Skin, Skeleton, and Muscles Question
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Which of the following statements about muscle contraction is correct?
- Actin filaments stretch whereas myosin filaments stay the same length.
- Iron and fats bound to actin play a critical role in muscle cell contraction and relaxation
- Neither actin nor myosin change in size, although the area of overlap between them increases.
- Myosin filaments stretch where actin filaments stay the same length.