Cell Membrane
Definition
A cell membrane is a thin, flexible layer that surrounds the cell, defining its boundaries and protecting its contents.
Scientific / Technical Definition
The cell membrane, also known as the plasma membrane, is a biological membrane that separates the interior of all cells from the outside environment. It is primarily composed of a lipid bilayer with embedded proteins, which enables it to be selectively permeable to ions and organic molecules, facilitating cellular transport and communication.
Benefits
- Regulates the movement of substances in and out of the cells, maintaining cellular homeostasis.
- Provides a barrier to protect cellular components from the external environment.
- Facilitates cell communication through receptor molecules.
- Helps in cell signaling and interaction with other cells.
Examples
- Cell membranes are present in all living cells, including animal cells, plant cells, and bacterial cells.
- Phospholipids, cholesterol, and proteins are key components found in the cell membrane.
Additional Information
- importance: Cell membranes are crucial for maintaining the structural integrity of the cell and for mediating interactions between the cell and its external environment. They play a vital role in nutrient absorption and waste removal, which is closely linked to cellular hydration and function.
References
Last updated: 10/26/2024