What Are the Three Main Functions of the Plasma Membrane?

Published on 29-Jun-2022

Structure of plasma membrane:
The following are the structural components of the plasma membrane:

  • Lipid bilayer

It is composed of phospholipids. Each phospholipid is made up of one glycerol molecule, two non-polar fatty acid tails, and a polar phosphate head.

  • Membrane protein:

 The plasma membrane contains three types of proteins: I integral protein, which extends from one surface to another, (ii) peripheral protein, which is present on the plasma membrane's surface, and (iii) lipid combined protein, which is confined to the lipid's core.

  • Glycocalyx:

Glycocalyx is a combination of glycoprotein and glycolipid. It's a sugar layer on top of the membrane.

  • Cholesterol:

It is mostly found in animal cells.

Functions of plasma membrane:

  1. Movement of various materials within and outside the cell.
  2. Absorption of various substances from outside the cell.
  3. Protection of the cell body and formation of a distinct shape for the cell.


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