Calmodulin acts by
Calmodulin contains myosin light-chain kinase, which phosphorylates myosin and phosphorylase kinase which activates phosphorylase.(Ref: Textbook of physiology AK JAIN 5th edition page no.20)
Opening of Na+ channels
Phosphorylation of myosine by protein kinase
Activation of Na+-K+ pump
Dephosphorylation by protein kinase
General physiology