Lecture 8-1201

Lecture 8-1201 - Lecture8 14:11 Diffusion

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Lecture 8 14:11 Diffusion Movement of molecules down a concentration gradient Fig 7.15 Fig 7.11 Fig 7.17 Osmosis Diffusion of water From higher (fewer solutes) water potential to lower water potential Fig 7.12 Problems confronting organisms What if the concentration of solutes differs between the intracellular  compartment and the environment? Hypertonic Lower water potential More solutes dissolved Hypertonic solutions will tend to gain water Hypotonic Higher water potential Fewer solutes dissolved
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Hypotonic solutions will tend to lose water Isotonic Equivalent water potential  Equivalent number of solutes dissolved Isotonic solutions have no net movement of water Fig 7.13 Ex-Marine invertebrates Isotonic with sea water Accumulate free amino acids to match the tonicity of seawater  Ex-Marine elasmobranch fishes Sharks and rays Isotonic with seawater Accumulate up to 0.5M urea Ex-Freshwater bony fish (teleost fish) Hypertonic to freshwater
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This note was uploaded on 08/22/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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Lecture 8-1201 - Lecture8 14:11 Diffusion

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