurohormonal mechanisms to maintain cardiac output and blood
pressure. Which of the following describes the initial physiological
action of the Renin-Angiotensin-Aldosterone System (RAAS)?
A. Decreased systemic vascular resistance and profound natriuresis
B. Vasoconstriction via angiotensin II and sodium/water retention via
aldosterone to increase blood volume and preload
C. Direct stimulation of beta-2 adrenergic receptors to relax bronchial
smooth muscle
D. Immediate destruction of circulating catecholamines
Correct Answer: B. Vasoconstriction via angiotensin II and
sodium/water retention via aldosterone to increase blood volume and
preload
