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ICSE Class 7 Answered

Speed of nerve impulse is more in myelinated nerve fibers. Why?  
Asked by Amandeepsidhu | 27 Jan, 2020, 10:06: PM
answered-by-expert Expert Answer
  • Myelinated neurons have a membranous, lipid sheath called myelin.
  • Myelin is a highly organized multilamellar structure formed by the plasma membrane of oligodendrocytes in the CNS and Schwann cells in the PNS.
  • Myelin is an electrical insulator which allows increased speed of conduction along an axon.
  • Myelinated nerve fibres are found in spinal and cranial nerves where signals have to be conducted at a faster rate.
  • Neurons which have to pass information about sudden pain, such as touching a burning hot pan, need to myelinated to protect the body against these kind of dangers. 
Answered by Sheetal Kolte | 28 Jan, 2020, 10:31: AM
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