Which one of the following ions is essential for muscelar contration ?

Which one of the following ions is essential for muscelar contration ?
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Which one of the following ions is essential for muscelar contration ? A. `Na^(+),Ca^(++)` B. `Mg^(++), Ca^(++)` ... (++), K^(+)` D. `K^(+) , Na^(+)`
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