Diameter of thick filament is____________?
Correct answer: C. 16nm
- A. 7 nm.
- B. 8 nm
- C. 16nm
- D. 10-100 ?m.
Explanation
A thick myosin filament has a diameter of about 15 to 16 nm, so 16 nm is the appropriate value. Students may choose 7 nm because thin actin filaments are about 7 nm in diameter, while 10 to 100 micrometres is far too large for a filament.
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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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