Cell Membrane (Noun)
Meaning
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".
Classification
Nouns denoting body parts.
Examples
- The cell membrane is a thin layer of lipid and protein molecules that surrounds the cytoplasm of a cell and regulates the movement of materials in and out.
- The cell membrane is semi-permeable, allowing certain substances to pass through while keeping others out.
- Proteins embedded in the cell membrane act as receptors, helping the cell to respond to signals from the environment.
- The cell membrane plays a crucial role in maintaining the internal environment of the cell by controlling the passage of ions and molecules.
- All living cells, from bacteria to humans, have a cell membrane that separates the cell from its surroundings.