permeability of K+

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nugget
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permeability of K+

Post by nugget » Thu May 11, 2006 4:43 pm

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

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MrMistery
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Post by MrMistery » Fri May 12, 2006 4:50 pm

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...
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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nugget
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Post by nugget » Fri May 12, 2006 5:27 pm

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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