HSC 4558 Exam 3 V2 | HSC 4558 Pathophysiology II | Actual Q&A with
Rationale (HSC4558 Exam 3) | University of Central Florida
1. A patient presents with sudden oliguria and a significant drop in blood pressure following
major surgery. Which mechanism best describes the pathophysiology of their acute kidney
injury?
A. Inflammation of the glomerular basement membrane
B. Obstruction of urine outflow in the ureters
C. Direct toxic injury to the tubular epithelial cells
D. Decreased renal perfusion without damage to the parenchymal tissue
Answer: D
Explanation: Prerenal acute kidney injury occurs when blood flow to the kidneys is
compromised, often due to hypovolemia or hypotension. This reduction in perfusion leads
to a decrease in the glomerular filtration rate despite the kidney tissue initially remaining
functional. If systemic circulation is restored promptly, renal function typically returns to
baseline without permanent damage.
2. Which clinical finding is pathognomonic for nephrotic syndrome rather than nephritic
syndrome?
A. Hematuria with red blood cell casts
B. Hypertension due to fluid retention
C. Elevated serum creatinine and BUN levels
D. Proteinuria exceeding 3.5 grams per 24 hours
Answer: D
Explanation: Nephrotic syndrome is primarily characterized by massive proteinuria
caused by increased permeability of the glomerular capillary wall. This loss of protein leads
to hypoalbuminemia, which subsequently causes generalized edema and hyperlipidemia. In
contrast, nephritic syndrome is more associated with inflammatory lesions, hematuria, and
varying degrees of hypertension.
3. A 45-year-old male with chronic kidney disease (CKD) reports feeling excessively tired and
short of breath. Which hormonal deficiency is the most likely cause?
A. Erythropoietin
B. Calcitriol
C. Renin
,D. Aldosterone
Answer: A
Explanation: The kidneys are the primary site for the production of erythropoietin, which
stimulates the bone marrow to produce red blood cells. As CKD progresses, the loss of
functional renal mass results in decreased erythropoietin synthesis, leading to normocytic
anemia. This condition significantly contributes to the fatigue and reduced exercise
tolerance observed in patients with advanced renal failure.
4. In the context of the Renin-Angiotensin-Aldosterone System (RAAS), what is the primary
role of Angiotensin II?
A. Inhibiting the release of antidiuretic hormone
B. Promoting the excretion of sodium in the distal tubule
C. Potent vasoconstriction and stimulation of aldosterone secretion
D. Decreasing systemic vascular resistance to lower blood pressure
Answer: C
Explanation: Angiotensin II acts as a powerful vasoconstrictor that increases systemic
vascular resistance and arterial blood pressure. It also stimulates the adrenal cortex to
release aldosterone, which promotes sodium and water reabsorption in the kidneys. These
combined actions serve to maintain blood pressure and fluid balance in response to
decreased renal perfusion.
5. Which condition is characterized by the presence of white blood cell casts in a urinalysis?
A. Pyelonephritis
B. Nephrolithiasis
C. Cystitis
D. Benign Prostatic Hyperplasia
Answer: A
Explanation: Pyelonephritis is an infection of the renal pelvis and interstitium, typically
ascending from the lower urinary tract. The presence of white blood cell casts in the urine
is a hallmark sign indicating that the inflammation is occurring within the kidney tubules.
This distinguishes upper urinary tract infections from lower ones like cystitis, where casts
are typically absent.
6. Which pathophysiological process occurs in the ‘initiation phase’ of Acute Tubular Necrosis
(ATN)?
A. Restoration of the tubular basement membrane
B. Diuresis following the recovery of GFR
, C. Reduced oxygen delivery leading to sublethal cell injury
D. Significant accumulation of nitrogenous wastes in the blood
Answer: C
Explanation: The initiation phase of ATN involves the initial renal insult, such as ischemia
or exposure to nephrotoxins. During this stage, ATP depletion occurs within the tubular
cells, leading to cellular swelling and dysfunction. Timely intervention during this phase
can sometimes prevent the transition to the more severe maintenance phase.
7. A patient with syndrome of inappropriate antidiuretic hormone (SIADH) is most likely to
exhibit which electrolyte abnormality?
A. Hyponatremia
B. Hypercalcemia
C. Hypokalemia
D. Hypermagnesemia
Answer: A
Explanation: SIADH leads to the excessive secretion of ADH, causing the kidneys to
reabsorb water regardless of serum osmolality. This excess water retention dilutes the
concentration of sodium in the blood, resulting in dilutional hyponatremia. Patients may
present with neurological symptoms ranging from confusion to seizures depending on the
severity and speed of sodium decline.
8. What is the primary etiology of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
C. Excessive glucagon secretion from alpha cells
D. Chronic obesity leading to metabolic syndrome
Answer: B
Explanation: Type 1 Diabetes is an autoimmune disorder where T-cells attack and destroy
the insulin-producing beta cells in the Islets of Langerhans. This leads to an absolute
deficiency of insulin, making the patient dependent on exogenous insulin for survival. It is
typically diagnosed in childhood or adolescence but can occur at any age.
9. Which hormone is excessively produced in Cushing’s Disease?
A. Growth Hormone
C. Epinephrine
B. Thyroid Stimulating Hormone
Rationale (HSC4558 Exam 3) | University of Central Florida
1. A patient presents with sudden oliguria and a significant drop in blood pressure following
major surgery. Which mechanism best describes the pathophysiology of their acute kidney
injury?
A. Inflammation of the glomerular basement membrane
B. Obstruction of urine outflow in the ureters
C. Direct toxic injury to the tubular epithelial cells
D. Decreased renal perfusion without damage to the parenchymal tissue
Answer: D
Explanation: Prerenal acute kidney injury occurs when blood flow to the kidneys is
compromised, often due to hypovolemia or hypotension. This reduction in perfusion leads
to a decrease in the glomerular filtration rate despite the kidney tissue initially remaining
functional. If systemic circulation is restored promptly, renal function typically returns to
baseline without permanent damage.
2. Which clinical finding is pathognomonic for nephrotic syndrome rather than nephritic
syndrome?
A. Hematuria with red blood cell casts
B. Hypertension due to fluid retention
C. Elevated serum creatinine and BUN levels
D. Proteinuria exceeding 3.5 grams per 24 hours
Answer: D
Explanation: Nephrotic syndrome is primarily characterized by massive proteinuria
caused by increased permeability of the glomerular capillary wall. This loss of protein leads
to hypoalbuminemia, which subsequently causes generalized edema and hyperlipidemia. In
contrast, nephritic syndrome is more associated with inflammatory lesions, hematuria, and
varying degrees of hypertension.
3. A 45-year-old male with chronic kidney disease (CKD) reports feeling excessively tired and
short of breath. Which hormonal deficiency is the most likely cause?
A. Erythropoietin
B. Calcitriol
C. Renin
,D. Aldosterone
Answer: A
Explanation: The kidneys are the primary site for the production of erythropoietin, which
stimulates the bone marrow to produce red blood cells. As CKD progresses, the loss of
functional renal mass results in decreased erythropoietin synthesis, leading to normocytic
anemia. This condition significantly contributes to the fatigue and reduced exercise
tolerance observed in patients with advanced renal failure.
4. In the context of the Renin-Angiotensin-Aldosterone System (RAAS), what is the primary
role of Angiotensin II?
A. Inhibiting the release of antidiuretic hormone
B. Promoting the excretion of sodium in the distal tubule
C. Potent vasoconstriction and stimulation of aldosterone secretion
D. Decreasing systemic vascular resistance to lower blood pressure
Answer: C
Explanation: Angiotensin II acts as a powerful vasoconstrictor that increases systemic
vascular resistance and arterial blood pressure. It also stimulates the adrenal cortex to
release aldosterone, which promotes sodium and water reabsorption in the kidneys. These
combined actions serve to maintain blood pressure and fluid balance in response to
decreased renal perfusion.
5. Which condition is characterized by the presence of white blood cell casts in a urinalysis?
A. Pyelonephritis
B. Nephrolithiasis
C. Cystitis
D. Benign Prostatic Hyperplasia
Answer: A
Explanation: Pyelonephritis is an infection of the renal pelvis and interstitium, typically
ascending from the lower urinary tract. The presence of white blood cell casts in the urine
is a hallmark sign indicating that the inflammation is occurring within the kidney tubules.
This distinguishes upper urinary tract infections from lower ones like cystitis, where casts
are typically absent.
6. Which pathophysiological process occurs in the ‘initiation phase’ of Acute Tubular Necrosis
(ATN)?
A. Restoration of the tubular basement membrane
B. Diuresis following the recovery of GFR
, C. Reduced oxygen delivery leading to sublethal cell injury
D. Significant accumulation of nitrogenous wastes in the blood
Answer: C
Explanation: The initiation phase of ATN involves the initial renal insult, such as ischemia
or exposure to nephrotoxins. During this stage, ATP depletion occurs within the tubular
cells, leading to cellular swelling and dysfunction. Timely intervention during this phase
can sometimes prevent the transition to the more severe maintenance phase.
7. A patient with syndrome of inappropriate antidiuretic hormone (SIADH) is most likely to
exhibit which electrolyte abnormality?
A. Hyponatremia
B. Hypercalcemia
C. Hypokalemia
D. Hypermagnesemia
Answer: A
Explanation: SIADH leads to the excessive secretion of ADH, causing the kidneys to
reabsorb water regardless of serum osmolality. This excess water retention dilutes the
concentration of sodium in the blood, resulting in dilutional hyponatremia. Patients may
present with neurological symptoms ranging from confusion to seizures depending on the
severity and speed of sodium decline.
8. What is the primary etiology of Type 1 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
C. Excessive glucagon secretion from alpha cells
D. Chronic obesity leading to metabolic syndrome
Answer: B
Explanation: Type 1 Diabetes is an autoimmune disorder where T-cells attack and destroy
the insulin-producing beta cells in the Islets of Langerhans. This leads to an absolute
deficiency of insulin, making the patient dependent on exogenous insulin for survival. It is
typically diagnosed in childhood or adolescence but can occur at any age.
9. Which hormone is excessively produced in Cushing’s Disease?
A. Growth Hormone
C. Epinephrine
B. Thyroid Stimulating Hormone
