Discontinuous covering of myelin sheath of nerve fibres helps in :-

Options

A. Continuous conduction of nerve impulse
B. Nerve impulse become slow due to discontinuous sheath
C. Nerve impulse become fast due to saltatory conduction
D. There is no conduction of nerve impulse

Answer

### Step-by-Step Solution:

1. **Understanding Myelin Sheath**: The myelin sheath is a protective covering that surrounds the axons of many nerve fibers. It is composed of lipids and proteins and is crucial for the proper functioning of the nervous system.

2. **Identifying Discontinuity**: The myelin sheath is not continuous along the entire length of the axon. There are gaps in the myelin sheath known as the nodes of Ranvier. These nodes are essential for the conduction of nerve impulses.

3. **Role of Schwann Cells**: The myelin sheath is formed by Schwann cells, which wrap around the axon. These cells are responsible for the secretion of the myelin that forms the sheath.

4. **Understanding Saltatory Conduction**: The presence of nodes of Ranvier allows for a special type of impulse conduction called saltatory conduction. In this process, the nerve impulse jumps from one node to the next, rather than traveling continuously along the axon.

5. **Implication of Saltatory Conduction**: Saltatory conduction significantly increases the speed of nerve impulse transmission. This is because the action potential is only generated at the nodes of Ranvier, allowing the impulse to travel much faster compared to unmyelinated fibers.

6. **Conclusion**: Therefore, the discontinuous covering of the myelin sheath of nerve fibers helps in increasing the speed of nerve impulse transmission through saltatory conduction.

### Final Answer:
The discontinuous covering of the myelin sheath of nerve fibers helps in increasing the speed of nerve impulse transmission due to saltatory conduction.

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