Which of the following is an example of a second messenger?

Question

Quizplus · Accepted Answer

Cyclic adenosine monophosphate (cAMP) is a second messenger that is produced after the binding of a ligand (such as a hormone or neurotransmitter) to a receptor on the cell membrane. cAMP then activates various intracellular signaling pathways to initiate a cellular response. Sodium (A) is an ion that is important for cellular communication and action potentials, but it is not a second messenger. G-proteins (B) are involved in the transduction of a signal from a receptor to an effector molecule, but they are not themselves second messengers. Acetylcholine (C) is a neurotransmitter used by the parasympathetic nervous system. While it can activate receptors and initiate intracellular signaling, it is not a second messenger.

Which of the Following Is an Example of a Second