Question

If myelin sheath is continuous in myelinated nerve fibre than what will happens in neuronal conduction?

• A. Velocity is increased
• B. Conduction is slow
• C. Conduction is stopped
• D. No effect

Answer 1

The correct option is B Conduction is slow

• The myelin sheath on the neurons produced by the oligodendrocytes in the CNS and the Schwann cells in the PNS provides an insulated covering to the neuron.
• This insulated neuron has regions that are not covered with myelin called the nodes of Ranvier. This arrangement helps the nerve impulses to jump from node to node instead of traveling the entire length of the neuron.
• This increases the velocity of the transmission of nerve impulses. If the entire length of the nerve fiber is covered with myelin, the conduction becomes very slow.

So, the correct answer is 'Conduction is slow'.