(I) Water is of such great importance that it makes up
almost two thirds of the human body by weight. (II) It
plays a fundamental role in digestion and absorption
and in the elimination of indigestible metabolic waste.
(III) Water for the body is obtained primarily by drinking
and ingesting food as well as through internal chemical
reactions. (IV) Water also serves as the basis of the
circulatory system, which uses blood to distribute
nutrients to the entire body. (V) Moreover, water helps
maintain body temperature by expelling excess heat
through the skin via sweat and evaporation.