Signal Transduction
Signal transduction occurs when an extracellular signaling molecule activates a cell surface receptor. In turn, this receptor alters intracellular molecules creating a response. There are two stages in this process:
1. A signaling molecule activates a specific receptor on the cell membrane
2. Causing a second messenger to continue the signal into the cell and elicit a physiological response.
In either step, the signal can be amplified. Thus, one signalling molecule can cause many responses.
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