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explain sliding filament theory

The sliding filament theory:
Impulse arrives at neuromuscular junction, and releases acetylcholine. This causes depolarisation and release of Calcium ions from the sarcoplasmic reticulum.Calcium ions bind to troponin?bringing a change in its shape so that tropomyosin moves from the active site of actin.Myosin filaments bind to actin forming cross-bridges.The muscle filament shortens in size because ATP releases energy which is used by the myosin to pull the actin filaments.?An ATP?molecule binds to the myosin head which detaches the myosin from actin.Muscular contraction continues till there is enough ATP and Calcium ions. Once the impulse stops, actin returns to its resting position and all Calcium ions are pumped back to the sarcoplasmic?reticulum.?

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Impulse arrives at neuromuscular junction, and releases acetylcholine. This causes depolarisation and release of Calcium ions from the sarcoplasmic reticulum.Calcium ions bind to troponin?bringing a change in its shape so that tropomyosin moves from the active site of actin.Myosin filaments bind to actin forming cross-bridges.The muscle filament shortens in size because ATP releases energy which is used by the myosin to pull the actin filaments.?An ATP?molecule binds to the myosin head which detaches the myosin from actin.Muscular contraction continues till there is enough ATP and Calcium ions. Once the impulse stops, actin returns to its resting position and all Calcium ions are pumped back to the sarcoplasmic?reticulum.?
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The sliding filament theory explains the mechanism of muscle contraction based on muscle proteins that slide past each other to generate movement.[1] It was independently introduced in 1954 by two research teams, one consisting of Andrew F. Huxley and Rolf Niedergerke from the University of Cambridge, and the other consisting of Hugh Huxley and Jean Hanson from the Massachusetts Institute of Technology.[2][3] It was originally conceived by Hugh Huxley in 1953. Andrew Huxley and Niedergerke introduced it as a "very attractive" hypothesis.[4]
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