In the sliding filament theory of muscle contraction, which option correctly describes function of ATP?
Correct answer: B. It allows the myosin head to detach from the actin filament.
- A. ATP does all of these things during muscle contraction.
- B. It allows the myosin head to detach from the actin filament.
- C. It moves tropomyosin off of actin binding sites.
- D. Both A and B
Explanation
Energy from ATP is required for the myosin head to release from the actin filament-otherwise the myosin heads would remain in the same place, and the muscle would not contract. Even though the filaments are moving, the filaments themselves never actually get shorter or longer.
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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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