Adrenaline binds to a receptor on a liver cell, This forms a hormone-receptor complex, Inside the liver cell the enzyme adenylate cyclase is activated, This catalyses the conversion of ATP to cAMP, The Cyclic AMP formed is known as the second messenger, This second messenger binds to protein kinase, The protein kinase is activated and catalyses glycogenolysis, Blood glucose concentration increases.

Second Messenger Model

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