During muscle contraction, the cross-bridges of thick filaments become attached to:
Correct answer: C. Binding sites on actin filament
- A. Myosin filament
- B. Binding sites of myosin filament
- C. Binding sites on actin filament
- D. Actin filament
Explanation
Myosin heads bind to the binding sites on actin filaments to make cross bridges. These myosin heads bring the actin filaments toward the center of the sarcomere by contracting.
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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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