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OpenStudy (anonymous):

Calcium ions bind to troponin. Tropomyosin moves. Calcium pumps of the sarcoplasmic reticulum open. Myosin heads bend to attach to actin filaments. What would be the correct order of the steps above?

OpenStudy (anonymous):

1, 4, 3, 2 1, 2, 3, 4 3, 1, 2, 4 3, 2, 1, 4

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