One primary function of the cell membrane is regulating the flow of simple sugars into or out of the cell.
Cells are separated from the environment that surrounds them by a thin sheet called the plasma membrane, which defines their boundaries.
The plasma membrane constitutes selectively permeable barriers, since they prevent the indiscriminate exchange of substances between the cytoplasm and the extracellular medium.
Thanks to its physicochemical properties, it is capable of transporting certain solutes, macromolecules such as sugars and macromolecular complexes from one side to the other.
For example, glucose (sugar) for its entry into the cell requires a transporter protein in the cell membrane.
Cell membrane transporter proteins carry out coupled transport, in which sodium and glucose — or galactose, in some cases — enter the cell together.
In this way, the membrane acts as a barrier that prevents the passage of most of the substances, with specific mechanisms such as transporter proteins to achieve the entry of nutrients.
Therefore, we can conclude that one primary function of the cell membrane is regulating the flow of simple sugars into or out of the cell.
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