Kidney Essentials
Medium-difficulty multiple-choice quiz testing core concepts about kidney function, regulation, and clinical implications.
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Quiz Questions & Answers
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Question 1: What is the primary functional unit of the kidney responsible for filtering blood and forming urine?
Nephron
Renal pelvis
Medulla
Collecting duct
Question 2: Which process primarily determines how freely a small unbound solute passes from glomerular capillary blood into Bowman's space?
Collecting duct osmoregulation
Glomerular filtration (size and charge selectivity)
Glomerular active transport
Tubular secretion in proximal tubule
Question 3: A patient has decreased renal perfusion but intact glomeruli. Which immediate renal response helps preserve GFR?
Long-term nephron hypertrophy to boost filtration
Increased sodium excretion to lower plasma osmolarity
Afferent arteriole dilation and efferent arteriole constriction mediated by autoregulation and angiotensin II
Increased ADH causing immediate increased filtration
Question 4: Which statement best describes the kidney's role in acid–base balance?
Kidneys reabsorb bicarbonate and generate new bicarbonate while excreting titratable acid and ammonium
Kidneys increase plasma CO2 to correct alkalosis
Kidneys only filter bicarbonate but do not generate new bicarbonate
Renal function is negligible compared with lungs for acid elimination
Question 5: Which clinical sign most directly suggests reduced glomerular filtration rather than pure tubular dysfunction?
Hematuria with stable renal function
Impaired urine concentration with normal creatinine
Rapid rise in serum creatinine
Isolated tubular proteinuria with preserved GFR
Question 6: How does aldosterone primarily affect renal handling of sodium and potassium?
Only affects water channels without altering electrolytes
Promotes bicarbonate secretion in the proximal tubule
Increases sodium reabsorption and promotes potassium secretion in cortical collecting ducts
Decreases sodium reabsorption while increasing potassium reabsorption
Question 7: Which statement corrects a common misconception about kidney disease progression?
High fluid intake alone prevents chronic kidney disease
Mild chronic kidney disease can be slowed by controlling blood pressure and proteinuria
Kidney function loss is entirely reversible with diet changes
Once kidney damage starts it always leads quickly to dialysis
Question 8: In a patient with suspected pre-renal azotemia, which laboratory pattern supports reduced renal perfusion rather than intrinsic renal damage?
High BUN-to-creatinine ratio and low fractional excretion of sodium
High urine osmolality with high fractional excretion of sodium
Low BUN-to-creatinine ratio with high urine sodium
Persistent glucosuria with normal electrolytes