NUR 502 Final Exam: Advanced Pathophysiology -
St. Thomas University Updated and Latest
Questions and Correct Answers with Rationale
1. Which of the following describes the compensatory role of the renin-angiotensin-
aldosterone system (RAAS) in heart failure?
A. It decreases systemic vascular resistance to improve cardiac output.
B. It increases preload and afterload through sodium retention and vasoconstriction.
C. It promotes diuresis to reduce the workload of the failing heart.
D. It causes bradycardia to allow more time for ventricular filling.
Correct Answer: B
Rationale: In heart failure, the RAAS is activated in response to decreased renal perfusion.
Angiotensin II causes potent vasoconstriction which increases afterload while aldosterone
promotes sodium and water retention to increase preload. Although initially compensatory
to maintain blood pressure, these effects eventually lead to harmful cardiac remodeling.
Chronic activation of this system worsens the clinical progression of heart failure.
Pharmacological management often focuses on inhibiting these pathways to improve
patient outcomes.
2. What is the primary mechanism behind insulin resistance in Type 2 Diabetes Mellitus?
A. Increased sensitivity of skeletal muscle to circulating fatty acids.
B. Absolute deficiency of insulin due to autoimmune destruction of beta cells.
C. Excessive production of glucagon-like peptide-1 in the intestines.
D. Downregulation of insulin receptors and impaired intracellular signaling.
Correct Answer: D
Rationale: Type 2 diabetes is characterized by insulin resistance where target tissues fail
to respond normally to insulin. This process often involves the downregulation of insulin
receptors and defects in post-receptor signaling pathways. Chronic overnutrition and
obesity contribute significantly to this state through the release of pro-inflammatory
cytokines. As a result, glucose uptake into muscle and adipose tissue is diminished despite
high insulin levels. Over time, the pancreatic beta cells become exhausted, leading to
progressive hyperglycemia.
3. Why do patients with chronic kidney disease (CKD) frequently develop normochromic
normocytic anemia?
A. Reduced production of erythropoietin by the peritubular fibroblasts.
B. Shortened lifespan of red blood cells due to uremic toxins.
,C. Loss of iron through the urine due to glomerular damage.
D. Vitamin B12 malabsorption caused by metabolic acidosis.
Correct Answer: A
Rationale: The kidneys are the primary site for the production of erythropoietin, a
hormone that stimulates red blood cell production in the bone marrow. As CKD progresses,
the loss of renal mass results in a significant deficiency of this hormone. Consequently, the
bone marrow produces fewer red blood cells, leading to chronic anemia. While uremic
toxins can shorten RBC lifespan, erythropoietin deficiency is the most significant factor.
Exogenous erythropoietin stimulating agents are standard treatments to manage this
complication.
4. Which pathophysiological process is responsible for the late-phase reaction in bronchial
asthma?
A. Inflammatory cell infiltration and synthesis of leukotrienes and prostaglandins.
B. Activation of the parasympathetic nervous system causing bronchospasm.
C. Rapid buildup of pleural fluid leading to lung compression.
D. Immediate IgE-mediated mast cell degranulation and histamine release.
Correct Answer: A
Rationale: The late-phase reaction in asthma occurs several hours after the initial allergen
exposure. It is driven by the recruitment of eosinophils, neutrophils, and T-lymphocytes to
the airway mucosa. These cells release secondary mediators like leukotrienes and
prostaglandins that sustain inflammation. This phase is characterized by prolonged
bronchoconstriction, increased mucus production, and airway edema. Understanding this
phase is crucial because it explains why corticosteroids are necessary for long-term asthma
control.
5. What process allows malignant cells to detach from the primary tumor and invade
surrounding tissues?
A. Contact inhibition of cell growth.
B. Epithelial-mesenchymal transition (EMT).
C. Increased expression of cell-to-cell adhesion molecules like E-cadherin.
D. Activation of the extrinsic apoptotic pathway.
Correct Answer: B
Rationale: Epithelial-mesenchymal transition (EMT) is a biological process where
epithelial cells lose their polarity and adhesion. During this transition, cells acquire
migratory and invasive properties characteristic of mesenchymal stem cells. This allows
cancer cells to break through the basement membrane and enter the bloodstream or
, lymphatic system. The downregulation of E-cadherin is a hallmark of this process, reducing
the glue that holds cells together. EMT is a critical step in the metastatic cascade and cancer
progression.
6. How does hyperkalemia affect the resting membrane potential of cardiac myocytes?
A. It hyperpolarizes the membrane, making it harder to reach threshold.
B. It hypopolarizes the membrane, moving the potential closer to the threshold.
C. It increases the velocity of the phase 0 depolarization.
D. It decreases the permeability of the membrane to sodium ions.
Correct Answer: B
Rationale: Hyperkalemia increases the extracellular concentration of potassium, which
reduces the concentration gradient across the cell membrane. This change results in a less
negative (hypopolarized) resting membrane potential. Because the potential is closer to the
threshold, the cells initially become more excitable. However, persistent depolarization can
eventually lead to inactivated sodium channels and impaired conduction. These electrical
changes are visible on an ECG as peaked T waves and widened QRS complexes.
7. In an autosomal dominant inheritance pattern, what is the probability that an affected
heterozygous parent will pass the trait to their offspring?
A. 25%
B. 75%
C. 50%
D. 100%
Correct Answer: C
Rationale: Autosomal dominant disorders require only one copy of the mutated gene for
the disease to manifest. A heterozygous parent has one affected allele and one normal
allele. During meiosis, there is a 50% chance that the offspring will inherit the affected
allele. This probability remains the same for every pregnancy regardless of the gender of
the child. Huntington’s disease is a classic example of this type of genetic inheritance.
8. Which cytokine is primarily responsible for the systemic manifestations of sepsis, such as
fever and hypotension?
A. Interleukin-10
B. Transforming Growth Factor-beta
C. Tumor Necrosis Factor-alpha (TNF-alpha)
D. Interferon-gamma
St. Thomas University Updated and Latest
Questions and Correct Answers with Rationale
1. Which of the following describes the compensatory role of the renin-angiotensin-
aldosterone system (RAAS) in heart failure?
A. It decreases systemic vascular resistance to improve cardiac output.
B. It increases preload and afterload through sodium retention and vasoconstriction.
C. It promotes diuresis to reduce the workload of the failing heart.
D. It causes bradycardia to allow more time for ventricular filling.
Correct Answer: B
Rationale: In heart failure, the RAAS is activated in response to decreased renal perfusion.
Angiotensin II causes potent vasoconstriction which increases afterload while aldosterone
promotes sodium and water retention to increase preload. Although initially compensatory
to maintain blood pressure, these effects eventually lead to harmful cardiac remodeling.
Chronic activation of this system worsens the clinical progression of heart failure.
Pharmacological management often focuses on inhibiting these pathways to improve
patient outcomes.
2. What is the primary mechanism behind insulin resistance in Type 2 Diabetes Mellitus?
A. Increased sensitivity of skeletal muscle to circulating fatty acids.
B. Absolute deficiency of insulin due to autoimmune destruction of beta cells.
C. Excessive production of glucagon-like peptide-1 in the intestines.
D. Downregulation of insulin receptors and impaired intracellular signaling.
Correct Answer: D
Rationale: Type 2 diabetes is characterized by insulin resistance where target tissues fail
to respond normally to insulin. This process often involves the downregulation of insulin
receptors and defects in post-receptor signaling pathways. Chronic overnutrition and
obesity contribute significantly to this state through the release of pro-inflammatory
cytokines. As a result, glucose uptake into muscle and adipose tissue is diminished despite
high insulin levels. Over time, the pancreatic beta cells become exhausted, leading to
progressive hyperglycemia.
3. Why do patients with chronic kidney disease (CKD) frequently develop normochromic
normocytic anemia?
A. Reduced production of erythropoietin by the peritubular fibroblasts.
B. Shortened lifespan of red blood cells due to uremic toxins.
,C. Loss of iron through the urine due to glomerular damage.
D. Vitamin B12 malabsorption caused by metabolic acidosis.
Correct Answer: A
Rationale: The kidneys are the primary site for the production of erythropoietin, a
hormone that stimulates red blood cell production in the bone marrow. As CKD progresses,
the loss of renal mass results in a significant deficiency of this hormone. Consequently, the
bone marrow produces fewer red blood cells, leading to chronic anemia. While uremic
toxins can shorten RBC lifespan, erythropoietin deficiency is the most significant factor.
Exogenous erythropoietin stimulating agents are standard treatments to manage this
complication.
4. Which pathophysiological process is responsible for the late-phase reaction in bronchial
asthma?
A. Inflammatory cell infiltration and synthesis of leukotrienes and prostaglandins.
B. Activation of the parasympathetic nervous system causing bronchospasm.
C. Rapid buildup of pleural fluid leading to lung compression.
D. Immediate IgE-mediated mast cell degranulation and histamine release.
Correct Answer: A
Rationale: The late-phase reaction in asthma occurs several hours after the initial allergen
exposure. It is driven by the recruitment of eosinophils, neutrophils, and T-lymphocytes to
the airway mucosa. These cells release secondary mediators like leukotrienes and
prostaglandins that sustain inflammation. This phase is characterized by prolonged
bronchoconstriction, increased mucus production, and airway edema. Understanding this
phase is crucial because it explains why corticosteroids are necessary for long-term asthma
control.
5. What process allows malignant cells to detach from the primary tumor and invade
surrounding tissues?
A. Contact inhibition of cell growth.
B. Epithelial-mesenchymal transition (EMT).
C. Increased expression of cell-to-cell adhesion molecules like E-cadherin.
D. Activation of the extrinsic apoptotic pathway.
Correct Answer: B
Rationale: Epithelial-mesenchymal transition (EMT) is a biological process where
epithelial cells lose their polarity and adhesion. During this transition, cells acquire
migratory and invasive properties characteristic of mesenchymal stem cells. This allows
cancer cells to break through the basement membrane and enter the bloodstream or
, lymphatic system. The downregulation of E-cadherin is a hallmark of this process, reducing
the glue that holds cells together. EMT is a critical step in the metastatic cascade and cancer
progression.
6. How does hyperkalemia affect the resting membrane potential of cardiac myocytes?
A. It hyperpolarizes the membrane, making it harder to reach threshold.
B. It hypopolarizes the membrane, moving the potential closer to the threshold.
C. It increases the velocity of the phase 0 depolarization.
D. It decreases the permeability of the membrane to sodium ions.
Correct Answer: B
Rationale: Hyperkalemia increases the extracellular concentration of potassium, which
reduces the concentration gradient across the cell membrane. This change results in a less
negative (hypopolarized) resting membrane potential. Because the potential is closer to the
threshold, the cells initially become more excitable. However, persistent depolarization can
eventually lead to inactivated sodium channels and impaired conduction. These electrical
changes are visible on an ECG as peaked T waves and widened QRS complexes.
7. In an autosomal dominant inheritance pattern, what is the probability that an affected
heterozygous parent will pass the trait to their offspring?
A. 25%
B. 75%
C. 50%
D. 100%
Correct Answer: C
Rationale: Autosomal dominant disorders require only one copy of the mutated gene for
the disease to manifest. A heterozygous parent has one affected allele and one normal
allele. During meiosis, there is a 50% chance that the offspring will inherit the affected
allele. This probability remains the same for every pregnancy regardless of the gender of
the child. Huntington’s disease is a classic example of this type of genetic inheritance.
8. Which cytokine is primarily responsible for the systemic manifestations of sepsis, such as
fever and hypotension?
A. Interleukin-10
B. Transforming Growth Factor-beta
C. Tumor Necrosis Factor-alpha (TNF-alpha)
D. Interferon-gamma
