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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