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 protein on the cell membrane.
  2. A second messenger transmits the signal into the cell, eliciting a physiological response.

In either step, the signal can be amplified. Thus, one signalling molecule can cause many responses.

Read more about Signal Transduction:  History, Environmental Stimuli, Receptors, Cellular Responses, Major Pathways

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Famous quotes containing the word signal:

    A signal is comprehended if it serves to make us notice the object or situation it bespeaks. A symbol is understood when we conceive the idea it presents.
    Susanne K. Langer (1895–1995)