What happens during muscle contraction to the length of each myosin and action filament?
Correct answer: A. Z- lines get closer
- A. Z- lines get closer
- B. A band becomes short
- C. 1 band elongates
- D. There is no change in sarcomere
Explanation
During contraction, actin slides over myosin without either filament changing length, bringing the two Z-lines closer together. Students may choose A band becomes short, but the A band represents the length of thick filaments and remains constant; the I band and H zone shorten.
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