NR507 ADVANCED
PATHOPHYSIOLOGY EXAM
COMPREHENSIVE STUDY GUIDE
1. A patient is experiencing muscular atrophy following prolonged immobilization. Which
cellular process primarily drives this reduction in muscle mass?
A. Increased protein synthesis
B. Ubiquitin-proteasome pathway activation
C. Ribosomal biogenesis
D. Hyperplasia of connective tissue
Answer: B
Conceptual Explanation: Atrophy is the result of decreased protein synthesis and/or
increased protein degradation via the ubiquitin-proteasome pathway, often triggered by
disuse or nutrient deficiency.
2. Which chromosomal abnormality is characterized by a 45,X karyotype, resulting in short
stature and webbed neck?
A. Turner syndrome
,B. Down syndrome
C. Klinefelter syndrome
D. Edwards syndrome
Answer: A
Conceptual Explanation: Turner syndrome is a monosomy of the X chromosome (45,X).
Klinefelter is 47,XXY, and Down syndrome is Trisomy 21.
3. In the hypoxic cell injury sequence, what is the immediate consequence of the failure of
the sodium-potassium pump?
A. Cellular swelling due to water influx
B. Increased mitochondrial ATP production
C. Intracellular accumulation of potassium
D. Reduction in lactic acid production
Answer: A
Conceptual Explanation: When ATP levels drop, the Na+/K+ pump fails. Sodium
accumulates inside the cell, creating an osmotic gradient that pulls water into the cell,
leading to swelling (oncosis).
4. Which type of hypersensitivity reaction is mediated by IgE and involves the release of
histamine from mast cells?
A. Type III
, B. Type II
C. Type I
D. Type IV
Answer: C
Conceptual Explanation: Type I hypersensitivity is IgE-mediated and involves immediate
mast cell degranulation. Type II is tissue-specific, Type III is immune-complex mediated,
and Type IV is cell-mediated (delayed).
5. A patient with systemic lupus erythematosus (SLE) experiences renal damage caused by
the deposition of antigen-antibody complexes. This is an example of:
A. Type III hypersensitivity
B. Type II hypersensitivity
C. Type I hypersensitivity
D. Type IV hypersensitivity
Answer: A
Conceptual Explanation: SLE is a classic example of Type III hypersensitivity, where
immune complexes form in the circulation and are later deposited in vessel walls or
extravascular tissues like the kidneys.
6. Which characteristic is a hallmark of malignant tumors compared to benign tumors?
A. Slow growth rate
PATHOPHYSIOLOGY EXAM
COMPREHENSIVE STUDY GUIDE
1. A patient is experiencing muscular atrophy following prolonged immobilization. Which
cellular process primarily drives this reduction in muscle mass?
A. Increased protein synthesis
B. Ubiquitin-proteasome pathway activation
C. Ribosomal biogenesis
D. Hyperplasia of connective tissue
Answer: B
Conceptual Explanation: Atrophy is the result of decreased protein synthesis and/or
increased protein degradation via the ubiquitin-proteasome pathway, often triggered by
disuse or nutrient deficiency.
2. Which chromosomal abnormality is characterized by a 45,X karyotype, resulting in short
stature and webbed neck?
A. Turner syndrome
,B. Down syndrome
C. Klinefelter syndrome
D. Edwards syndrome
Answer: A
Conceptual Explanation: Turner syndrome is a monosomy of the X chromosome (45,X).
Klinefelter is 47,XXY, and Down syndrome is Trisomy 21.
3. In the hypoxic cell injury sequence, what is the immediate consequence of the failure of
the sodium-potassium pump?
A. Cellular swelling due to water influx
B. Increased mitochondrial ATP production
C. Intracellular accumulation of potassium
D. Reduction in lactic acid production
Answer: A
Conceptual Explanation: When ATP levels drop, the Na+/K+ pump fails. Sodium
accumulates inside the cell, creating an osmotic gradient that pulls water into the cell,
leading to swelling (oncosis).
4. Which type of hypersensitivity reaction is mediated by IgE and involves the release of
histamine from mast cells?
A. Type III
, B. Type II
C. Type I
D. Type IV
Answer: C
Conceptual Explanation: Type I hypersensitivity is IgE-mediated and involves immediate
mast cell degranulation. Type II is tissue-specific, Type III is immune-complex mediated,
and Type IV is cell-mediated (delayed).
5. A patient with systemic lupus erythematosus (SLE) experiences renal damage caused by
the deposition of antigen-antibody complexes. This is an example of:
A. Type III hypersensitivity
B. Type II hypersensitivity
C. Type I hypersensitivity
D. Type IV hypersensitivity
Answer: A
Conceptual Explanation: SLE is a classic example of Type III hypersensitivity, where
immune complexes form in the circulation and are later deposited in vessel walls or
extravascular tissues like the kidneys.
6. Which characteristic is a hallmark of malignant tumors compared to benign tumors?
A. Slow growth rate
