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The sliding action in the myofibril of skeletal muscle contraction requires which of the following?

The sliding action in the myofibril of skeletal muscle contraction requires which of the following? Correct Answer I, II, and III

D Muscle contractions require calcium ions, so (I) is required. You need energy order to have a muscle contraction, so (II) is required. And actin is one of the proteins involved in muscle contractions, so (III) is required. The answer is (D).

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