Compléter Muscle contraction stepsVersion en ligne order and explanation of muscle contractions par Rachel Beal 1 neuromuscular junctio ATP actin energy glycogen sacromeres myosin Acetylcholine is released from a neuron ending into the synaptic cleft at the 2 cross ATP bridges calcium receptors cytoplasm potassium Acetylcholine binds to and stimulates the action potentia l 3 stimulation tubules T channels sarcoplasmic contraction calcium energy actin reticulu potassium troponin The action potential travels down the sarcolemma and - and activates the in the 4 cell potassium muscl ATP myosin muscle calcium actin The sarcoplasmic reticulum releases into the 5 acetylcholine actin ATP potassium Calcium troponin glycogen calcium myosin tropomyosin binds to which shifts so that binding sites on are expose d 6 action-potential bridge troponin potassium cross Myosin calcium ATP heads bind to actin , forming - 7 cell potassium sarcoplasmic reticulum actin muscle sarcomeres calcium cytoplasm neuromuscular junction Using the chemical energy contained in ATP , myosin heads pull filaments together within the , and shorten s 8 cytoplasm ATP calcium heads potassium muscle actin ends myosin sarcoplasmic reticulum New is used to detach and move them back into position for another power strok e 9 moves calcium muscle reticulu ends energy action potential sarcoplasmic atp actin potassium begins The relaxes when stimulation , and the is pumped back into the
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