The contraction of muscle by actin and myosin is described by which biological theory?
Correct answer: D. Sliding filament theory
- A. Endosymbiotic theory
- B. Central Dogma theory
- C. Cross-bridge theory
- D. Sliding filament theory
Explanation
The sliding filament theory is the explanation for how muscles contract to produce force. The actin and myosin filaments within the sarcomeres of muscle fibres bind to create cross-bridges and slide past one another, creating a 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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