Same chapter3 marksDifficulty: Medium
Why is the kidney called an osmoregulatory organ as well as an excretory organ?
Excretory System
3 marksDifficulty: Medium
Describe the three steps in the formation of urine.
Original Khojo Papers practice question — not from a past board paper.
Answer
In ultrafiltration, blood in the glomerulus is filtered under pressure into the Bowman's capsule, and everything except blood cells and large proteins passes through. In selective reabsorption, the useful substances — glucose, most of the water, amino acids and some salts — are taken back into the blood from the tubule. In tubular secretion, extra wastes and excess ions are passed from the blood into the tubule.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
What remains in the collecting duct is urine.
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Glucose is normally absent from urine because it is:
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