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Thread: Nerve Impulse

  1. #1 Nerve Impulse 
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    When Na+ enters the cell, that area of the cell becomes depolarized. What I don't understand is why does this depolarization allow the nerve impulse to move along the neuron?


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    SHF
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    Depolarisation induces the opening of voltage gated sodium channels in the neighbouring membrane patch, this is how nerve impulses propagate (read up on 'action potentials')


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  4. #3  
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    But why does this allow the nerve impulse to move along the neuron?

    Why can't the nerver impulse move If the internal environment of the cell remained negatively charged?
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  5. #4  
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    The progressive change in polarization is the nerve impulse. It is not a change that happens incidentaly, it is the impulse.
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  6. #5  
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    Quote Originally Posted by Sealeaf View Post
    The progressive change in polarization is the nerve impulse. It is not a change that happens incidentaly, it is the impulse.
    I see. So would it be accurate to say that the change in charge allows the nerve impulse to progress along the neuron?

    Or....the change in charge propagates the nerve impulse along the neuron?
    Last edited by walker8476; November 1st, 2012 at 01:56 AM.
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  7. #6  
    SHF
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    Quote Originally Posted by walker8476 View Post

    I see. So would it be accurate to say that the change in charge allows the nerve impulse to progress along the neuron?

    Or....the change in charge propagates the nerve impulse along the neuron?
    This is answered by the previous post when Sealeaf said "The progressive change in polarization is the nerve impulse"

    So when you ask if it is accurate to say that the change in charge allows the nerve impulse to progress.......you know what I'm going to say, which is that the change in charge is the action potential, as a membrane patch is depolarised so is the neighbouring patch and so on, this 'wave of depolarisation' is the nerve impulse is the action potential is the transmission of information is the whatever you want to call it.

    Animations are useful, see the below link and there are many others on youtube

    Animation The Nerve Impulse - YouTube
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