Endoplasmic reticulum
The endoplasmic reticulum consist of flattened
single membrane vesicles. These have the same lipid bilayer structure but
thinner than the cell membrane (about 7mm). The endoplasmic reticulum is of two
types; rough (RER) and smooth (SER). Only the rough type has small granules
known as ribosomes (Fig. 1.6).
RER is concerned with protein synthesis while
SER is concerned with lipids and glycoprotein synthesis. The cisternae
(enclosed spaces) of the endoplasmic reticulum play a role in the exchange of
material between the cell and the extra cellular fluid. The exchange of
material takes place by the process of pinocytosis.
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