Why are Actin and Myosin called "contractile proteins"?
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Calcium then binds to troponin on actin filaments and exposes the active sites for myosin. Myosin binds to the exposed active site on actin using energy from the hydrolysis of ATP. This pulls the actin towards the centre. The Z lines attached to these are also pulled, and contraction occurs
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calcium then binds to troponin on actin filament and exposes the active sites for myosin .myosin binds to the exposed active site on actin using energy from the hydrolysis of ATP.this pulls the actin towards the center .The Z line attached to these are also pulled, and contraction occurs .
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