The cell membrane has multiple functions in a cell.
1. It acts as a barrier: The cell membrane separates the cell from its external environment, controlling the movement of molecules in and out of the cell. It regulates the entry and exit of various substances, ensuring a stable environment within the cell.
2. Selective permeability: The cell membrane is selectively permeable, meaning it allows some substances to pass through while preventing the entry or exit of others. This enables the cell to maintain its internal balance and control the movement of essential molecules like nutrients, ions, and gases.
3. Communication: The cell membrane contains proteins that are involved in cell-cell signaling and communication. These proteins can receive signals from other cells or the external environment and transmit them to the interior of the cell, initiating various cellular responses.
4. Structural support: The cell membrane provides structural support and shape to the cell. It gives the cell its characteristic boundary and shape, keeping the underlying cytoplasm and organelles in place.
5. Cell recognition and adhesion: The cell membrane contains molecules, such as glycoproteins and glycolipids, that are involved in cell recognition and adhesion. These molecules enable cells to recognize and interact with each other, facilitating processes like cell adhesion, immune responses, and tissue formation.
Overall, the cell membrane plays a crucial role in maintaining the integrity, homeostasis, and functionality of the cell by controlling the movement of molecules, facilitating communication, providing structural support, and participating in cell recognition and adhesion processes.
What is does the cell membrane do for the cell?
Hold DNA
Allows molecules in and out of cell
Makes proteins
Holds organelles in place
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