Cell membrane | Definition, Function, & Structure | Britannica
WEBMar 27, 2024 · Cell membrane, thin membrane that surrounds every living cell. The cell membrane functions as a barrier, keeping cell constituents in and unwanted substances out, and as a gate, allowing transport into the cell of essential nutrients and movement from the cell of waste products.
Cell membrane - Wikipedia
WEBThe cell membrane (also known as the plasma membrane or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates and protects the interior of a cell from the outside environment (the extracellular space).
Cell Membrane - The Definitive Guide | Biology Dictionary
WEBOct 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.
Structure of the plasma membrane (article) | Khan Academy
WEBThe plasma membrane not only defines the borders of the cell, but also allows the cell to interact with its environment in a controlled way. Cells must be able to exclude, take in, and excrete various substances, all in specific amounts.
Cell Membranes | Learn Science at Scitable - Nature
WEBCell 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...
3.1 The Cell Membrane – Anatomy & Physiology - Open …
WEBThe 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.
The cell membrane review (article) | Khan Academy
WEBMeaning. 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 …
Plasma membrane and cytoplasm (article) | Khan Academy
WEBThe plasma membrane is the border between the interior and exterior of a cell. As such, it controls passage of various molecules—including sugars, amino acids, ions, and water—into and out of the cell. How easily these molecules can cross the membrane depends on their size and polarity.
Membrane | Definition, Structure, & Functions | Britannica
WEBmembrane, 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: Video, Anatomy, Definition & Function | Osmosis
WEBCell 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.
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