NUR-641E ADVANCED
PATHOPHYSIOLOGY AND
PHARMACOLOGY EXAM PREP
1. A patient with chronic kidney disease (CKD) presents with secondary hyperparathyroidism.
What is the primary underlying mechanism for this condition?
A. Decreased production of 1,25-dihydroxyvitamin D3
B. Hypophosphatemia resulting from impaired renal reabsorption
C. Hypercalcemia due to excessive Vitamin D intake
D. Direct stimulation of the parathyroid gland by erythropoietin
Answer: A
Conceptual Explanation: In CKD, the kidneys fail to convert Vitamin D to its active form
(1,25-dihydroxyvitamin D3), leading to hypocalcemia and subsequent overstimulation of
the parathyroid glands.
2. Which of the following cellular changes is most characteristic of irreversible cell injury?
A. Mitochondrial swelling
B. Karyorrhexis and cell membrane rupture
C. Plasma membrane blebbing
,D. Ribosomal detachment from the ER
Answer: B
Conceptual Explanation: Karyorrhexis (fragmentation of the nucleus) and the loss of
membrane integrity are hallmarks of irreversible cell death, whereas swelling and blebbing
can be reversible.
3. A patient is prescribed a non-selective beta-blocker. Which underlying condition would be
a major contraindication for this medication?
A. Hypertension
B. Atrial Fibrillation
C. Asthma
D. Hyperthyroidism
Answer: C
Conceptual Explanation: Non-selective beta-blockers (like Propranolol) block Beta-2
receptors in the lungs, which can cause bronchoconstriction in patients with asthma or
COPD.
4. What is the pathophysiological cause of the ‘Dawn Phenomenon’ in patients with Type 1
Diabetes?
A. Nocturnal surge of growth hormone and cortisol
B. Nighttime hypoglycemic episodes triggering rebound hyperglycemia
, C. Inadequate insulin dosage before bedtime
D. Excessive carbohydrate intake before sleep
Answer: A
Conceptual Explanation: The Dawn Phenomenon is caused by the natural circadian
release of growth hormone and cortisol in the early morning, which antagonizes insulin
and raises blood glucose.
5. In the setting of acute respiratory distress syndrome (ARDS), what is the primary cause of
severe hypoxemia?
A. Increased dead space ventilation
B. Alveolar-capillary membrane damage leading to right-to-left shunting
C. Hypoventilation due to central nervous system depression
D. Decreased pulmonary artery pressure
Answer: B
Conceptual Explanation: ARDS causes damage to the alveolar-capillary membrane,
leading to fluid-filled alveoli, which results in a right-to-left shunt where blood bypasses
oxygenation.
6. Which pharmacological agent acts by inhibiting the H+/K+ ATPase pump in the gastric
parietal cells?
A. Ranitidine
PATHOPHYSIOLOGY AND
PHARMACOLOGY EXAM PREP
1. A patient with chronic kidney disease (CKD) presents with secondary hyperparathyroidism.
What is the primary underlying mechanism for this condition?
A. Decreased production of 1,25-dihydroxyvitamin D3
B. Hypophosphatemia resulting from impaired renal reabsorption
C. Hypercalcemia due to excessive Vitamin D intake
D. Direct stimulation of the parathyroid gland by erythropoietin
Answer: A
Conceptual Explanation: In CKD, the kidneys fail to convert Vitamin D to its active form
(1,25-dihydroxyvitamin D3), leading to hypocalcemia and subsequent overstimulation of
the parathyroid glands.
2. Which of the following cellular changes is most characteristic of irreversible cell injury?
A. Mitochondrial swelling
B. Karyorrhexis and cell membrane rupture
C. Plasma membrane blebbing
,D. Ribosomal detachment from the ER
Answer: B
Conceptual Explanation: Karyorrhexis (fragmentation of the nucleus) and the loss of
membrane integrity are hallmarks of irreversible cell death, whereas swelling and blebbing
can be reversible.
3. A patient is prescribed a non-selective beta-blocker. Which underlying condition would be
a major contraindication for this medication?
A. Hypertension
B. Atrial Fibrillation
C. Asthma
D. Hyperthyroidism
Answer: C
Conceptual Explanation: Non-selective beta-blockers (like Propranolol) block Beta-2
receptors in the lungs, which can cause bronchoconstriction in patients with asthma or
COPD.
4. What is the pathophysiological cause of the ‘Dawn Phenomenon’ in patients with Type 1
Diabetes?
A. Nocturnal surge of growth hormone and cortisol
B. Nighttime hypoglycemic episodes triggering rebound hyperglycemia
, C. Inadequate insulin dosage before bedtime
D. Excessive carbohydrate intake before sleep
Answer: A
Conceptual Explanation: The Dawn Phenomenon is caused by the natural circadian
release of growth hormone and cortisol in the early morning, which antagonizes insulin
and raises blood glucose.
5. In the setting of acute respiratory distress syndrome (ARDS), what is the primary cause of
severe hypoxemia?
A. Increased dead space ventilation
B. Alveolar-capillary membrane damage leading to right-to-left shunting
C. Hypoventilation due to central nervous system depression
D. Decreased pulmonary artery pressure
Answer: B
Conceptual Explanation: ARDS causes damage to the alveolar-capillary membrane,
leading to fluid-filled alveoli, which results in a right-to-left shunt where blood bypasses
oxygenation.
6. Which pharmacological agent acts by inhibiting the H+/K+ ATPase pump in the gastric
parietal cells?
A. Ranitidine
