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How is the impulse passed along an axon?

When a neurone is stimulated a sequence of action potentials is triggered along the length
of the axon
As part of the membrane becomes depolarised at the site of an action potential = a local
electrical current is created as the charged…

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At resting potential there is a positive charge
on outside of membrane and negative charge
on the inside
High Na+ conc on outside and high K+ conc on

When stimulated, sodium ion channels opens =
sodium ions flow into the axon
This depolarises the membrane
Localised electric currents are…

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*sodium and potassium channels are voltage dependent

Speed of conduction
The speed of conduction can be determined by the diameter of the axon
The wider the diameter the faster the nerve impulse travels
The myelin sheath acts as an electrical insulator along most of the axon= preventing flow
of ions…


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