Biology Forum Cell Biology permeability of K+

last updated by nugget 18 years ago
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    • #4765
      nugget
      Participant

      Hello

      I cannot seem to understand what the permeability of an ion means.If Potassium is more permeable comparitively to Sodium in reference to Resting membrane potentials what does that mean?it leaks out of the cell more than sodium?? is it smaller than sodium?

      i hope someone can explain this to me 🙂

      thank you very much

    • #48287
      MrMistery
      Participant

      it is smaller than sodium but that has nothing to do with it. Some resting ion channels are open during resting membrane potential(more than na channels) so it leaks out more than sodium leakes in. Membrane potential is mainained by the Na/K pump…

    • #48292
      nugget
      Participant

      thank you…

      is the opposing electric and chemical gradients got to do with this? why is more Na pmped out than K pumped in?

      cheers

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