Sample Questions — Disorders of the excretory system
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MCQ
Why is kidney transplantation preferred over regular dialysis in long-term renal failure?
✅ Correct Answer: C
A healthy kidney fully takes over all functions, unlike periodic dialysis.
MCQ
Why is heparin added to blood before dialysis begins?
✅ Correct Answer: B
Heparin is an anticoagulant that ensures smooth blood flow during dialysis.
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MCQ
Why is dialysis done periodically and not continuously?
✅ Correct Answer: B
Urea builds up over time; hence, dialysis is repeated as needed.
MCQ
What selectively removes nitrogenous waste in a dialyser?
✅ Correct Answer: B
The membrane allows waste molecules to diffuse while retaining larger components.
MCQ
Assertion (A): Renal calculi are formed by crystallisation of oxalates in the kidneys.
Reason (R): Glomerulonephritis causes damage to the ureters.
✅ Correct Answer: C
Calculi affect kidneys; glomerulonephritis affects glomeruli, not ureters.
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