Question

action of adrenaline (second messenger model), what does it result in?. messengers

Accepted Answer

triggers liver cells (hydrophilic hormone, so binds with receptors on membrane and triggers chain reaction within cell) to undergo glycogenolysis to increase blood glucose levels for more respiration and muscle contraction
once bound, adenylyl cyclase activated (enzyme) which triggers conversion of ATP into cAMP on inner surface of membrane in cytoplasm, cAMP activates protein kinases (enzymes) which phosphorylate (and so activate) other enzymes (which break down glycogen into glucose here)
In model, hormone (adrenaline here) is first messenger and cAMP second messenger

Messenger Triggers Camp Membrane Glucose Action Adrenaline Model