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Z-disc is formed by :-...

Z-disc is formed by `:-`

A

Actin protein

B

Myosin protein

C

Actinin protein

D

Myomesin protein

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question "Z-disc is formed by:", we can break down the information provided in the video transcript into a step-by-step solution. ### Step-by-Step Solution: 1. **Understanding Z-disc**: - The Z-disc, also known as the Z line or Z bodies, is a crucial component of the sarcomere, which is the basic contractile unit of striated muscle. 2. **Definition of Sarcomere**: - A sarcomere is defined as the segment between two neighboring Z lines. This means that the Z-disc marks the boundaries of a sarcomere. 3. **Appearance in Muscle Tissue**: - In electron micrographs of striated muscles, the Z line appears as a series of dark lines. This visual representation helps in identifying the structure within muscle tissue. 4. **Composition of Z-disc**: - The core of the Z-disc consists primarily of actin filaments. Actin is a type of protein that forms the thin filament in muscle fibers. 5. **Role of Actin**: - The actin filaments from adjacent sarcomeres are cross-linked by a protein called actinin. This cross-linking is essential for maintaining the structural integrity of the muscle fibers. 6. **Conclusion**: - Based on the information, we can conclude that the Z-disc is formed by actin proteins. ### Final Answer: The Z-disc is formed by actin proteins.
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