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  Cell Membrane

Cell Membrane:

Introduction:

The external living boundary of the cell is known as the cell membrane or ‘Plasma membrane’. The word cell membrane was coined by C.J. Nageli and C. Crammer in the year 1855. Except the cell membrane, all organelle in the cell is also covered through membranes. The cell membrane not just only limits the cell cytosol, but it comprises a variety of functions such as membrane transport, signal transduction and transmission of neuro.

Chemical Composition:

To learning the chemical composition of the cell membrane, the favoured source is RBC (red blood cell), since they lack cell organelles and so no contamination of other cellular organelle membranes. The membranes of the RBCs (red blood cells) devoid of cytosol are called like ‘ghosts’.

Four main constituents are available in the cell membrane. They are as follow:

1) Lipids (28 – 79%)
2) Proteins (20 – 70%).
3) Oligosaccharides (only 1 – 5%) and
4) Water (20%).

 

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