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In a myofibril , the band which contains...

In a myofibril , the band which contains only actin filament is also known as

A

Isotropic band

B

Anisotropic band

C

Inotropic band

D

Dark band

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The correct Answer is:
To solve the question regarding the band in a myofibril that contains only actin filaments, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Structure of Myofibrils**: - Myofibrils are the basic rod-like units of a muscle cell and are composed of repeating units called sarcomeres. Each sarcomere contains thick and thin filaments. 2. **Identify the Filaments**: - The thick filaments are primarily made of myosin, while the thin filaments are primarily made of actin. 3. **Examine the Bands in a Sarcomere**: - In a sarcomere, there are two main types of bands: the A band and the I band. - The A band contains both actin and myosin filaments, while the I band contains only actin filaments. 4. **Define the I Band**: - The I band is the region of the sarcomere that appears lighter and consists solely of actin filaments. It is also known as the isotropic band because it does not change its appearance when viewed from different angles. 5. **Conclusion**: - Therefore, the band that contains only actin filaments in a myofibril is known as the **I band** or the **isotropic band**. ### Final Answer: The band which contains only actin filament in a myofibril is known as the **I band** (or isotropic band). ---
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