nerve transmission - non-myelinated neurones

• what is meant by a non-myelinated neurone


  the neurone is not surrounded by myelinated sheath
• what happens to sodium ions during depoalrisation


  sodium ions will rapidly diffuse into the axon during depolarisation and diffuse down their concentration gradient to the next part of the axon
• what happens after the sodium ions diffuse down the concentration gradient and into the next part of the axon


  it will depolarise the adjacent section of the membrane causing the sodium ion channels to open
• what happens after the sodium ion channels open during depolarisation


  more sodium will diffuse in generating an action potential creating a wave of depolarisation along the axon
• what happens at the site of initial action potential


  the sodium ions channels become inactive until resting potential has been established