Explain plasma membrane, cell membrane, selectively permeable membrane and semipermeable membrane. Is there any difference among them or all of them are the synonyms of each other?

Cell Wall: The cell wall is dead and freely impermeable.

As the cell wall is dead, cells cement together and anchor the cellulose fibers of the cell wall giving it a rigid and woody structure. Cell wall shows hydrophobic properties, that they can't mix with water and are impermeable.

According to few research studies, these cell walls have certain binders and channels that allow the movement of few molecules upon another.

Although, water, oxygen, and carbon dioxide move freely across the cell due to differences in gradient.

The plasma membrane (Cell membrane) is called selectively permeable because it regulates the movement of substances in and out of the cell.  It means that the plasma membrane permits some material to pass through it while at the same time it blocks other material from entering through it.

A semipermeable membrane is a biological live or artificial synthetic polymeric membrane that is permeable to only certain molecules and not to all molecules which means they allow certain molecules or ions to pass through it by a simple process of diffusion.

Semipermeable membrane involves the simple process of diffusion while selectively permeable membrane involves the channels or ions that allow the selected materials to pass through them.

[Extra information:

Semipermeable can be both, biological and artificial.

1. Artificial Semipermeable Membranes: It includes a variety of material that is designed for the purposes of filtration, for example for reverse osmosis, which allows water to pass through it excluding salt ions. Another example is dialysis tubing.

2. Biological Semipermeable Membranes: It includes the cell membranes of living organisms that act similar to a simple semipermeable membrane, allowing water to pass through them except solutes.]


Simply Easy Learning

Updated on: 16-Jan-2023


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