depend on the kind of cell......
plant: cell wall and cell membrane/plasma membrane
animal: cell membrane/plasma membrane
double layer phospholipids forms boundary between cell and surrounding environment and controls passage of materials into and out of cell
The cell membrane controls what enters and exits a cell.
the cell membrane
The cell membrane, also known as the plasma membrane, controls the movement of materials into and out of all cells. It is a selectively permeable barrier that regulates the passage of substances in and out of the cell to maintain internal homeostasis.
The cell membrane regulates the movement of materials in and out of the cell through processes such as diffusion, osmosis, and active transport. Additionally, specific transport proteins embedded in the membrane facilitate the passage of certain molecules and ions.
the cell membrane
The plant cell's shape is maintained by its rigid cell wall made of cellulose. The movement of materials into and out of the cell is controlled by the cell membrane, which acts as a barrier and selectively regulates the passage of substances through active and passive processes.
The cell membrane, or plasma membrane, controls the entry and exit of materials into and out of the cell. This is done through selective permeability, which allows the membrane to regulate the passage of substances based on factors such as size, charge, and solubility. Transport proteins embedded in the membrane also play a key role in facilitating the movement of specific molecules across the membrane.
M for membrane I would suppose.
semipermeable cell membrane
cell membrane
The Plasma Membrane