The desert camel, like the goat, rapidly replaces lost water after being severely dehydrated. In contrast to the goat, however, the camel quickly absorbs water into its bloodstream, which allows for a rapid return to normal of its renal function. The GFR, renal plasma flow (RPF), and urine flow return to normal within ½ h of drinking. The urine becomes highly diluted in appearance as well. The changes in urea metabolism are probably associated with the decline in ADH concentrations. To prevent serious hemodilution, aldosterone secretion accounts for the slight drop in GFR and RPF 2 h following drinking. The camel has thus adapted to the desert not only by being able to withstand severe dehydration but also by being able to rapidly restore body functions, especially renal function.
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Etzion et al. (1986) studied this question.