If a cross section of a sarcomere is seen, each myosin is surrounded by how many actin molecules:
Correct answer: C. 6
- A. 9
- B. 5
- C. 6
- D. 7
Explanation
In a cross-section of the sarcomere, each thick filament lies at the centre of a hexagonal arrangement and is surrounded by six thin actin filaments. The common error is five or seven, which results from not recognizing the regular hexagonal packing pattern.
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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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