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WordNet-Online
Definitions from WordNet
Noun cell membrane has 1 sense
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Definitions from the WebCell MembranesCell membranes are thin, flexible barriers that surround cells, acting as a protective outer layer and regulating the movement of molecules in and out of the cell. In its primary sense, the term "cell membranes" refers to the phospholipid bilayer that forms the basic structure of membranes in all cells. This lipid bilayer consists of two layers of phospholipids, with their hydrophobic (water-repelling) tails on the inside and their hydrophilic (water-attracting) heads facing outward. It is embedded with proteins that perform various functions such as transporting ions and molecules, cell signaling, and cell adhesion. Cell membranes also play a crucial role in maintaining cell homeostasis by selectively allowing certain substances to enter or exit the cell, through various mechanisms like diffusion, osmosis, and active transport. Sample sentences:
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