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Unformatted text preview: Water Balance 25/03/2008 18:09:00 Water and Temperature Endothermy in mammals o High specific heat o Evaporation cooling Sweating cools Also reduces hydration In aquatic animals o Difficult to have separate temperature because of waters specific heat Thick blubber Seals Whales Heat core Tuna o Increasingly difficult in water breathing organisms Rate of heat transfer is greater than oxygen transfer Water Important to life Pumps do not exist in cells o Water cannot be pumped against its concentration gradient by any biological system Water follows salt o Water and salt balance are linked o Movement is achieved by altering salts Sea water contains 3% salt o Urine maxes at expending 2% salt Salt balance Organisms want plasma of a different concentration of salt than water o Marine fish excrete salt o Freshwater fish take up salt o Gills used for salt balance o Anadromous fish Switch between salt and fresh environments Salmon...
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- Spring '08