1. Water :95% of urine .
2. Urea ,creatinine and uric acid : waste product of amino acid metabolism .
3. Potassium (K) :must not kept inside the body .
4. Small amount of amino acid .
5. Free H+ ion and acid :product from (C.H.O) and fat metabolism .
6. Urobilinogen :in small amount .
7. Phosphate .
8. Sodium (Na) :must be kept inside body, deffernt ions in urine independant on degree of tubular reabsorption and secreation requried to maintain electrostatic equilibrim .