How many actin filaments surround each myosin filament?
Correct answer: C. 6
- A. 2
- B. 4
- C. 6
- D. 8
Explanation
The myosin filament is surrounded by six actin filaments and each actin filament is in turn surrounded by three myosin filaments. This arrangement of the actin and myosin filaments produces a striated appearance to the muscle. (Fact) The other options are incorrect.
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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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