When catecholamine or peptide hormone binds to receptors on the surface of a cell - a second messenger appears in the cytoplasm.
Protein and peptide hormones, catecholamines such as epinephrine, and eicosanoids have their receptors present on the plasma membrane of target cells.
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The binding of the hormone to the hormone receptor initiates a series of events or cascade reactions.
- It results in the production or release of a second messenger within the cell.
- This second messenger occurs in the cytoplasm of the target cell that triggers a set of molecular interactions to carry out a specific response or function.
Thus, when catecholamine or peptide hormone binds to receptors on the surface of a cell - a second messenger appears in the cytoplasm.
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