Cell Membrane
The cell membrane is a thin layer of molecules that encases the cell and separates it from the external environment. It is a selectively permeable barrier that regulates what enters and exits the cell, controlling both the movement of substances and the communication between the cell and its environment. It is composed of phospholipids, proteins, and cholesterol, and helps maintain the cell’s identity, shape, and integrity. The cell membrane is essential for allowing the cell to take in nutrients, protect against foreign substances, and exchange information with its environment. It is an important part of many biological processes, including cell growth and development, signal transduction, and cell metabolism.
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