Which occurs FIRST as a result of ATP binding to myosin?
A. Actin binds to myosin.
B. Cross-bridges rotate, sliding past the thin filament.
C. Cross-bridge heads are cocked into an "energized" state.
D. Actin dissociates from myosin.
E. Ca2+ is released from the sarcoplasmic reticulum.
Answer: D
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