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Contractile protein is...

Contractile protein is

A

actin

B

myosin

C

tropnin

D

tropomyosin

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Contractile Proteins**: - Contractile proteins are proteins that are responsible for muscle contraction and movement in cells. They play a crucial role in the structure and function of muscle tissue. 2. **Identifying the Options**: - The options given are: 1. Actin 2. Myosin 3. Troponin 4. Tropomycin 3. **Analyzing Each Option**: - **Actin**: This is a key contractile protein that forms thin filaments in muscle fibers. It exists in two forms: G-actin (globular actin) and F-actin (filamentous actin). - **Myosin**: This is another important contractile protein that forms thick filaments and works alongside actin in muscle contraction. - **Troponin**: This is a regulatory protein that binds to actin and tropomyosin, playing a role in muscle contraction but is not a contractile protein itself. - **Tropomyosin**: This protein also regulates muscle contraction by blocking the binding sites on actin but is not contractile. 4. **Conclusion**: - The primary contractile protein responsible for muscle contraction is **Actin**. Therefore, the correct answer is **Option 1: Actin**.
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