Which region has only thick filaments?
Correct answer: B. H-zone
- A. I-band
- B. H-zone
- C. A-band
- D. Sarcomere
- E. Region between two M-lines
Explanation
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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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