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12 terms

muscle contraction steps

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muscle contraction step 1
Neuron action potential arrives at end of motor neuron
muscle contraction step 2
ACH is released
muscle contraction step 3
ACh binds to receptors on motor end plate
muscle contraction step 4
Permeability of sarcolemma changes (Na rushes in)(an action potential is produced)
muscle contraction step 5
Muscle action potential sweeps into the T tubules triggering
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 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 10
Myosin head pivots (pulling actin)
muscle contraction step 11
Myosin releases from actin (cross bridge is broken)(another ATP binds to myosin)
muscle contraction step 12
Myosin re-extends into "ready" position (ATP->ADP+Pi)(ADP is bound to myosin)