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Calcium is essential for muscle contraction. Why?

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It binds to G-actin and enables cross bridge formation

It activates myosin ATPase by binding to it

It is stored in sarcoplasmic reticulum

It binds to a subunit of troponin and causes unmasking of active site on actin.

answer is D.

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Detailed Solution

$C a^{+ +}$ binds to Tnc of troponin and causes unmasking of active site on G-actin. This enables cross bridge formation.

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