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    Ok ppl

    Think I got the Action potential bit sorted....

    Ok so a resting potential gives the neurone the potential to transmit a nerve impulse...

    A resting potential is produced when the AT of Na ions out the nerve fibre..so when this happens the outside of the membrane is more +ve charged so this has polarised.....

    then....as Na ions are being pumped out K ions are being pumped in.....Depolarisation occurs when the Na ion channels open up suddenly when there is a higher conc of them outside....so they come bk in by facilitated diffusion....this movement of Na ions bk in give a more +ve than outside causing depolarisation......this change i.e from polarised to delpolarised is called the ACTION POTENTIAL????

    suggestion is it correct??? anything to add on???
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    (Original post by Bond007)
    Ok ppl

    Think I got the Action potential bit sorted....

    Ok so a resting potential gives the neurone the potential to transmit a nerve impulse...

    A resting potential is produced when the AT of Na ions out the nerve fibre..so when this happens the outside of the membrane is more +ve charged so this has polarised.....

    then....as Na ions are being pumped out K ions are being pumped in.....Depolarisation occurs when the Na ion channels open up suddenly when there is a higher conc of them outside....so they come bk in by facilitated diffusion....this movement of Na ions bk in give a more +ve than outside causing depolarisation......this change i.e from polarised to delpolarised is called the ACTION POTENTIAL????

    suggestion is it correct??? anything to add on???
    Yes that is correct.

    Then repolarisation and hyperpolarisation periods occur to get the whole thing back to a normal resting potential of -70mV or so.
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    Yep you're exactly right
    If you want to check a summary then look at
    http://www.s-cool.co.uk/topic_princi...s=&ebl=&elc=13
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    Cheerz....so when Na is being pumped out it get to +40mv and then when refactory period occurs it brings it to -70mv......
 
 
 
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