Which of the following statements about the striated muscle is incorrect

Options

A. In the centre of each I-band is an elastic (Z-line) which bisects it.
B. Thin filaments are firmly attached to the Z-line.
C. M-line is a fibrous membrane in the middle of A-bands.
D. none of these

Explanation

To determine which statement about striated muscle is incorrect, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Identify the Statements**: We have several statements regarding striated muscles. We need to evaluate each one to find the incorrect statement.

2. **Evaluate Statement A**:
- Statement A claims that "In the center of each eye band is an elastic fiber which we call z-line which bisects it."
- This statement is correct. The Z-line (or Z-disc) is indeed located in the center of the I-band and serves as an attachment point for thin filaments.

3. **Evaluate Statement B**:
- Statement B states that "Thin filaments are firmly attached to the z-line."
- This statement is also correct. Thin filaments (actin) are anchored to the Z-line.

4. **Evaluate Statement C**:
- Statement C mentions that "M-line is a fibrous membrane in the middle of A-bands."
- This statement is correct as well. The M-line is located in the center of the A-band and serves as an anchoring point for thick filaments (myosin).

5. **Conclusion**:
- After evaluating all three statements (A, B, and C), we find that they are all correct. Therefore, if we are looking for an incorrect statement, we conclude that none of the provided statements are incorrect.

### Final Answer:
None of the statements about striated muscle are incorrect.

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