Lecture8-2009W - Transport of Solutes and Water movement of...

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Transport of Solutes and Water Example 1 . A single cell b intra- & extracellular fluid, similar osmotic pressure but unequal ionic compositions Example 2 . Epithelial cells b e.g. fish outer gill memb. b concentrated blood plasma vs. diluted pond Example 3 . Intestinal epithelium b e.g. a bird or mammal. b dissolved molecules must cross the epithelium Common theme: Asymmetric distribution Passive and Active Transport Mechanisms 1. Equilibrium b 2 nd law of thermodynamics b a state of minimal capacity to do work b in the direction of decreasing work potential 2. Passive transport b capable of carrying materials only in the direction to equilibrium b no energy required 3. Active transport ± b capable of carrying materials in the direction opposing equilibrium b energy input required
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Passive transport: (A) Simple diffusion b D iffusion: concentration-dependent,veryslow Fick’s diffusion equation,
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Lecture8-2009W - Transport of Solutes and Water movement of...

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