Myelin sheath has layers of fat and protein

Options

A. Upto 100
B. 43758
C. Two each
D. One each.

Answer

### Step-by-Step Solution:

1. **Understanding Myelin Sheath**: The myelin sheath is a protective covering that surrounds myelinated nerve fibers. It is crucial for the proper functioning of the nervous system.

2. **Composition of Myelin Sheath**: The myelin sheath is composed of layers of fat and protein. Specifically, it is known as a lipoprotein layer, which means it contains both lipids (fats) and proteins.

3. **Function of Myelin Sheath**: The primary function of the myelin sheath is to insulate nerve fibers. This insulation allows nerve impulses to travel more efficiently and quickly along the nerve fibers.

4. **Saltatory Conduction**: Due to the presence of the myelin sheath, nerve impulses can jump from one node (Node of Ranvier) to another, a process known as saltatory conduction. This significantly increases the speed of nerve impulse transmission.

5. **Number of Layers**: The question asks for the number of layers of fat and protein in the myelin sheath. The myelin sheath can have up to 100 alternating layers of fat and protein.

6. **Final Answer**: Therefore, the correct answer to the question is that the myelin sheath has layers of fat and protein that can reach up to 100 in number.