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How is urine formed?Briefly explain it.

Urine is formed through three processes that occur in the kidney:

 

  • Ultrafiltration, where almost 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.
  • Selective reabsorption, where the essential components are reabsorbed back into the blood vessels, e.g. glucose, water, sodium, ...etc.
  • Secretion, where, e.g. potassium is secreted by cells in exchange for another useful component, e.g. sodium in that case.
  • Then the water reabosprtion content is further regulated before exiting the kidney through a hormone known as ADH.
  • Urine is then formed, collected in the bladder and excreted outside the body later on

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Urine formation is a lendy process actually. But in simple language, the undigested food from the large intestine, comes to the kidney. Here in the nephron part of the kidney, the undigested food along with the blood is transported through renal artey, through afferent arteriole to the glomerules where it is getting filtrate. The filtrate blood along with the food is passed towards the bowman 's capsule. Here 99% useful ubstance like glucose, salts are absorbed. From here the blood is transported to the secretory tubules which secrets the blood and made it pass through the renal vein, from where it goes to different parts of the body.

 

Now, again the absorbed materials by the secretory tubules are urea and uric acid. This substances are then secreted by the tubular secretion, which is allowed to paas through the urinary bladder and it is passed thorugh as urine. The passing out of fluid urine is also called as micturition.

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