Final answer:
During the cocked stage of actin-myosin, the myosin head is in a high-energy configuration and releases energy during the power stroke, resulting in muscle contraction.
Step-by-step explanation:
During the cocked stage of actin-myosin, the myosin head is in a high-energy configuration. This energy is released during the power stroke, resulting in the myosin head moving and the muscle contracting. After the power stroke, ADP is released, but the cross-bridge formed between actin and myosin remains in place. ATP then attaches to myosin, allowing the cross-bridge cycle to start again and further muscle contraction to occur.