Urine is a liquid waste by-product of the body that the kidneys have secreted into a process called urination and excreted via the urethra. The normal chemical composition of urine is primarily water content, but it also involves nitrogenous molecules such as urea, as well as creatinine and other components of metabolic waste. Other substances may be excreted in urine as a result of injury or kidney glomeruli infection, which can alter the nephron ‘s ability to reabsorb or filter the various components of blood plasma.
Urine is an aqueous solution with water content greater than 95 per cent, with a minimum of these remaining constituents in order to reduce concentration:
- 9.3 g / L urea.
- 1.87 g / L chloride.
- 1.17 g / L sodium.
- 0.750 g / L potassium
- 0.670 g / L of creatinine
- Additional dissolved ions, organic and inorganic compounds such as metabolites, proteins, hormones.