Plasma Membrane

 

The plasma membrane, also known as the cell membrane, is a crucial structure in all living cells that separates the cell's interior from its external environment. It's a semipermeable barrier that regulates the movement of substances into and out of the cell, acting as a selective gateway for nutrients, waste, and other materials. 

Key Features and Functions:

·         Structure: Primarily composed of a phospholipid bilayer, with embedded proteins and carbohydrates. 

·         Selective Permeability: Allows the passage of certain molecules while preventing others, ensuring the cell's internal environment remains stable. 

·         Cellular Boundaries: Forms the outermost boundary of the cell, separating it from the outside world. 

·         Transport: Regulates the movement of substances across the membrane, both into and out of the cell. 

·         Communication: Plays a role in cell signaling and communication with other cells. 

·         Cell Shape and Stability: Helps maintain the cell's overall structure and shape.