CameraIcon

SearchIcon

MyQuestionIcon

31

You visited us 31 times! Enjoying our articles? Unlock Full Access!

CNS

Unmyelinated ...

Question

Unmyelinated axons differ from myelinated in that they

A

Are more excitable

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

Lack nodes of Ranvier

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

C

Are not capable of regeneration

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

Are not associated with Schwann cells

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B Lack nodes of Ranvier
Myelin sheath is discontinuous because of the presence of nodes of Ranvier. Nodes of Ranvier, the periodic gap in the insulating sheath (myelin) on the axon of certain neurons that serves to facilitate the rapid conduction of nerve impulses. However, nodes of Ranvier interrupt the insulation at intervals, and this discontinuity enables impulses to jump from node to node in a process known as saltatory conduction. Whereas unmyelinated axons (axon is not covered with myelin sheath) lack nodes of Ranvier and makes it different from the myelinates axon.

Suggest Corrections

thumbs-up

0

Similar questions

Q. Consider the following statements and find out coorect option:
(a) Three are two types of axons, namely myelinated and non myelinated
(b) Myelinated nerve fibres found in autonomous and the somatic neural systems
(c) The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(d) The gap between two adjacent myelin sheaths are calleds nodes of Ranvier.
(e) Unmyelinated nerve fibre found in spinal and cranial nerves
(f) Unmyelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath around the axon.

A myelinated nerve fibre is enveloped by Schwann cells, which form a myelin sheath around the axon.

An unmyelinated nerve fibre is not enclosed by a Schwann cell and hence does not form a myelin sheath around the axon.

Q. Read the given statements and select the correct option.
(i) Synaptic cleft of neurons secretes adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cells that does not form a myelin sheath.
(iii) Spinal and cranial nerves are made of non-myelinated nerve fibres

Q. Consider the following statements and state true or false.
1. Synaptic cleft of neurons secrete adrenaline.
2. Myelinated nerve fibres and enveloped with Schwann cells, which form a myelin sheath around the axon.
3. Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
4. Spinal cord and cranial nerves are made up of non-myelinated nerve fibres.

Q. Read the given statements and select the correct ones.
(i) Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body.
(ii) Unmyelinated nerve fibres do not have Schwann cells which from the myelin sheath.
(iii) Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K+) than to sodium ions (Na+).
(iv) A synapse is formed by the membranes of a presynaptic neuron and a post synaptic neuron.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Organisation of the Nervous System

BIOLOGY

Watch in App

explore_more_icon

Explore more

Standard XII Biology

Join BYJU'S Learning Program

CrossIcon