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Describe steps 4-6

Where are the voltage-gated sodium channels and how are they operated?

What is the voltage across the membrane at rest and what is this known as?

What does the movement of sodium ions along the neurones alter?

What do the gates do when the potential difference across the membrane is reduced?

What is the effect of the gates opening?

What is the myelin sheath?

What cannot diffuse through this fatty layer?

What are the gaps in the myelin sheath?

Where do the ionic exchanges occur in a myelinated neurone?