What causes the myosin binding site of an actin molecule to be exposed?

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Question:What causes the myosin binding site of an actin molecule to be exposed?

1.calcium ions attaching to troponin

2.ATP attaching to the myosin cross-bridge

3.a nerve impulse reaching the motor end plate of a motor nerve

4.acetylcholine crossing the neuromuscular junction

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  1. What causes the myosin binding site of an actin molecule to be exposed?
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