osmoregulation student s08

osmoregulation student s08 - ions by gills Excretion of...

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1.Osmoconformers 2.Freshwater Osmoregulation 3.Saltwater Osmoregulation 4.Terrestrial Osmoregulation Excretion and osmoregulation The control of the gain and loss of water and dissolved solutes Disposal of metabolic wastes
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Osmoconformers (Jellies, scallops, lobsters, and most marine invertebrates) Body fluids with solute concentration equal to that of salt water No energy needed to regulate water content But have to live in the sea Lima sea star Some animals don’t need to osmoregulate… Most animals are Osmoregulators (All land animals, most marine vertebrates) Body fluids with solute concentration different from that of their environment Must use energy to control water loss or gain Many possible environments
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Freshwater osmoregulators Uptake of water and some ions in food Osmotic water gain through gills and other parts of the body surface Uptake of salt
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Unformatted text preview: ions by gills Excretion of large amounts of water in dilute urine from kidneys Three organ systems needed to achieve proper balance of solutes and water: See Figure 49.3 Saltwater osmoregulators Box Fish Gain of water & salt ions from food and by drinking seawater Osmotic water loss through gills and other parts of body surface Excretion of salt ions through gills Excretion of salt ions and small amounts of water in scanty urine from kidneys See Figure 49.3 Maintaining water balance on land Adaptations for survival – Kidneys – Surface coverings to prevent water loss • Feathers, scales, skin, fur, shells – Behaviors • Nocturnal, burrowing, taking in water The threat of desiccation always looms…. . Despite these adaptations, terrestrial animals lose much water – mostly from gas exchange surfaces and in urine...
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