Renal system – the kidneys regulate electrolytes, salt, water and blood pressure, and get rid of other waste products from the body. This is why we are often told to drink plenty of water to flush out toxins from the body. The need to drink 8 glasses of pure water a day is apparently a myth, but it isn’t good to be dehydrated and there don’t seem to be any negative side affects from drinking eight glasses of water a day.
If the kidneys aren’t working properly we need to undergo dialysis treatment to filter the blood or we will soon die. Each kidney contains about 1 million nephrons for filtering the blood, and each day the kidneys filter about 200 litres of blood whilst removing about 2 litres of waste and water. Sometimes these toxins can form small stones (often of Uric acid) which can get stuck in the ureter and cause pain when we try to excrete them.