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CBSE Class 10 Answered

How urine formation is done by the kidneys? 
Asked by Rajeev | 18 Sep, 2018, 10:31: AM
answered-by-expert Expert Answer
The mechanism of urine formation takes place in following steps-
(i) Ultrafiltration- All the blood components are filtered by the kidneys except for the blood cells and the plasma proteins, e.g. urea, water, sodium, glucose, potassium,etc.
(ii) Selective reabsorption- The essential components are reabsorbed back into the blood vessels, e.g. glucose, water, sodium, etc.
(iii) Secretion- The movement of elements such as water, glucose, amino acids, urea etc from the blood into the nephron is known as secretion. For example, potassium ions and hydrogen ions are secreted by distal convoluted tubule (DCT) and uric acid and other toxic chemicals secreted by proximal convoluted tubule (PCT)
(iv) Then the water reabsorption content is further regulated before coming out of the kidney through a hormone, anti-diuretic hormone (ADH).
(v) Urine is then formed, collected in the bladder and excreted outside the body.
Answered by Sivanand Patnaik | 18 Sep, 2018, 12:17: PM

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