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