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I Introduction The intracellular processes of animals require that a relatively stable concentration of water be maintained This task is not an easy one because the cells of animals are surrounded by permeable membranes which allow the passage of water readily To maintain stable concentrations animals exchange ions and water between the intracellular fluid extracellular fluid blood plasma and environment Maintaining adequate internal water concentrations is done by a variety of mechanisms which are highly variable depending upon the organism These mechanisms appear to have evolved to suit the organism to the specific environment in which it lives If the organism is removed from this environment water loss or gain may be extremely detrimental This study utilized two animals the California Newt Taricha torosa and the Fence Lizard Sceloporus occidentalis in an attempt to better understand the effects of osmotic change due to environments T torosa is a semi-terrestrial amphibian and like all amphibians respires through the integument In a fresh water aquatic environment this is advantageous for oxygen uptake as well as for maintaning an adequate internal fluid osmolarity In the terrestrial environment this quality becomes a detriment due to the permeability of the integument to water To prevent excessive water loss some amphibians have been shown to utilize hormonal controls such as ADH to uptake environmental water and to reabsorb urinary water Gans 1951 To do so requires water to be in abundance either internally or in the surrounding environment In many terrestrial environments this may not be possible When water is unavailable excessive dehydration may occur affecting various body systems This study tests the relationship between water availability and dehydration by measuring the loss of body mass over time in wet moist and dry environments In contrast to amphibians reptiles are primarily terrestrial Their outer body consists of a keratinized epithelium with scales that are far less permeable to water than the amphibians Despite some water is still lost and
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