The Myelin sheath

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Author:
camturnbull
ID:
264720
Filename:
The Myelin sheath
Updated:
2014-03-02 17:04:53
Tags:
Biology impulses camturnbull
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Description:
AQA BIOL5 Impulses
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  1. Why is the transmission of impulses slow in a non myelinated axon?
    The whole membrane must be depolarised section by section
  2. Why is transmission of impulses faster in a myelinated axon?
    • The myelin sheath prevents the diffusion of ions across the membrane so depolarisation only occurs at the nodes of ranvierĀ 
    • The impulse then jumps from node to node, missing out large sections of the axon
  3. What other factors can speed up the rate of transmission of a nerve impulse?
    • Higher temperature (more kinetic energy)
    • Thicker axon diameter which reduced leakages of ions from the axon

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