how is urine formed

Urine Formation involves 3 basic steps:

  • Glomerular filtration

  • Re-absorption

  • Secretion

All the above three steps have been explained very well in our study material. Kindly go through it at the following link and if you find any problem then do get back to us.!!/8a@Ns2CmUHmgrJK5HHrS3Q!!

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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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  • Filtration involves the transfer of soluble components such as water and waste from the blood into the glomerulus.

  • Reabsorption involves the absorption of molecules, ions, and water that are necessary for the body to maintain homeostasis from the glomerular filtrate back into the blood.

  • Secretion involves the transfer of hydrogen ions, creatinine, and drugs from the blood into the collecting duct.


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