The A-band contains
Correct answer: C. Both actin and myosin
- A. Only actin
- B. Only myosin
- C. Both actin and myosin
- D. Neither
Explanation
The A-band (dark) contains the entire length of myosin filaments and overlapping actin filaments.
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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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