Cell Membrane
A cell structure that controls which substances can enter or leave the cell.
The cell membrane, also known as the plasma membrane, is a thin, semi-permeable layer that encloses the cytoplasm of cells. The membrane is made up of a phospholipid bilayer, which consists of two layers of phospholipids arranged in a way that allows them to form a barrier between the interior and exterior of the cell.
The cell membrane is a vital component of the cell because it performs several important functions, including:
1. Regulating the movement of substances into and out of the cell: The cell membrane is selectively permeable, which means that it allows certain substances to pass through it while preventing others from entering or leaving the cell.
2. Maintaining cell shape and structure: The membrane helps to maintain the shape of the cell and provides structural support.
3. Participating in cell communication: The membrane contains receptors that allow cells to communicate with each other.
4. Acting as a barrier to harmful substances: The membrane helps to protect the cell from harmful substances that could potentially damage it.
The cell membrane also contains various proteins, including transport proteins, enzymes, and receptor proteins, that play important roles in the functioning of the cell. Overall, the cell membrane is a critical component of the cell that allows it to function properly and survive in its environment.
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