Explain the mechanism of action of contractile proteins like actin and myosin in muscle contraction. What structural features enable their function?

Contractile proteins like actin and myosin are essential for muscle contraction, and their interaction facilitates the sliding filament mechanism. The process begins with the arrival of an action potential at the neuromuscular junction, which triggers the release of calcium ions ___ __________ ____ _____ ______ _______ ______ _________.
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