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Byju's Answer
Standard XII
Biology
Myelinated and Unmyelinated Fibres
Node of Ranvi...
Question
Node of Ranvier occurs where
A
Nerve is covered with myelin sheath
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B
Neurolemma is discontinuous
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C
Neurolemma and myelin sheath are discontinuous
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D
Myelin sheath is discontinuous
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Solution
The correct option is
D
Myelin sheath is discontinuous
Myelin sheath is a fat layer formed by the Schwann cells that surround the axon.
They are not continuous but leave gaps in between called the nodes of Ranvier
So, the correct answer is '
Myelin sheath is discontinuous'
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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.
Q.
Myelin sheath covers
Q.
Myelin sheath covers ____________.
Q.
Myelin sheath is a layer covering
Q.
Is myelin sheath present around the Schwann cell or Schwann cells are present around myelin sheath?
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Myelinated and Unmyelinated Fibres
Standard XII Biology
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