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Myosin filaments are localized in...

Myosin filaments are localized in

A

Z band

B

H band

C

A band

D

None of the above

Text Solution

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The correct Answer is:
To answer the question "Myosin filaments are localized in," we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Myofibrils**: Myofibrils are the basic rod-like units of a muscle cell (muscle fiber) that play a crucial role in muscle contraction. They are composed of two types of filaments: thick filaments and thin filaments. 2. **Identifying the Types of Filaments**: The thick filaments are primarily made up of myosin, while the thin filaments are primarily composed of actin. 3. **Differentiating Between Bands**: Myofibrils exhibit a striated appearance due to the arrangement of these filaments into alternating light and dark bands: - The **I-band** (light band) contains actin filaments and is also known as the isotropic band. - The **A-band** (dark band) contains myosin filaments and is referred to as the anisotropic band. 4. **Locating Myosin Filaments**: Since myosin filaments are part of the thick filaments, they are specifically located in the A-band of the myofibrils. 5. **Conclusion**: Therefore, myosin filaments are localized in the A-band. ### Final Answer: Myosin filaments are localized in the A-band. ---
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