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  • Cell Signalling
    • Why?
      • So the cell can stay in contact with its environment and with other cells
      • enables them to react to changes in their environment
      • very useful in multicellular organisms
    • The Process
      • Signals arrive at the plasma membrane from outside the cell as particular substances
        • e.g. a hormone or changes in electrical potential
        • A receptor in the cell's plasma membrane picks up these signals, and brings about actions within the cell. This process is known as cell signalling
    • 3 ways cell signalling can occur
      • 1 - Receptor acts as an ion channel
        • the signal is a chemical that attcahes to a protein or glycoprotein acting as an ion channel


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