Major protein in the thick filaments of skeletal muscle fibre is

Options

A. actin
B. mysoin
C. troponin
D. tropomysoin

Answer

To answer the question "Major protein in the thick filaments of skeletal muscle fibre is," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Skeletal Muscle Fiber**:
- Skeletal muscle fibers consist of two types of filaments: thick filaments and thin filaments.

2. **Identify the Types of Filaments**:
- The thick filaments are primarily composed of one major protein, while the thin filaments are composed of different proteins.

3. **Determine the Major Protein in Thick Filaments**:
- The thick filaments are predominantly made up of the protein myosin.

4. **Clarify the Composition of Myosin**:
- Myosin is a complex protein that consists of many monomeric proteins known as meromyosins.

5. **Conclude the Answer**:
- Therefore, the major protein in the thick filaments of skeletal muscle fiber is **myosin**.

### Final Answer:
The major protein in the thick filaments of skeletal muscle fiber is **myosin**.

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