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Which is incorrect about muscle contract...

Which is incorrect about muscle contraction:-

A

Length of A-band remain same

B

Length of thin filament is reduced

C

Length of sarcomere is reduced

D

Length of I-band is reduced

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statement about muscle contraction is incorrect, we need to analyze the process of muscle contraction and the roles of different components involved. ### Step-by-Step Solution: 1. **Understanding Muscle Contraction**: - Muscle contraction occurs in the sarcomere, which is the structural and functional unit of muscle fibers. 2. **Components of Sarcomere**: - The sarcomere consists of thick filaments (myosin) and thin filaments (actin). 3. **Behavior of Filaments During Contraction**: - During contraction, the thick and thin filaments do not shorten. Instead, they slide past each other. This sliding mechanism is known as the sliding filament theory. 4. **Effect on Sarcomere Length**: - As the thick and thin filaments slide over one another, the overall length of the sarcomere decreases. Thus, the sarcomere shortens during contraction. 5. **Length of A Band and I Band**: - The A band (which contains the thick filaments) remains the same length during contraction because the thick filaments do not change in length. - The I band (which contains only thin filaments) decreases in length as the sarcomere shortens. 6. **Identifying the Incorrect Statement**: - Based on the above points, if a statement claims that the length of thin filaments is reduced, this is incorrect because the length of the filaments themselves does not change during contraction. Only the sarcomere shortens. ### Conclusion: The incorrect statement about muscle contraction is that the length of thin filaments is reduced. ---
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