Cellular Biology Cell Membrane
The cell membrane, also known as the plasma membrane, is a semipermeable barrier that surrounds the cytoplasm of a cell. It consists of a double layer of phospholipids embedded with proteins, cholesterol, and carbohydrates. The cell membrane regulates the passage of substances in and out of the cell, maintains cell shape and integrity, and facilitates cell communication with the external environment. It plays a crucial role in various cellular processes such as cell signaling, adhesion, and transport.