lecture0305audio - Diffusion UNCHARGED molecules Direction...

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Diffusion – UNCHARGED molecules Direction of net movement of  UNCHARGED solute across a cell  membrane by diffusion is always down  the solute’s concentration gradient. (net movement INTO cell)   = RT ln [C i ]/[C o ] [C i ]  - concentration of solute inside cell [C o ] – concentration of solute outside cell G is negative ONLY if [C i ] <[C o ] Note that if [C i ] > [C o ], then net movement  occurs out of cell since,  (net movement OUT OF  cell)  = -  (net movement INTO  cell)  
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Diffusion – CHARGED molecules Net movement of CHARGED solute  across a cell membrane by diffusion  depends on the balance of the  concentration gradient and the electrical  force – depends on membrane potential  and charge on solute.
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lecture0305audio - Diffusion UNCHARGED molecules Direction...

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