<prompt> Function of CAMPIon exchangeActivation of protein kinaseActivation of Ryanodine receptorsRelease of acetylcholine  <response>: CAMP is a secondary messager, used for intracellular signal transduction, such as transferring into cells the effect of hormones like glucagon etc.it is involved in activation of protein kinase Ref:Guyton and Hall textbook of medical physiology 12th edition,page number 540 ,541,542 