Question

Human urine contains

• A. 95% water, 2.6% urea, 2% salts and some uric acid
• B. 99% water and 1% urea
• C. 92% water and 8% salts
• D. 90% water, 8% uric acid and 2% proteins

Answer 1

Answer: (A)

Urine is a liquid produced by the kidneys to remove waste products from the bloodstream. Human urine is transparent, yellowish in colour and variable in chemical composition. It consists primarily of water $(95\%)$, with organic solutes including urea $(2.6\%)$, creatinine, uric acid, and trace amounts of enzymes, carbohydrates, hormones, fatty acids, pigments, and mucins, and inorganic ions such as sodium (Na ${}^{+}$), potassium ( $K^{+})$, chloride ( $C{l}^{-}$), magnesium ( $M{g}^{2+}$ ), calcium (Ca ${}^{2+}$ ), ammonium ( $N{H}_4^{+}$), sulfates ( $S{O}_4^{2-}$ ), and phosphates ( $P{O}_4^{3-}$ ).