http://en.wikipedia.org/wiki/Human_body
The average adult body contains between 5 and 5½ litres of blood and approximately 10 litres of interstitial fluid.
The composition of the human body can be referred to in terms of its water content, elements content, tissue types or material types. The adult human body contains approximately 60% water, and so makes up a significant proportion of the body, both in terms of weight and volume. Water content can vary from a high 75% in a newborn infant to a lower 45% in an obese person.
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