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This filament of myofibril contains 2 F ...

This filament of myofibril contains 2 F actins and two other proteins namely _____ and ___.

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To answer the question about the filament of myofibril that contains 2 F-actins and two other proteins, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Myofibrils**: - Myofibrils are the basic rod-like units of a muscle cell and are essential for muscle contraction. They are composed of repeating units called sarcomeres, which contain thick and thin filaments. 2. **Identifying F-actin**: - F-actin, or fibrous actin, is a polymerized form of globular actin (G-actin) and is a crucial component of the thin filaments in myofibrils. It plays a significant role in muscle contraction. 3. **Recognizing Other Proteins**: - In addition to F-actin, there are two important regulatory proteins associated with the thin filaments: **troponin** and **tropomyosin**. 4. **Function of Troponin and Tropomyosin**: - **Troponin** binds to calcium ions and plays a critical role in muscle contraction by causing a conformational change that moves tropomyosin away from the binding sites on actin, allowing myosin to bind to actin and initiate contraction. - **Tropomyosin** is a long protein that wraps around the actin filaments and blocks the binding sites for myosin when the muscle is relaxed. 5. **Final Answer**: - Therefore, the two proteins that accompany the 2 F-actins in the filament of myofibril are **troponin** and **tropomyosin**.
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