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Unformatted text preview: 1 Excretory Systems, Osmoregulation, Salts & Water Balance 8/1/08 Fri Diffusion & Osmosis Diffusion-Solutes move from areas of higher concentration to areas of lower concentration, solute cross their barriers (tends to equalize concentration in a system) Osmosis- water moves from areas of higher concentration to areas of lower concentration, when solutes can’t move across barrier (must expend energy to maintain the osmotic gradients that cause water in/out) Affects water/ solute balance in body tissue Osmoregulation The process of regulating the concentration of solutes and water in the body Over time, the loss and uptake of water must balance = homeostasis Osmolarity-total solute concentration of a solution Hypo osmotic – a solution has a relatively lower solute concentration Hyper osomotic- a solution has a relatively higher solute concentration Iso osmotic- both solution has same osmolarity, no net movement of water by osmosis Body water-Metabolism Water is Major portion of an animal’s body mass Solvent for chemical reaction Transport vehicle Dehydration compromises the circulatory system and regulation of body temperature Too much water can endanger/kill you Generated as a by-product of ATP production- metabolic water Some animals rely on this for all or nearly all of their water requirements In other animals, this water is excess that must be eliminated Electrolytes Salts dissociate in solution into charged ions =electrolytes 2...
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- Summer '08
- higher solute concentration, loop of Henle, Osmolaritytotal solute concentration, solute concentration Hyperosomotic