muscle contraction steps
muscle contraction step 10
Myosin head pivots (pulling actin)
muscle contraction step 12
Myosin re-extends into "ready" position (ATP->ADP+Pi)(ADP is bound to myosin)
muscle contraction step 11
Myosin releases from actin (cross bridge is broken)(another ATP binds to myosin)
muscle contraction step 1
Neuron action potential arrives at end of motor neuron
muscle contraction step 4
Permeability of sarcolemma changes (Na rushes in)(an action potential is produced)
muscle contraction step 8
Troponin changes shape and shifts tropomyosin to expose binding sites of actin
muscle contraction step 9
myosin binds to actin (cross bridge is formend)(ADP released from myosin)
muscle contraction step 6
release of Ca from the cisternae of the sarcoplasmic reticulum
muscle contraction step 7
CA binds to troponin
muscle contraction step 5
Muscle action potential sweeps into the T tubules triggering
muscle contraction step 2
ACH is released
muscle contraction step 3
ACh binds to receptors on motor end plate