During muscle contraction, increase in calcium level leads to the binding of calcium with a subunit of A on B filaments and thereby remove the masking of active sites for C.
Choose the option which correctly fill the blanks.
A B C
(1) Troponin Myosin Actin
(2) Tropomyosin Troponin Actin
(3) Troponin Actin Myosin
(4) Meromyosin Myosin Actin

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answer is C.

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Detailed Solution

During muscle contraction, increase in calcium level leads to the binding of calcium with a subunit of troponin on thin (actin) filaments and thereby remove the masking of active sites for myosin.

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	A	B	C
(1)	Troponin	Myosin	Actin
(2)	Tropomyosin	Troponin	Actin
(3)	Troponin	Actin	Myosin
(4)	Meromyosin	Myosin	Actin