Q.

Calcium is important in muscle contraction because it

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a

is the direct source of energy to the muscles

b

helps in unmasking of active sites

c

acts as an oxygen reservoir

d

helps in masking of active sites 

answer is C.

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Detailed Solution

Binding of calcium ions to the TnC subunit of troponin unmasks active sites allowing the myosin heads to bind with actin to form cross bridges.

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