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For example, plasma membrane proteins carry out functions as diverse as ferrying nutrients across the plasma membrane, receiving chemical signals from outside the cell, translating chemical signals into intracellular action, and sometimes anchoring the cell in a particular location (Figure 4).
Up until now, we have talked a lot about the structure of different membranes found throughout, or around, the cell. We have also mentioned the fact that one very important function of any membrane is to control, or regulate, what gets into and out of a cell or organelle.In this final section on membranes, we will spend a good deal of time discussing the details of membrane transport.n the end, it is clear that the transport of materials across cell membranes is a critically important function of those membranes. Without such transport, cells and the organisms they comprise would quickly die. And we would not want that.