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  1. Which ion is essential for muscle contraction?
    1. Na
    2. K
    3. Ca
    4. Cl
Correct Option: C

Movement of Ca2+ out in sarcoplasmic reticulum controls the making and breaking of actin and myosin complex actomyosin due to which muscle contraction and relaxation takes place. Albert Szent Gyorgyi worked out biochemical events of muscle contraction.


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