California Polytechnic State University, San Luis Obispo

Separates the inside of the cell from its environment using a lipid bilayer.

Cell Membrane

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

Lipid Bilayer

The ability of cell membranes to allow certain substances to enter and exit the cell while blocking other substances. The blockage of other ions is enabled by a selectivity filter inside ion channels like the potassium (K+) ion channel, which contains oxygen atoms in its interior that easily escort K+ ions but have difficulty escorting other ions. 

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