- Secreted by the adrenal medulla in the adrenal glands.
- Is a first messenger (a molecule that bids to a receptor in the plasma membrane and causes changes to happen in the cell).
How does adrenaline work?-
1. Adrenaline is released into the blood by the adrenal medulla.
2. Adrenaline binds with receptors on its target cells, for example liver cells.
3. The G-protein is activated, and moves to the enzyme adenyl cyclase, which in turn is activated and produces cAMP (a second messenger) from ATP.
4. cAMP activates protein kinase, which prompts a series of reactions to produce glucose from glycogen (glycogenolysis).
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