ICSE Class 7 Answered
Speed of nerve impulse is more in myelinated nerve fibers. Why?
Asked by Amandeepsidhu | 27 Jan, 2020, 10:06: PM
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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