Final answer:
Actin is the main component of thin filaments in muscle fibers, interacting with myosin for muscle contraction.
Explanation:
The main component of the thin filaments in muscle fibers responsible for muscle contraction is actin. Actin, along with the protein myosin, forms the thick and thin filaments in muscle cells that slide across each other during contraction. These proteins work together with ATP to enable muscle movement.
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