A) Mg
B) Na
C) K
D) Ca.
Correct Answer: D
Solution :
:\[C{{a}^{2+}}\]is involved in the initiation of contraction of smooth muscle and also in skeletal muscle. However, visceral smooth muscle generally has a poorly developed sarcoplasmic reticulum, and the increase in intracellular\[C{{a}^{2+}}\]concentration is due primarily to\[C{{a}^{2+}}\]influx from the ECF. The\[C{{a}^{2+}}\]binds to calmodulin, and the resulting complex activates calmodulin-dependent myosin light chain kinase. This enzyme catalyses the phosphorylation of the myosin light chain, which allows the myosin ATPase to be activated, and actin slides on myosin, producing contraction.
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