5.2 Cell Membranes and Signalling


Cell Signalling:

  • cells need to communicate with each other to contol processes inside the cell
  •  so they can respond to environmental changes
  • uses messenger molecules
    • the process
      • one cell releases a messenger molecule [e.g. hormone]
      • molecule travels to another cell [e.g. in the blood]
      • detected by binding to a receptor on the cell membrane
      • binding triggers a change in the cell [e.g. a series of chemical signals are set off]


Membrane Receptors:

  • cell membrane is important in the signalling process
  • protiens on the membrane act as receptors for messenger


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