how is urine formed

Asked by  | 19th Jun, 2008, 01:04: PM

Expert Answer:

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

i) Glomerular filtration - Filtration of blood under pressure in the glomerulus

ii) Selective Reabsorption - Useful substances from filtrate are reabsorbed by renal tubular cells and returned to blood.

iii) Tubular secretion - Separation of unwanted substances from blood and actively secreting them into the renal filtrate.

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

Answered by  | 19th Jun, 2008, 06:39: PM

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