The excretory system removes waste from the body through urine and feces. It includes the kidneys, ureters, urinary bladder, and urethra. The kidneys filter wastes from the bloodstream to produce urine, which contains urea and other toxins. The urine travels from the kidneys to the bladder through ureters, and is then excreted through the urethra. The excretory system works with the digestive system, removing waste products that are generated as food is broken down in the body.