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Why does the nerve impulse flow more rapidly in myelinated nerve fibres than in the non-myelinated fibres ?
The nerve impulses flow more rapidly in the myelinated nerve fibres as compared to the non-myelinated because of the following reasons
1. Due to saltatory conduction in myelinated nerve fibre, the impulse moves faster
2. Myelin sheath behaves as insulator ahence the nerve signal travels fast.
3. In myelinated fibres the nerve impulse jumps from one node of Ranvier to other. Thus, it is faster. However the impulse has to travel all along the non-myelinated fibre. So, it flows slowly.
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