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What are the two protein filaments that slide over each other during a muscle contraction (sliding filament theory)?

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Final answer:

Actin and myosin are the two protein filaments that slide over each other during a muscle contraction.

Step-by-step explanation:

The two protein filaments that slide over each other during a muscle contraction in the sliding filament theory are actin and myosin. Actin is a thin protein filament that slides over the thick myosin filament to produce muscle contraction. This process is driven by the binding of myosin to actin, forming cross-bridges that generate filament movement.

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