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Personal Trainer Practice Questions

Category - NSCA

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Which of the following correctly describes what happens within the muscle fiber during contraction?

Myosin cross-bridges bind, actin slides over myosin, Z lines are pulled together
Z lines are pulled together, myosin slides over actin, myosin cross-bridges bind
Myofilaments shorten in length, sarcomere lengthens, Z lines are pulled together
Myosin filaments shorten, actin slides over myosin, A band shortens

Explanation

Answer: A - During muscle contraction, the myosin cross-bridges bind, actin slides over myosin and Z lines are pulled together. Myofilaments do not change in length, but the sarcomere does.

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