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Steps to Muscle Contraction
Neuron action potential arrives at end of motor neuron
ACH is released
ACh binds to receptors on motor end plate
Permeability of sarcolemma changes (Na rushes in)(an action potential is produced)
Muscle action potential sweeps into the T tubules triggering
release of Ca from the cisternae of the sarcoplasmic reticulum
CA binds to troponin
Troponin changes shape and shifts tropomyosin to expose binding sites of actin
myosin binds to actin (cross bridge is formend)(ADP released from myosin)
Myosin head pivots (pulling actin)
Myosin releases from actin (cross bridge is broken)(another ATP binds to myosin)
Myosin re-extends into "ready" position (ATP->ADP+Pi)(ADP is bound to myosin)