Thick filaments in skeletal muscles are composed of:
Correct answer: B. Myosin
- A. Actin
- B. Myosin
- C. Tropomyosin
- D. Troponin
Explanation
The thick muscle filament is primarily composed of myosin proteins. In muscle fibers, thick filaments work together with thin filaments (actin) to facilitate muscle contraction.
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About Muscle Contraction
Muscle contraction is explained by the sliding filament model, in which myosin heads pull actin filaments within sarcomeres using ATP. The topic covers calcium, troponin, tropomyosin, the neuromuscular junction and relaxation, with attention to how filament length stays almost constant while the sarcomere shortens.
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