What is a membrane?

A membrane is a selective barrier or fencing, that allows some things to pass through but stops others such as, molecules, ions, or other small particles. 

Biological membranes include cell membranes, nuclear membranes, which cover a cell nucleus, and tissue membranes.

In the cell, the plasma membrane or cell membrane protects the cell from its surroundings.


The cell membrane is also known as the "plasma membrane". It is the outermost layer or the boundary of a cell. It separates the cell from the external environment. The cell membrane is a porous structure that allows only the useful substances to enter the cell and not the unwanted materials. Hence, the cell membrane is also termed as a selectively permeable membrane.


Simply Easy Learning

Updated on: 09-May-2023


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