s18 - Osmoregulation Osmoregulation Re g ula tio n o f c e...

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Unformatted text preview: Osmoregulation Osmoregulation Re g ula tio n o f c e llula r o r who le -b o dy s a lt a nd wa te r c o nte nt O s m o s is vs . diffus io n Is o to nic , hype rto nic , hypo to nic Aq ua tic s pe c ie s : Inve rts a re is o to nic ~ 500 m M Na C l + o the r s a lts ~ 1050 m O s m FW ve rte b ra te s (fis he s ) e vo lve d fro m m a rine inve rts Pro b le m s : O s m o tic g a in o f wa te r Diffus io na l lo s s o f Na C l S o lutio ns : Re duc e b lo o d Na C l c o nc e ntra tio n Inc re a s e urine flo w De c re a s e urine Na C l c o nc e ntra tio n Extra c t Na C l fro m o uts ide wa te r--a c tive Osmoregulation Osmoregulation Regulation of cellular or whole-body salt and water content Osmosis vs. diffusion Isotonic, hypertonic, hypotonic Aquatic species: Inverts are isotonic ~ 500 mM NaCl + other salts ~ 1050 mOsm FW vertebrates (fishes) evolved from marine inverts Problems: Osmotic gain of water Diffusional loss of NaCl Solutions: Reduce blood NaCl concentration Increase urine flow Decrease urine NaCl concentration Extract NaCl from outside water--active Osmoregulation Osmoregulation Regulation of cellular or whole-body salt and water content Osmosis vs. diffusion Isotonic, hypertonic, hypotonic Aquatic species: SW vertebrates—evolved from FW ancestors Osmoregulation Osmoregulation Regulation of cellular or whole-body salt and water content Osmosis vs. diffusion Isotonic, hypertonic, hypotonic Aquatic species: SW vertebrates—evolved from FW ancestors Problems: Fish ~ 300 mOsm vs. SW is 1050 mOsm Osmoregulation Osmoregulation Regulation of cellular or whole-body salt and water content Osmosis vs. diffusion Isotonic, hypertonic, hypotonic Aquatic species: SW vertebrates—evolved from FW ancestors Problems: Osmotic loss of water Osmoregulation Osmoregulation Re g ula tio n o f c e llula r o r who le -b o dy s a lt a nd wa te r c o nte nt O s m o s is vs . diffus io n Is o to nic , hype rto nic , hypo to nic Aq ua tic s pe c ie s : S W ve rte b ra te s —e vo lve d fro m FW a nc e s to rs Pro b le m s : O s m o tic lo s s o f wa te r Diffus io na l g a in o f Na C l Osmoregulation Osmoregulation Re g ula tio n o f c e llula r o r who le -b o dy s a lt a nd wa te r c o nte nt O s m o s is vs . diffus io n Is o to nic , hype rto nic , hypo to nic Aq ua tic s pe c ie s : S W ve rte b ra te s —e vo lve d fro m FW a nc e s to rs Pro b le m s : O s m o tic lo s s o f wa te r Diffus io na l g a in o f Na C l S o lutio ns : ( b o ny fis he s —te le o s ts ) Osmoregulation Osmoregulation Re g ula tio n o f c e llula r o r who le -b o dy s a lt a nd wa te r c o nte nt O s m o s is vs . diffus io n Is o to nic , hype rto nic , hypo to nic Aq ua tic s pe c ie s :...
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This note was uploaded on 02/10/2011 for the course BSC 2011 taught by Professor Haas during the Spring '08 term at University of Florida.

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s18 - Osmoregulation Osmoregulation Re g ula tio n o f c e...

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