system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Second messenger is/are:
assistant
The correct answer is  Ans: a. Ca2+ [Ref Harper 30th/501, 91-92, 179, 343; Lippincott 6th/94-951Nucleotides, such as cyclic adenosine mono-phosphate (cAMP) and cyclic guanosine monophosphate (cGMP), serve as second messengers in signal transduction pathways.Two of the most widely recognized second messenger systems are the calciumlphosphatidy linositol system, and the adenylyl cyclase system, which is paicularly impoant in regulating the pathways of intermediary metabolism.