Give only the statement of sliding theory

Answer

**Step-by-Step Solution:**

1. **Introduction to Sliding Theory**: The sliding theory is a concept related to muscle contraction, which explains how muscles shorten and produce movement.

2. **Proponents of the Theory**: This theory was proposed by scientists Huxley and Huxley.

3. **Main Statement of the Theory**: The core statement of the sliding theory is that during muscle contraction, the actin filaments (thin filaments) slide over the myosin filaments (thick filaments).

4. **Fixed Position of Myosin**: According to this theory, the position of the myosin filaments remains fixed or constant during contraction.

5. **Movement of Actin**: It is primarily the actin filaments that move, resulting in the contraction of the muscle and the subsequent movement of body parts.

6. **Visual Representation**: In an electron microscopic image, the I band (blue zone) represents the area of actin filaments, while the A band (pink zone) represents the area of myosin filaments. During contraction, the I band decreases in length, demonstrating that actin slides over myosin, confirming the theory.

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