KMU Past Paper Practice
MCQ 1
A contrast study demonstrates normal passage of urine from the renal papilla toward the ureter. Which sequence correctly represents the normal collecting pathway immediately after urine leaves the renal papilla?
Options:
Minor calyx → major calyx → renal pelvis
Urine leaving a renal papilla enters a minor calyx, then a major calyx and finally the renal pelvis before passing into the ureter.
MCQ 2
During renal histology, a student identifies renal corpuscles and numerous convoluted tubules but no renal pyramids. From which region was the tissue most likely obtained?
Options:
Renal cortex
Renal corpuscles are located in the cortex. The medulla contains pyramids and straight tubular segments but lacks renal corpuscles.
MCQ 3
A 36-year-old woman has recurrent ascending urinary infections despite having no structural urinary tract abnormality. Which anatomical feature contributes most directly to the increased susceptibility of the female lower urinary tract to ascending infection?
Options:
Shorter urethral length
The short female urethra provides a shorter route for organisms to ascend from the external urethral region into the bladder.
MCQ 4
A glomerular disorder damages podocyte foot processes and the glomerular basement membrane. Which urinary abnormality is most directly expected from loss of the normal filtration-barrier function?
Options:
Increased urinary protein excretion
The glomerular filtration barrier normally restricts plasma proteins. Damage to the basement membrane or podocytes increases protein passage into urine.
MCQ 5
A patient develops marked hypoalbuminemia from a non-renal condition. If other determinants remain unchanged, which change would be expected at the glomerulus?
Options:
Increase in net filtration tendency
Lower plasma protein concentration reduces glomerular capillary oncotic pressure, removing one of the forces that normally opposes filtration.
MCQ 6
Tubular fluid enters the descending limb of the loop of Henle and travels deeper into the renal medulla. Which transport property is most important at this segment?
Options:
High permeability to water
The descending limb allows water to leave tubular fluid as it passes through the hyperosmotic medulla, helping concentrate the tubular contents.
MCQ 7
A hormone acts on the distal nephron to increase sodium reabsorption while enhancing potassium secretion. Which hormone produces this combined effect?
Options:
Aldosterone
Aldosterone promotes distal sodium reabsorption and potassium secretion, helping regulate extracellular volume and potassium balance.
MCQ 8
The medullary osmotic gradient has been established normally, but blood flowing through the renal medulla rapidly washes it away. Dysfunction of which structure would best explain this problem?
Options:
Vasa recta
The vasa recta act as countercurrent exchangers and preserve the medullary concentration gradient rather than washing it out.
MCQ 9
A patient is hyperventilating because of a primary respiratory disorder. Blood pH is increased and arterial carbon dioxide is reduced. Which renal response would help compensate if the disturbance persists?
Options:
Increased bicarbonate excretion
Persistent respiratory alkalosis is compensated by the kidneys reducing bicarbonate retention, which lowers plasma bicarbonate and moves pH toward normal.
MCQ 10
A patient with severe diarrhea develops a primary reduction in plasma bicarbonate and acidemia. Which immediate physiological response is expected before renal compensation becomes fully effective?
Options:
Increased alveolar ventilation
Metabolic acidosis triggers compensatory hyperventilation, lowering arterial CO₂ and thereby reducing the fall in blood pH.
MCQ 11
A patient with irreversible advanced kidney failure can no longer maintain fluid, electrolyte and metabolic homeostasis without renal replacement therapy. Which term most appropriately describes this stage?
Options:
End-stage renal disease
ESRD represents advanced irreversible renal failure in which residual kidney function is insufficient to maintain homeostasis without renal replacement therapy.
MCQ 12
A 64-year-old patient becomes hypotensive after acute blood loss. Several hours later, urine output falls and nitrogenous waste products begin to accumulate. Which renal process has most directly decreased?
Options:
Glomerular filtration
Marked reduction in renal perfusion lowers glomerular filtration, reducing waste clearance and contributing to oliguria and biochemical renal dysfunction.
MCQ 13
A urine specimen from a patient with suspected urinary inflammation shows a positive leukocyte esterase reaction. Which finding does this test most directly indicate?
Options:
White blood cells in urine
Leukocyte esterase is released by leukocytes, so a positive reaction supports pyuria and urinary tract inflammation or infection.
MCQ 14
A patient has intermittent urinary symptoms. Urinalysis repeatedly shows a specific gravity that changes very little despite major changes in fluid intake. Which renal property should be questioned?
Options:
Ability to vary urine concentration
Urine specific gravity reflects concentration. Failure to vary appropriately with hydration suggests impaired renal concentrating or diluting ability.
MCQ 15
A patient undergoing evaluation for possible systemic metabolic disease has ketones detected on urinalysis. Which process most directly accounts for this finding?
Options:
Increased fat metabolism
Ketonuria reflects increased production of ketone bodies during enhanced fat metabolism and may indicate a systemic metabolic disturbance rather than primary renal disease.
MCQ 16
A 24-hour urine collection is performed to calculate creatinine clearance, but the patient accidentally discards one urine sample during the collection period. What is the most likely consequence?
Options:
Calculated clearance becomes unreliable
Creatinine clearance depends on an accurate timed urine volume and urinary creatinine measurement. Missing urine causes a significant collection error.
MCQ 17
A patient with suspected urinary calculi undergoes imaging after initial assessment. The clinician wants detailed anatomical visualization of the urinary tract and reliable detection of calculi. Which modality is most appropriate for this purpose?
Options:
Computed tomography
CT provides excellent anatomical detail and is highly useful for detecting urinary calculi and assessing associated obstruction or other structural abnormalities.
MCQ 18
A contrast-based urinary study shows contrast appearing within the renal collecting system and then passing down the ureter. Which renal function must have occurred before the collecting system becomes opacified?
Options:
Filtration and excretion of contrast
Excretory contrast imaging depends on renal handling of contrast before it appears in the calyces, pelvis and ureters, linking function with anatomy.
MCQ 19
A patient with renal impairment has a serum sodium concentration of 140 mmol/L, potassium of 4.4 mmol/L, chloride of 103 mmol/L and bicarbonate of 14 mmol/L. Which result is clearly outside the typical adult reference range?
Options:
Serum bicarbonate
A bicarbonate concentration of 14 mmol/L is below the typical adult range of approximately 22–28 mmol/L and suggests a metabolic acid–base disturbance.
MCQ 20
A clinician is evaluating a patient with renal dysfunction. Serum creatinine and eGFR are abnormal, urinalysis shows protein, and imaging demonstrates a renal structural abnormality. Which principle best explains why these investigations should be interpreted together?
Options:
Each test assesses a different aspect of renal disease
Blood tests assess filtration and homeostasis, urinalysis helps characterize the disease process, and imaging evaluates renal and urinary tract structure.