Multiple choice

Which of the following statements is correct for muscle contraction?

  1. Length of H-zone is decreased.

  2. Length of A-band remains constant.

  3. Length of I-band gets increased.

  4. Lengths of two Z-lines get increased.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  During muscle contraction, actin and myosin interact to form actomyosin. According to sliding filament theory, cross bridge is formed by myosin filament to slide act in filament. During muscle contraction, length of A-band remains constant.

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