Animal body water content varies with age of the animal. The older the vertebrate animal, the higher its relative bone mass and the lower its body water content. Functions Water in the animal body performs a number of functions: *solvent for transportation of nutrients * Intracellular fluid * Extracellular fluid ** Plasma ** Interstitial fluid ** Transcellular fluid *** Contained inside organs, such as the gastrointestinal, cerebrospinal, peritoneal, and ocular fluids. Adipose tissue contains about 10% of water, while muscle tissue contains about 75%. Intake An immediate way of adding water to a body is drinking. In addition, water enters the body with food, especially rich in water, such as plants, raw meat, etc. Of all animals, humans are most resourceful in ways of water intake.
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