<prompt> Calmodulin acts byOpening of Na channelsPhosphorylation of myosine by protein kinaseActivation of Na-K pumpDephosphorylation by protein kinase  <response>: 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 