Why Is ATP Needed for Muscle Contraction

Why is ATP needed for muscle contraction?

A) It causes tropomyosin to slide off the myosin-binding sites of actin.
B) It's needed for calcium release from the sarcoplasmic reticulum.
C) It causes calcium to bind to troponin.
D) Myosin must contact the actin filament and move to pull it toward the midline of the sarcomere.

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