Activation of one receptor begins a cascade process where one receptor gets activated and in turn activates another receptor which then triggers its own target. This continues until the aim is achieved. This whole process is known as signal transduction.
Receptor is a molecule that functions to receive a signal that may be in the form of another molecule also called the ligand. Receptors are usually proteinaceous in nature. It may be present embedded on the cell membrane or it may be soluble and present inside the cell.
Signal transduction is the process where a signaling molecule binds to the receptor and begins a series of reactions where one molecule activates the other and hence the target is achieved.
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