Percentage of body weight that is water: Premature infant
90%
Percentage of body weight that is water: Newborn
70- 80%
Percentage of body weight that is water: 12 years to adult
50- 60%
Percentage of body weight that is water: Older adults
45- 55%
Functions of Fluid ( Water )
Lubricant for tissues
Provides an extracellular transportation route to deliver nutrients to the cells to carry waste product from the cells
Assists in heat regulation via evaporation
Aids in maintenance of acid- base balance
Provides a medium in which chemical reactions, or metabolism, can occur within the cell