Question

___ increases insulation of nerve fibres and increases speed of conduction.

• A. Neuronal membrane
• B. Myelin sheath
• C. Non-neuronal cells like astrocytes
• D. Membrane proteins

Answer 1

The correct option is B Myelin sheath

Myelin produced by Schwann cells in the PNS and oligodendrocytes in the CNS, is a white fatty substance that coats nerve fibres and increase their insulation. Increasing insulation reduces current loss during transmission just as in any electrical wires, and increases rate of conduction by causing the impulse to jump from one Node of Ranvier to another.