Fitsari wani ruwa wanda by-product na metabolism dake jikin mutane da yawancin dabbobi. Fitsari na fitowa ne daga ƙoda yabi ta ureter zuwa mafitsara. Yin fitsara ke sakamakon fitar fitsari daga jiki. Wannan Muƙalar guntuwa ce: tana buƙatar a inganta ta, kuna iya gyara ta.