Discuss the composition of urine.

Composition of urine :

Nature : Urine is acidic in nature and its pH varies between 4.5 to 8.0.

Colour : Urine is pale yellow due to the presence of urochrome, a pigment.

Odour : Urine has a faint odour due to bad smelling urinod. On standing, urea changes to ammonia and produces a strong offensive pungent smell.

Quantity : A normal adult excretes about 1 to 1.8 litre of urine in 24 hours.

Chemical composition : An analysis of urine shows that urine contains 95% water, 5% nitrogenous metabolic waste products like urea, hippuric acid, creatinine etc. and non-nitrogenous waste products like oxalic acid, excess of vitamin etc.