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plasma membrane the boundary between the cell and it's environment, to allow a steady supply of these nutrients to come into the cell no matter what the external conditions are homeostasis the process of maintaining the cell's environment selective permeability a process in which the plasma membrane of a cell allows some molecules into the cell while keeping others out phospholipids lipids with a phosphate group attached to them fluid mosaic model model of the plasma membrane transport proteins allows needed substances or waste materials to move through the plasma membrane