endoplasmic reticulum (SER).
Rough Endoplasmic Reticulum
Smooth Endoplasmic Reticulum
I contains flattened sacs called cisternae.
1. It is mainly formed of vesicles and tubules.
ibosomes are attached to the outer surface of its
2. It does not contain ribosomes.
hembrane.
is specialized to synthesize proteins.
3. It is specialized to synthesize lipids and steroids.
is abundant in exocrine pancreatic cells and
4. It is abundant in liver and the testicular cells
tibodies secreting plasma cells.
(e.g. Leydig cells) synthesizing steroid hormones
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The endoplasmic reticulum is found in most eukaryotic cells and forms an interconnected network of flattened, membrane-enclosed sacs known as cisternae (in the RER), and tubular structures in the SER. The membranes of the ER are continuous with the outer nuclear membrane.
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