What is cell membrane?
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The cell membrane is the semipermeable membrane of a cell that surrounds and encloses its contents of cytoplasm and nucleoplasm. The cell membrane separates the cell from the surrounding interstitial fluid, the main component of the extracellular fluid.
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Cell Membrane is present in all organisms including plants
The cell membrane is also known as the plasma membrane. It is the outermost covering of animal cells. It is a semi-permeable membrane composed of lipids and proteins. The main functions of the cell membrane include:
- Protecting the integrity of the interior cell.
- Providing support and maintaining the shape of the cell.
- Helps in regulating cell growth through the balance of endocytosis and exocytosis.
- The cell membrane also plays an important role in cell signalling and communication.
- It acts as a selectively permeable membrane by allowing the entry of only selected substances into the cell.
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