1.

Which of the following are involved in muscle contraction?

A. \[C{{a}^{2+}}andM{{g}^{2+}}\]    
B.                    \[C{{a}^{2+}}andN{{a}^{+}}\]    
C. \[N{{a}^{+}}and{{K}^{+}}\]           
D. \[M{{g}^{2+}}and{{K}^{+}}\]
Answer» B.                    \[C{{a}^{2+}}andN{{a}^{+}}\]    


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