Changes in sarcomere length are due to the filaments pulled along the thick filaments in the direction of the:
Correct answer: B. M line
- A. H zone
- B. M line
- C. Z line
- D. I band
Explanation
The A band does not shorten, it remains the same length, but A bands of different sarcomeres move closer together during contraction, eventually disappearing. Thin filaments are pulled by the thick filaments toward the center of the sarcomere near the "M Line".
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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