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  1. www.britannica.com · science · cell-membraneCell membrane | Definition, Function, & Structure | Britannica

    3 days ago · Learn about the cell membrane, a thin layer of lipids and proteins that surrounds every living cell and regulates its interactions with the environment. Find out how the cell membrane acts as a barrier, a gate, and a transport system for the cell.

    • Membrane

      membrane, in biology, the thin layer that forms the outer...

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  3. en.wikipedia.org · wiki · Cell_membraneCell membrane - Wikipedia

    The cell membrane is a biological membrane that separates and protects the interior of a cell from the outside environment. It consists of a lipid bilayer with membrane proteins and glycolipids, and controls the movement of substances in and out of a cell.

  4. biologydictionary.net · cell-membraneCell Membrane - The Definitive Guide - Biology Dictionary

    • Definition
    • Function of The Cell Membrane
    • Phospholipid Bilayer
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    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.

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    The cell membrane gives the cell its structure and regulates the materials that enter and leave the cell. It is a selectively permeable barrier, meaning it allows some substances to cross, but not others. Like a drawbridge intended to protect a castle and keep out enemies, the cell membrane only allows certain molecules to enter or exit.

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    The cell membrane is made up of a phospholipid bilayer. Phospholipids are lipid molecules made up of a phosphate group head and two fatty acid tails. Importantly, the properties of phospholipid molecules allow them to spontaneously form a double-layered membrane. The phosphate group head of a phospholipid is hydrophilic, whereas the phospholipid ta...

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    The cell membrane is a selectively permeable barrier that regulates the materials that enter and leave the cell. It is made up of a phospholipid bilayer and various lipids and proteins that enable it to carry out functions such as diffusion, endocytosis, exocytosis and signaling.

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  5. www.nature.com · scitable · topicpageCell Membranes | Learn Science at Scitable - Nature

    Learn how cell membranes are made of lipids and proteins that regulate what enters and exits the cell. Explore the roles of membrane transport, receptor and enzyme proteins in cell communication and metabolism.

  6. www.britannica.com · science · membrane-biologyMembrane | Definition, Structure, & Functions | Britannica

    Aug 26, 2024 · Membrane is the thin layer that forms the outer boundary of a living cell or of an internal cell compartment. It has three primary functions: to keep toxic substances out, to allow specific molecules to pass, and to separate metabolic processes.

    • The Editors of Encyclopaedia Britannica

  7. www.thoughtco.com · cell-membrane-373364Cell Membrane Function and Structure - ThoughtCo

    Jun 7, 2024 · The cell membrane (plasma membrane) is a thin semi-permeable membrane that surrounds the cytoplasm of a cell. Its function is to protect the integrity of the interior of the cell by allowing certain substances into the cell while keeping other substances out.

  8. openstax.org · pages · 3-1-the-cell-membrane3.1 The Cell Membrane - Anatomy and Physiology 2e - OpenStax

    As the outer layer of your skin separates your body from its environment, the cell membrane (also known as the plasma membrane) separates the inner contents of a cell from its exterior environment. This cell membrane provides a protective barrier around the cell and regulates which materials can pass in or out.

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