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.
Membrane - Wikipedia
WebBiological membranes include cell membranes (outer coverings of cells or organelles that allow passage of certain constituents); [2] nuclear membranes, which cover a cell nucleus; and tissue membranes, such as mucosae and serosae.
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 is …
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.
Structure of the plasma membrane (article) | Khan Academy
WebThe principal components of the plasma membrane are lipids (phospholipids and cholesterol), proteins, and carbohydrate groups that are attached to some of the lipids and proteins. A phospholipid is a lipid made of glycerol, two fatty acid tails, and a phosphate-linked head group.
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 | 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.
Structure, Properties and Function - Biology LibreTexts
WebThumbnail: The cell membrane, also called the plasma membrane or plasmalemma, is a semipermeable lipid bilayer common to all living cells. It contains a variety of biological molecules, primarily proteins and lipids, which are involved in …
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.
Cell membrane: Video, Anatomy, Definition & Function | Osmosis
WebContributors. The cell membrane is an important structural element of the building block of life - the cell. Its main role is to define what’s inside - the intracellular space - and what’s outside - the extracellular space. It also regulates what comes in or out of the cell - that’s called selective permeability.
Skip to content