Week 8, Lecture 3, Osmoexcrthermo

Week 8, Lecture 3, Osmoexcrthermo - Osmoregulation,...

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Homeostasis - maintenance of constant conditions Osmoregulation - control of internal bodily fluids Excretion - control of nitrogenous wastes, metabolites Thermoregulation - control of internal body temperature Osmoregulation, Excretion, Thermoregulation Terms Hypo = “less than…” Hyper = “more than…” Iso = “same as…” osmotic ~ tonic Ionic and Osmotic regulation Na + Cl - K + Osmolarity ( mOsm) Fresh water 0.4 0.2 0.02 1 Sea water 475 107 10 1000 Squid ( sw) 456 110 22 1000 Salmon ( fw) 181 157 2 340 Salmon ( sw) 212 170 4 400 Shark ( sw) 269 258 4.3 1075 Human 144 107 5 281 Who’s doing what? where? how? Contractile vacuoles - large SA/V - freshwater forms (Amoeba) -excesswaterp lusNH 3 + Rate Salinity Specialty structures Chloride cells in gills of bony fish - active transport of NaCl - captures extra NaCl in freshwater - releases extra NaCl in sea water Fig 43.12 Specialty structures Nasal glands of marine birds and reptiles - collect excess salt - released through nostrils at 2000 mOsm/L - allows drinking of sea water ( : ) humans 250 mOsm ( : )
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Specialty structures Rectal glands of sharks - active transport of NaCl out of intestine - hyperosmotic to sea water (1,080 mOsm)
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This note was uploaded on 04/18/2010 for the course BIOLOGY 1223 taught by Professor Gardiner/lajoie during the Fall '09 term at UWO.

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Week 8, Lecture 3, Osmoexcrthermo - Osmoregulation,...

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