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Function of myelin sheath and Acetyl choline

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Myelin sheath allows electrical impulses to transmit quickly and efficiently along the nerve cells.
Acetylcholine is the chief neurotransmitter of parasympathetic nervous system that contracts smooth muscles, dilates blood vessels, increases bodily secretion and slows heart rate.
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Myelin is an insulating layer or sheath that from around nerves, including those in the brain and spinal cord. It is made up of protein and fatty substances. This is myelin sheath allow electrical impulses to transmit quickly and efficiently along the nerve cells
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Myelin sheath acts like a insulation and prevents mixing of impulses in the adjacent axons.
Acetylcholine is the chemical which helps the impulse to jump into the next neuron
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