When muscle contracts, thick and thin filaments undergo:
Correct answer: A. Overlapping
- A. Overlapping
- B. Shortening
- C. Lengthening
- D. Contraction
Explanation
During muscle contraction, the thick (myosin) and thin (actin) filaments undergo overlapping. The sliding filament mechanism describes how the myosin heads of the thick filaments attach to the actin filaments and pull them toward the center of the sarcomere, causing the filaments to overlap. This overlapping is a fundamental part of the mechanism that generates muscle force and contraction.
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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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