The organs, tubes, muscles, and nerves that work together to create, store, and carry urine are the urinary system. The urinary system includes two kidneys, two ureters, the bladder, two sphincter muscles, and the urethra. Your body takes nutrients from food and uses them to maintain all bodily functions including energy and self-repair. After your body has taken what it needs from the food, waste products are left behind in the blood and in the bowel.
Adults eliminate about a quart and a half of urine each day.
The amount depends on many factors, the major ones being the amount of fluid and foods a person consumes and how much fluid is lost through sweat and breathing. Certain types of medications can also affect the amount of urine eliminated. The urinary system removes a type of waste called urea from your blood. Urea is produced when foods containing protein, such as meat, poultry, and certain vegetables, are broken down in the body. Urea is carried in the bloodstream to the kidneys.