CBSE Class 10 Answered

Urine is produced by the nephrons of kidneys. Urine formation takes place in 3 steps:

i) Glomerular filtration - Filtration of water and dissolved substances out of the blood in the glomeruli and into Bowman's capsule.

ii) Selective Reabsorption - Reabsorption of water and dissolved substances out of the kidney tubules back into the blood ( this process prevents substances needed by the body from being lost in the urine)

iii) Tubular secretion - Separation of unwanted substances from blood like hydrogen ions (H⁺), potassium ions (K⁺), ammonia (NH₃), and certain drugs,  and actively secreting them into the renal filtrate.

The concentrated urine is then taken to urinary bladder through ureters and stored there, until release.

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