Why Is ATP Needed for Muscle Contraction

question 37

Multiple Choice

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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