Which of the following changes length during sarcomere contraction?
Correct answer: C. H-zone
- A. Thick filaments
- B. M-line
- C. H-zone
- D. All of these options are correct
Explanation
The H zone-the central region of the A zone-contains only thick filaments and is shortened during contraction. Remember that the actin and myosin filaments themselves do not change length, but instead slide past each other.
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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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