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๐Ÿ›ด Nerve impulses and the motor neurone

Letโ€™s delve into the basics of nervous transmission by looking at a motor neurone. Here is the structure of a myelinated motor neurone:

 

 

Labelled โ€œinsulating sheathโ€, the myelin sheath is responsible for protecting the electrical impulses that run across the neurone.

 

But first, what happens in a resting state where no impulses are being sent?

 

This is the resting potential where the membrane permeability differentiates between sodium (Na+) and potassium (K+) ions so that at any given time there are more Na+ ions outside than inside and more K+ ions inside than…

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