Muscle Structure · NCERT Biology

The 'M-line' is a thin fibrous membrane that holds together:

  1. Actin filaments in the middle of the I-band, anchoring thin filaments
  2. Myosin filaments in the middle of the A-band
  3. The sarcolemma and the underlying sarcoplasm together
  4. Troponin and Tropomyosin
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Correct answer: Myosin filaments in the middle of the A-band

The thick filaments in the A-band are held together in the middle of this band by a thin fibrous membrane called the M-line. This helps maintain the structural integrity of the sarcomere.

Difficulty: Medium Question 15 of 20

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