Asked by kartikeya.sharma | 8th Aug, 2009, 08:35: PM

Expert Answer:

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.


Kindly post each of the remaining queries as separate questions.

Answered by  | 10th Aug, 2009, 07:59: AM

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