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

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Transport of Solutes and Water movement of solutes & water across cell membrane (& epithelia) Example 1 . A single cell barb2right intra- & extracellular fluid, similar osmotic pressure but unequal ionic compositions Example 2 . Epithelial cells barb2right e.g. fish outer gill memb. barb2right concentrated blood plasma vs. diluted pond Example 3 . Intestinal epithelium barb2right e.g. a bird or mammal. barb2right dissolved molecules must cross the epithelium Common theme: Asymmetric distribution Passive and Active Transport Mechanisms 1. Equilibrium barb2right 2 nd law of thermodynamics barb2right a state of minimal capacity to do work barb2right in the direction of decreasing work potential 2. Passive transport barb2right capable of carrying materials only in the direction to equilibrium barb2right no energy required 3. Active transport barb2right capable of carrying materials in the direction opposing equilibrium barb2right energy input required
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Passive transport: (A) Simple diffusion barb2right D iffusion:
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