Question

1. What’s the difference between myelinated and unmyelinated neurons? What’s the effect of myelin on nerve stimulus transmission?

Answer 1

Ans. The difference between

MYELINATED:

1. the nerve fibre that are insulated by a mylein sheath . 2. The myleinated nerve fibre are white in colour  

3. The myelinated nerve fibre have nodes of Ranvier, the speed of transmission of nerve impulse is high in myleinated nerve fibre .

4. Myelinated nerves do not lose the impulse during conduction.  

5. The nerve fibre with long axons are myelinated.

UNMYELINATED:

1. nerve fibre that do not have a myelin sheath

2. Grey in colour

3. Do not have node of Ranvier. So, The speed of transmission of nerve impulse is low

4. It can loose the nerve impulse during conduction

5. The short axon nerve fibres are Unmyelinated.

The effect of mylein :

Nerve impulse can be speed up by axons containing a special substance called myelin. Mylein is a fatty substance that insulates the nerve cell axon so as to increase the speed at which information travel faster from one nerve cell body to another as compare to a neuron that does not have a mylein sheath covering . The cells responsible for producing the mylein sheath in the central nervous system are called oligodendrocyte a while the cell that create the mylein sheath in the peripheral nervous system are called Schwann cells.

; for ex: from a nerve cell body to a muscle.