What is the correct order of events in the sliding filament theory of muscle contraction?1. Myosin head binds to actin2. Calcium ions bind to troponin3. Myosin cross-bridges bend, pulling actin toward center of sarcomere4. ATP is split into ADP and P5. Tropomyosin moves to expose active sites of actin6. Sarcoplasmic reticulum releases calcium ions7. ADP and P released from myosin
A. 1,2,3,4,5,6,7
B. 6,2,5,4,1,7,3
C. 2,4,6,1,3,5,7
D. 4,2,7,1,6,5,3
Answer: B
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