Question

The nodes of ranvier are
(a) the points in which the axon is exposed
(b) the contact points found over the non-
myelinated nerve fiber
(c) areas in which the axons swell up
(d) areas where the neurilemma touches the axon

Answer 1

Answer:

I think option a is correct :the points in which the axon is exposed.

Answer 2

The nodes of Ranvier are the points in which the axon is exposed

Option (a)

Explanation:

• The node of ranvier are point in the axon where there is no myelination of the nerve fibres and as a result the exam is directly exposed.
• Due to this reason there is fast transfer of the nerve impulse in this myelinated nerve fibres due to the presence of this node of Ranvier.
• The nodes of ranvier are essential for all neurones where a fast speed of transfer of nerve impulses is required as in the central nervous system.

To know more about the structure of neurone,

Briefly describe the structure of the neurone. Brainly.in

https://brainly.in/question/13899878