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Renal processes

the three main renal processes which in combination produces urine?

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Urine generally consists of the three processes within the nephron:

a) Glomerular filtration,

b) Tubular resorption and

c) Tubular secretion.

In nephron, the blood which is carried by afferent arteriole enters the glomerular capillary network where it is filtered. The filtration which implies that part of the blood returns to the circulation through the efferent arteriole and the other part, which is known as glomerular filtrate, enters the proximal tubule of nephron. In nephron, tubules also known as convoluted tubules substances of the glomerular filtrate such as ions, water and small organic molecules are reabsorbed by the cells of tubule wall and gain again the circulation. These cells also release other substances within the tubules. Urine is made of not resorbed filtered substances and also of released substances. Urine is drained through collecting ducts to the ureter of every kidney, then it enters bladder and later it gets discharged through the urethra. The nephron tubules are generally surrounded by an extensive capillary network which collects resorbed substances and provides others to get secreted.

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