Give an example of diffusion across plasma membrane.
Diffusion is the process of movement of molecules from a region of high concentration to a region of lower concentration until an equilibrium is reached.
When concentration of gases such as CO2 gets high in the cell as compared to the external environment, then CO2 moves out of the cell by the process of diffusion via plasma membrane. Similarly, O2 enters the cell by the process of diffusion when its concentration is reduced in the cell.
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