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Reianna Shakil L6EFBiology9/11/12

Cell signalling
A cell must stay in contact with its environment and with other cells in order
to survive.
Cells must be able to react to change in their environment. In a multicellular
organism, cells in one part of the body must be able to communicate with…

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Reianna Shakil L6EFBiology9/11/12

Figure 2.5 shows three different ways in which cell signalling can occur. In Figure 2.5a, the
signal is a chemical that attaches to a protein or glycoprotein acting as an ion channel. When
the chemical attaches to the receptor, it makes the channel open and let ions…


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