★ Musculoskeletal System Responses to Exercises Quiz
What is the primary function of the sarcoplasmic reticulum in muscle cells?
A. Store and release calcium ions
B. Generate ATP for muscle contraction
C. Anchor myosin to actin filaments
D. Regulate muscle flexibility
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What is the function of the binding site where myosin binds to actin?
A. Stretch the actin filament
B. Initiate muscle contraction
C. Generate energy for muscle contraction
D. Prevent muscle relaxation
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