urine is produced in the kidneys. the kidneys act as filters to the blood removing waste that accumulates in our bloodstreams. urine consits mostly of water, urea and ammonia. The body also releases white cells, bilirubin (red blood cells) , small amounts of protien, epithelial cells, Creatnine among other constituents. Urine high in protien can show deficinces within the workings of the kidneys whilst large amounts of bilirubin can show traces of liver disease. Luecocytes and nitrates which are byproducts of bacterial cell death can be a tell tall sigh of a urinary tract infection. A UTI affects more men than women as women have a urethra of only 4cm (the tube that carries urine from the bladder to the outside) and males have a urethra of up to 20cm. Urine is not produced as you urinate it is actually made in the kidneys then excreted via the ureters into the bladder. The average volume of a human bladder can be around 300mls, at that point you will feel like you need to visit the loo.