Calmodulin acts by: (A) Opening of Na+ channels, (B) Phosphorylation of myosine by protein kinase, (C) Activation of Na+-K+ pump, (D) Dephosphorylation by protein kinase
Answer is B. 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)