define excretion how is urine formed and how is it excreted? what happen if it is not excreted
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The kidneys filter unwanted substances from the blood and produce urine to excrete them. There are three main steps of urine formation: glomerular filtration, reabsorption, and secretion. These processes ensure that only waste and excess water are removed from the body.
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Excretion is the removal of waste mainly urea with the help of urine by kidneys. Proteins are digested to form amino acids and the final by-product of the degradation of ammonia is urea. This urea containing blood (blood filtrate) is carried from the liver to the kidneys for its final excretion as urine.
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