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12 terms

Steps to Muscle Contraction

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