The selective permeability of the membrane is essential for the normal functioning of the cell because it maintains the internal order and functioning of the cell. Water, ions, glucose, and carbon dioxide may need to be imported or exported from the cell depending on its metabolic activity.
Along with this, the entry and exit of signaling molecules in the cell are also needed to be regulated. The presence of a selectively permeable membrane allows the cell to exercise control over the quantum, timing, and rate of movement of these molecules.
Plasma Membrane: It is a membrane that encloses all the constituents of the cell and separates them from the exterior environment. It is mainly made up of lipids and proteins.
Selective permeability of plasma membrane: The plasma membrane is selectively permeable in nature that is it allows entry and exit of only selected molecules in and out of the cell according to the requirements.
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