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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The accumulation of 'lactic acid' in the muscles results in:
During the sliding of actin filaments, ATP is used for?
Which of the following changes occurs when skeletal muscles contract:
Sarcomere is part of myofibril between:
Contraction can be sustained for a long period of time by:
During muscle relaxation, the calcium ions are: