plasma membrane

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plasma membrane

A student examines a diagram of a plasma membrane in a biology textbook.

Definition
  1. Noun:
    • A thin biological membrane that encloses the cytoplasm of a cell: The plasma membrane is a fundamental, semi-permeable barrier that separates the interior of a cell from its external environment. It is primarily composed of a double layer of lipids (phospholipids) and contains various proteins that regulate the cell's interactions and transport.
Usage
  • The term "plasma membrane" is used in cell biology to describe the outer boundary of a cell. It is a technical term synonymous with "cell membrane." It is used to discuss its structure, function, and role in cellular processes like signaling and transport.
Examples
  • Noun:
    • The plasma membrane controls the movement of substances into and out of the cell.
    • Proteins embedded in the plasma membrane act as channels or receptors.
    • Damage to the plasma membrane can lead to cell death.
Advanced Usage
  • "Fluid mosaic model": This is the scientific model describing the structure of the plasma membrane, emphasizing that it is a fluid bilayer of lipids with proteins mosaiced within it.
    • The fluid mosaic model explains the dynamic nature of the plasma membrane.
Variants and Related Words
  • Cell membrane (n): A direct synonym for plasma membrane.
    • The cell membrane is essential for maintaining cellular homeostasis.
  • Cytoplasmic membrane (n): Another less common synonym.
  • Phospholipid bilayer (n): Refers specifically to the double-layered lipid structure that forms the core foundation of the plasma membrane.
    • The phospholipid bilayer is a key component of the plasma membrane.
Synonyms
  • Cell membrane: The most common synonym.
  • Biological membrane: A broader term that includes the plasma membrane and internal cellular membranes.
Related Phrases
  • Membrane protein: A protein associated with or embedded in the plasma membrane.
    • Ion channels are a type of membrane protein in the plasma membrane.
  • Selective permeability: A key property of the plasma membrane, allowing only certain substances to pass through.
    • The plasma membrane exhibits selective permeability.
plasma membrane

A student examines a diagram of a plasma membrane in a biology textbook.

Noun
  1. a thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell
    • all cells have a cell membrane

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