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Oct 19, 2020 · Definition. The cell membrane, also known as the plasma membrane, is a double layer of lipids and proteins that surrounds a cell. It separates the cytoplasm (the contents of the cell) from the external environment. It is a feature of all cells, both prokaryotic and eukaryotic.
Meaning. Cell membrane. Specialized structure that surrounds the cell and its internal environment; controls movement of substances into/out of cell. Hydrophobic. Molecule that repels water (“water-fearing”) Hydrophilic. Molecule that is attracted to water (“water-loving”) Amphipathic.
Cell membranes protect and organize cells. All cells have an outer plasma membrane that regulates not only what enters the cell, but also how much of any given substance comes in. Unlike...
The cell membrane is an extremely pliable structure composed primarily of two layers of phospholipids (a “bilayer”). Cholesterol and various proteins are also embedded within the membrane giving the membrane a variety of functions described below.
4.1: Membrane Structure and Composition. Since most cells live in an aqueous environment and the contents of the cell are also mostly aqueous, it stands to reason that a membrane that separates one side from the other must be hydrophobic to form an effective barrier against accidental leakage of materials or water.
membrane, in biology, the thin layer that forms the outer boundary of a living cell or of an internal cell compartment. The outer boundary is the plasma membrane, and the compartments enclosed by internal membranes are called organelles.
Cell membrane. Cell signaling pathways. Cell-cell junctions. Cellular structure and function. Cytoskeleton and intracellular motility. Endocytosis and exocytosis. Extracellular matrix. Nernst equation. Osmosis. Resting membrane potential. Selective permeability of the cell membrane. Disorders of cellular biology. Alport syndrome.
