The cell membrane separates the interior of cells from the housed environment. In humans and all eukaryotes, cell membranes are composed of a phospholipid bilayer. This allows membranes to be selectively permeable to ions and organic molecules and control their movement in and out of cells.
Cell membranes are involved in cell adhesion, ion conductivity and cell signaling.
cell membrane A very thin membrane, composed of lipids and protein, that surrounds the cytoplasm of a cell and controls the passage of substances into and out of the cell.
eukaryote any cell or organism that possesses a clearly defined nucleus, unlike bacteria. Eukaryotes include yeast, fungus, plants, and animals.
cell membrane A very thin membrane, composed of lipids and protein, that surrounds the cytoplasm of a cell and controls the passage of substances into and out of the cell.
membrane The word "membrane" can have different meanings in different fields of biology. In cell biology, a membrane is a layer of molecules that surround its contents. Examples of cell-biology membranes include the "cell membrane" that surrounds a cell, the "mitochondrial membranes" that form the outer layers of mitochondria, and the "viral envelope" that surrounds enveloped viruses. In anatomy or tissue biology, a membrane is a barrier formed by a layer of cells. Examples of anatomical membranes include the pleural membranes that surrounds the lungs, the pericardium which surrounds the heart, and some of the layers within the blood-brain barrier.
cell membrane A very thin membrane, composed of lipids and protein, that surrounds the cytoplasm of a cell and controls the passage of substances into and out of the cell.
