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Standard XII
Biology
Question

Node of Ranvier occurs where

  1. Nerve is covered with myelin sheath
  2. Neurilemma is discontinuous
  3. Myelin sheath is discontinuous
  4. Neurilemma and myelin sheath are discontinuous

A
Neurilemma is discontinuous
B
Myelin sheath is discontinuous
C
Neurilemma and myelin sheath are discontinuous
D
Nerve is covered with myelin sheath
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Solution
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D. Myelin sheath is discontinuous
Reason: A fat layer that surrounds the axon is known as Myelin sheath. it is formed by Schwann cell. This covering is not continuous but leave gaps in between calling the nodes of Ranvier. These serve to facilitate the rapid conduction of nerve impulses as the action potential jumps from one node to another. So the correct option is D.

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