Question

what are thin filaments composed of?
o bundles of myosin and troponin
o bundles of myosin
o two intertwined strands of actin
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Explanation:

Thin filaments in muscle are primarily composed of two intertwined strands of actin, along with troponin and tropomyosin regulatory proteins. Myosin is part of thick filaments.

Answer:

Two intertwined strands of actin