Plasma Membrane

Definition

The plasma membrane is a protective layer around cells, controlling what enters and leaves the cell. It helps maintain a stable internal environment.

Scientific / Technical Definition

The plasma membrane, also known as the cell membrane, is a lipid bilayer composed of phospholipids, proteins, and carbohydrates. It functions as a selective barrier, regulating the transport of nutrients, ions, and waste products in and out of the cell and facilitating communication and structural support.

Benefits

• Maintains cell integrity and functionality
• Regulates nutrient and water transport
• Facilitates communication between cells

Examples

• All living cells, such as human, plant, and bacterial cells, have plasma membranes.

Additional Information

• Importance: The plasma membrane is crucial for hydrating cells by controlling the movement of water and electrolytes, facilitating cellular hydration and overall fluid balance in the body.

Related Terms

• Cell Membrane
• Lipid Bilayer
• Hydration
• Homeostasis

References

• The structure and function of the plasma membrane.
• Cell Membranes: Structure, Function, and Relevance to the Immune System.