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Summary of Skeletal Muscle Contraction (steps 9-13)
9. Myosin heads bind to actin forming cross-bridges. P are released from myosin heads
10. Heads of myosin bend, causing actin myofilaments to slide across surface of myosin myofilaments (Power-stroke)
11. ADP molecules are released from myosin heads
12. ATP can bind to myosin, breaking cross-bridge. Myofilaments return to resting state. Myosin head is “cocked” (ATP broken down to ADP + P + energy)
13. If Ca2+ is still bound to troponin and ATP is available, steps 8 – 11 repeat and muscle continues to contract
10. Heads of myosin bend, causing actin myofilaments to slide across surface of myosin myofilaments (Power-stroke)
11. ADP molecules are released from myosin heads
12. ATP can bind to myosin, breaking cross-bridge. Myofilaments return to resting state. Myosin head is “cocked” (ATP broken down to ADP + P + energy)
13. If Ca2+ is still bound to troponin and ATP is available, steps 8 – 11 repeat and muscle continues to contract
