Muscle Contraction 0.0 / 5 ? BiologyHuman, animal and plant behaviourA2/A-levelEdexcel Created by: Ellie HadleyCreated on: 17-01-14 18:01 Actin Protein filament that forms part of the acto-myosin bridge 1 of 7 Myosin Protein filament that forms part of the acto-myosin bridge, has a head that binds to actin and has different positions 2 of 7 Tropomyosin A protein that covers the binding site on actin 3 of 7 Troponin A protein that pulls the tropomyosin away from the binding site 4 of 7 ATP Provides energy that releases the myosin head from the actin 5 of 7 ATPase Enzyme that breaks down ATP and releases energy 6 of 7 Calcium Ions Initiates contraction and bind to troponin, exposing the binding sites 7 of 7
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