what are the functions of plasma membrane?
Functions of Plasma membrane
- It protects intracellular organelles from the outside environment.
- It selectively allows the molecules to move in and out of the cell. Gases such as carbon dioxide and oxygen pass through diffusion, while other small molecules such as sugar pass through a process called passive transport. Ions such as sodium or potassium are transported through a process called active transport (with the utilization of ATP). Movement of water molecules through the membrane takes place by osmosis.
- It can also engulf or expel substances in and out of the cell through endocytosis or exocytosis respectively. Endocytosis is the process through which cells take in extra-cellular substances. Endocytosis represents both phagocytosis (ingestion of whole food),and pinocytosis (ingestion of water).
- It establishes communication between cells
The functions of cell membrane are as follows-
It is selectively permeable so it allows movement of certain materials inside the cell while restricts the movement of others. So it aids in maintaining the composition inside the cell.
It gives definite shape to the cell.
It protects the internal content of the cells.
the functions are.
1]it is important in survival of all living organisms.it not only protects the interior part of the cell but also protects to maintain the shape of the cell.
2]it protects and seperates the interior part of the cell from external environment.
3]act as a semipermiable membrane becaz it doesnot allow the entry of all molecules to the cell.
4]helps in exocytosis and endocytosis
5]in some cells it plays an important role in immunity
Plasma membrane holds the liquid cytoplasmic content,seperates it from the surroundings, serves asselective permeability barrier allowing inward movement of nutrientsand outward passage of waste products, wall materials etc. It holds recepter molecules for detection and responding to different chemicals of the surroundings.