Selective permeability



A feature and a function of the plasma membrane that is essential to maintain homeostasis by regulating the passage of some substances while preventing others from entering the cell


The plasma membrane is capable of being selectively permeable because of its structure, which is composed of a bilayer of hydrophobic phospholipids, and proteins that act as transporters or channels for certain molecules (e.g. ions).

See also: fluid mosaic model, plasma membrane.

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