Question

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what are actin and myosin?
two proteins that make up the cell membrane.
two proteins that are involved in nerve signaling.
two proteins that are essential for muscle contraction.
two proteins that are essential for nerve function.
two proteins that are involved in blood clotting.

Explanation:

Actin and myosin are key proteins in muscle - they interact to cause muscle contraction. Actin forms thin filaments and myosin forms thick filaments in muscle fibers. Their sliding - filament mechanism is responsible for muscle movement.

Answer:

Two proteins that are essential for muscle contraction.