NR283 PATHOPHYSIOLOGY EXAM 3
PRACTICE QUESTIONS AND ANSWERS
1. A patient with Type 1 Diabetes Mellitus presents with Kussmaul respirations and a fruity
breath odor. Which physiological mechanism explains the respiratory pattern?
A. Compensatory hyperventilation to decrease arterial PCO2 and increase pH
B. Hypoventilation to retain CO2 and neutralize metabolic alkalosis
C. Reduced alveolar ventilation due to depressed central nervous system function
D. Increased oxygen demand to facilitate anaerobic metabolism
Answer: A
Conceptual Explanation: Kussmaul respirations are deep, rapid breaths that serve as a
compensatory mechanism in metabolic acidosis (DKA) to blow off carbon dioxide, thereby
lowering the acid load in the body.
2. In patients with Chronic Kidney Disease (CKD), what is the primary reason for the
development of secondary hyperparathyroidism?
A. Excessive dietary intake of calcium leading to feedback inhibition
B. Hypocalcemia resulting from hyperphosphatemia and decreased Vitamin D activation
C. Direct stimulation of the parathyroid gland by erythropoietin deficiency
,D. Increased renal excretion of calcium due to tubular damage
Answer: B
Conceptual Explanation: In CKD, the kidneys fail to activate Vitamin D and cannot excrete
phosphate. Hyperphosphatemia binds calcium, leading to hypocalcemia, which chronically
stimulates the parathyroid glands.
3. A patient is diagnosed with Graves’ Disease. What is the underlying pathophysiology of the
exophthalmos observed in this condition?
A. Increased intracranial pressure affecting the optic nerve
B. Accumulation of glycosaminoglycans and inflammation in the retro-orbital space
C. Atrophy of the extraocular muscles due to thyroid hormone toxicity
D. Excessive sympathetic stimulation of the upper eyelid muscles
Answer: B
Conceptual Explanation: Graves’ ophthalmopathy is caused by autoimmune-mediated
inflammation and the accumulation of edema and glycosaminoglycans behind the eye,
pushing the eyeball forward.
4. Which of the following describes the pathophysiology of a pre-renal Acute Kidney Injury
(AKI)?
A. Decreased renal perfusion due to systemic hypotension or hypovolemia
B. Mechanical obstruction of the urinary tract by a renal calculi
, C. Direct damage to the renal parenchyma from nephrotoxic medications
D. Inflammation of the glomeruli following a streptococcal infection
Answer: A
Conceptual Explanation: Pre-renal AKI is caused by factors that reduce blood flow to the
kidneys, such as dehydration, heart failure, or shock, without initial direct damage to the
kidney tissue itself.
5. A patient presents with weight gain, a ‘buffalo hump,’ and purple striae on the abdomen.
Which hormone imbalance is most likely responsible?
A. Inadequate production of antidiuretic hormone by the posterior pituitary
B. Deficiency of aldosterone production by the adrenal cortex
C. Excessive secretion of growth hormone by the anterior pituitary
D. Excessive production of cortisol by the adrenal cortex
Answer: D
Conceptual Explanation: These are classic signs of Cushing’s syndrome, which results
from prolonged exposure to high levels of glucocorticoids (cortisol).
6. In the development of Peptic Ulcer Disease (PUD), how does H. pylori contribute to
mucosal erosion?
A. It secretes urease, which produces ammonia to neutralize stomach acid but damages the
mucosa
PRACTICE QUESTIONS AND ANSWERS
1. A patient with Type 1 Diabetes Mellitus presents with Kussmaul respirations and a fruity
breath odor. Which physiological mechanism explains the respiratory pattern?
A. Compensatory hyperventilation to decrease arterial PCO2 and increase pH
B. Hypoventilation to retain CO2 and neutralize metabolic alkalosis
C. Reduced alveolar ventilation due to depressed central nervous system function
D. Increased oxygen demand to facilitate anaerobic metabolism
Answer: A
Conceptual Explanation: Kussmaul respirations are deep, rapid breaths that serve as a
compensatory mechanism in metabolic acidosis (DKA) to blow off carbon dioxide, thereby
lowering the acid load in the body.
2. In patients with Chronic Kidney Disease (CKD), what is the primary reason for the
development of secondary hyperparathyroidism?
A. Excessive dietary intake of calcium leading to feedback inhibition
B. Hypocalcemia resulting from hyperphosphatemia and decreased Vitamin D activation
C. Direct stimulation of the parathyroid gland by erythropoietin deficiency
,D. Increased renal excretion of calcium due to tubular damage
Answer: B
Conceptual Explanation: In CKD, the kidneys fail to activate Vitamin D and cannot excrete
phosphate. Hyperphosphatemia binds calcium, leading to hypocalcemia, which chronically
stimulates the parathyroid glands.
3. A patient is diagnosed with Graves’ Disease. What is the underlying pathophysiology of the
exophthalmos observed in this condition?
A. Increased intracranial pressure affecting the optic nerve
B. Accumulation of glycosaminoglycans and inflammation in the retro-orbital space
C. Atrophy of the extraocular muscles due to thyroid hormone toxicity
D. Excessive sympathetic stimulation of the upper eyelid muscles
Answer: B
Conceptual Explanation: Graves’ ophthalmopathy is caused by autoimmune-mediated
inflammation and the accumulation of edema and glycosaminoglycans behind the eye,
pushing the eyeball forward.
4. Which of the following describes the pathophysiology of a pre-renal Acute Kidney Injury
(AKI)?
A. Decreased renal perfusion due to systemic hypotension or hypovolemia
B. Mechanical obstruction of the urinary tract by a renal calculi
, C. Direct damage to the renal parenchyma from nephrotoxic medications
D. Inflammation of the glomeruli following a streptococcal infection
Answer: A
Conceptual Explanation: Pre-renal AKI is caused by factors that reduce blood flow to the
kidneys, such as dehydration, heart failure, or shock, without initial direct damage to the
kidney tissue itself.
5. A patient presents with weight gain, a ‘buffalo hump,’ and purple striae on the abdomen.
Which hormone imbalance is most likely responsible?
A. Inadequate production of antidiuretic hormone by the posterior pituitary
B. Deficiency of aldosterone production by the adrenal cortex
C. Excessive secretion of growth hormone by the anterior pituitary
D. Excessive production of cortisol by the adrenal cortex
Answer: D
Conceptual Explanation: These are classic signs of Cushing’s syndrome, which results
from prolonged exposure to high levels of glucocorticoids (cortisol).
6. In the development of Peptic Ulcer Disease (PUD), how does H. pylori contribute to
mucosal erosion?
A. It secretes urease, which produces ammonia to neutralize stomach acid but damages the
mucosa
