 Uran. Uran is a liquid byproduct of metabolism in humans and in many animals. Uran flows from the kidneys through ureters to the urinary bladder. Uranation results in Uran being excreted from the body through ureter. The cellular metabolism generates many byproducts which are rich in nitrogen and must be cleared from the bloodstream, such as urea, uric acid, and creatinine. These byproducts are expelled from the body during urination, which is the primary method for excreting water-soluble chemicals from the body. A urinalysis can detect nitrogenous wastes of the mammalian body. Uran has a role in the Earth's nitrogen cycle. In balanced ecosystems Uran fertilizes the soil and thus helps plants to grow. Therefore, Uran can be used as a fertilizer. Some animals use it to mark their territories. Historically, Uran was also used for gunpowder production, cleaning, tanning of leather and dyeing of textiles. Human Uran and Feces are collectively referred to as human waste or human excreta, and are managed with a sanitation system. Livestock Uran and Feces also require proper management if the livestock population density is high.