Question

Which one of the following sets of ions is necessary for chemical events for muscle contraction?

• A. $C{a}^{+}andM{g}^{++}$
• B. $K^{+}andN{a}^{+}$
• C. $K^{+}andC{a}^{+}$
• D. $N{a}^{+}andF{e}^{+++}$

Answer 1

The correct option is A $C{a}^{+}andM{g}^{++}$

• The muscle contraction cycle is triggered by calcium ions binding to the protein complex troponin, exposing the active-binding sites on the actin.
  
• ATP then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.

So, the correct option is '$C{a}_{+}$ and $Mg++$'.