The unique structure of the cell membrane allows small substances (like oxygen or carbon dioxide) to easily pass through.
The part of a cell that prevents some substances or controls what comes into and out of a cell is what we call CELL WALL. cell wall is present in both animal and plant cell. It also provides and maintain the shape of the cell and serves as a protective barrier.
The Cell Wall
Support: The cell wall provides mechanical strength and support. It also controls the direction of cell growth.
Withstand turgor pressure: Turgor pressure is the force exerted against the cell wall as the contents of the cell push the plasma membrane against the cell wall. This pressure helps a plant to remain rigid and erect, but can also cause a cell to rupture.
Regulate growth: The cell wall sends signals for the cell to enter the cell cycle in order to divide and grow.
Regulate diffusion: The cell wall is porous allowing some substances, including proteins, to pass into the cell while keeping other substances out.
Communication: Cells communicate with one another via plasmodesmata (pores or channels between plant cell walls that allow molecules and communication signals to pass between individual plant cells).
Protection: The cell wall provides a barrier to protect against plant viruses and other pathogens. It also helps to prevent water loss.
Storage: The cell wall stores carbohydrates for use in plant growth, especially in seeds.
i think the cell membrane
it also provides and maintain the shape of the cell. And it can only be found at plant cells.
Cell membrane allows some substances to enter and leave the cell, while stopping other substances