Urine Facts

  • Urine is one of your body’s ways of getting rid of waste.
  • Your kidneys produce urine, filtering it from your blood.
  • Urine runs from each kidney down a long tube called the ureter, to a bag called the bladder.
  • Your bladder fills up with urine over several hours. When it is full, you feel the need to urinate.
  • Urine is mostly made up of water, but there are several substances dissolved in it. These include urea, various salts, creatinine, ammonia and blood wastes.
  • Urea is a substance that is left after the breakdown of amino acids.
  • Urine gets its smell from substances such as ammonia.
  • Urine gets its color from a yellowish blood waste called urochrome. Urochrome is left after proteins are broken down.
  • If you sweat a lot — perhaps during a fever — your kidneys will let less water go and your urine will be stronger in color.