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Thank you for your suggestions but I understand the chemistry and how muscles work but I can't get my head around how ATP actually powers the muscle. For example - with magnetism you can imagine invisible elastic bands or with an electric motor , the coils create a magnetic field that causes the rotor to be attracted to the permanent magnets. What I can't get is what happens when ATP loses a phospate and becomes ADP - how does this actually power the muscle ( or any cell for that matter ) I know this is a really terribly constructed question ... sorry