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Answer:
During muscle contraction, high concentrations of calcium are required to displace troponin and reveal the active site at which myosin binds to for the power stroke.
Step-by-step explanation:
As in vertebrate muscles, calcium ions act as the initiator of contraction. The difference is that the component that binds calcium ions in the molluscan muscle is myosin rather than a component of the actin-containing thin filaments.