Which are involved in muscle contraction? (A) \( \mathrm{Ca}^{2+} \) and \( \mathrm{Mg}^{2+} \) ...

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Which are involved in muscle contraction?
(A) \( \mathrm{Ca}^{2+} \) and \( \mathrm{Mg}^{2+} \)
(B) \( \mathrm{Ca}^{2+} \) and \( \mathrm{Na}^{+} \)
(C) \( \mathrm{Na}^{+} \)and \( \mathrm{K}^{+} \)
(D) \( \mathrm{Mg}^{2+} \) and \( \mathrm{K}^{+} \)
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