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The contractile regulatory proteins that mask and unmask active sites in the sarcomere are a) troponin and tropomyosin b) troponin and myosin c) actin and myosin d) troponin and troponinc .correct option is c can you explain this question?
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The contractile regulatory proteins that mask and unmask active sites ...
The contractile regulatory proteins that mask and unmask active sites in the sarcomere are troponin and tropomyosin. 
The two tropomyosin filaments run close to the actin filaments throughout its length.
The troponin units are distributed throughout the length of tropomyosin filaments and mask the active binding sites for myosin.
During muscle contraction, the increased calcium ion levels lead to their binding to a subunit of troponin and unmasking the active sites for myosin filaments.
So, the correct option is 'Troponin and tropomyosin
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The contractile regulatory proteins that mask and unmask active sites in the sarcomere are a) troponin and tropomyosin b) troponin and myosin c) actin and myosin d) troponin and troponinc .correct option is c can you explain this question?
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