Conduction of the Signal

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soglesby2007 on October 4, 2010

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Conduction of the Signal

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Unmyelinated Fibers

have voltage-reg. gates along the entire axolemma
when APs occur at the trigger zone:
Na+ enters and diffuses to adjacent areas
opening voltage gates just distal to the AP
Na+ and K+ gates open and close as at the trigger zone
this excites the membrane just distally
chain reaction travels to the end of the axon
relatively slow in unmyelinated axons

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Terms	Definitions
Unmyelinated Fibers	have voltage-reg. gates along the entire axolemma when APs occur at the trigger zone: Na+ enters and diffuses to adjacent areas opening voltage gates just distal to the AP Na+ and K+ gates open and close as at the trigger zone this excites the membrane just distally chain reaction travels to the end of the axon relatively slow in unmyelinated axons
Myelinated Fibers	voltage-reg. gates are scarce in the internodes 400 times more at the nodes Na+ cant diffuse anyway due to myelin sheath so the APs jump from node to node: Saltatory conduction transmit the signal much faster

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