A student simulates muscle contraction in a model using the following order of events: 1.Calcium pumps of the sarcoplasmic reticulum open. 2.Tropomyosin moves. 3.Calcium ions bind to troponin. 4.Myosin heads bend to attach to actin filaments. Based on the order of steps in the student's model, will the muscle successfully contract?

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A student simulates muscle contraction in a model using the following order of events: 1.Calcium pumps of the sarcoplasmic reticulum open. 2.Tropomyosin moves. 3.Calcium ions bind to troponin. 4.Myosin heads bend to attach to actin filaments. Based on the order of steps in the student's model, will the muscle successfully contract?

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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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@sleepyjess @KAKES1967 please helppppp.
I think it's A
Without being completely sure, I would think that the correct order is to switch 2 and 3. Tropomyosin sits outside of the actin which blocks the binding sites (where the myosin head will bind), so the calcium ions need to bind to troponin (number 3), which will cause the tropomyosin to move (number 2).

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