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Troponin Unblock Actin?  Ca Binds Troponin Tropomyosin  Complex Shifts

Calcium binding to troponin causes a shift in the troponin-tropomyosin complex, exposing the active sites on actin for myosin binding.

1. Ca binds to troponin, troponin-tropomyosin 2. complex shifts such that active sites on actin become exposed

Front How does troponin "unblock" actin? 
Back 1. Ca binds to troponin, troponin-tropomyosin 
2. complex shifts such that active sites on actin become exposed

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