sejtmembránt

Sejtmembrán is a term used in biology to describe the outer boundary of a cell, which separates the cell's internal environment from the external environment. It is a dynamic structure that allows the cell to regulate the movement of substances in and out, maintaining homeostasis. The sejtmembrán is composed of a phospholipid bilayer, which is fluid and semi-permeable, allowing certain molecules to pass through while restricting others. Embedded within the bilayer are proteins that facilitate various cellular processes, such as transport, signaling, and cell recognition. The sejtmembrán also contains carbohydrates that can serve as recognition sites for other cells. It is a crucial component of the cell's structure and function, playing a vital role in cell communication, growth, and division.