This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Function of CAMP 
Select and explain. 
A. Ion exchange, B. Activation of protein kinase, C. Activation of Ryanodine receptors, D. Release of acetylcholine
B: Activation of protein kinase
Answer: B: Activation of protein kinase 
Explanation: 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