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Q.

Regulatory proteins of myofibril are

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a

Actin and troponin

b

Myosin and tropomyosin

c

Troponin and tropomyosin

d

Actin and myosin

answer is D.

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Detailed Solution

Troponin and tropomyosin are responsible for exposing the active sites of actin so that cross bridges are formed causing shortening  of sarcomere. 

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Regulatory proteins of myofibril are