How Many Endoplasmic Reticulum Are in a Cell

There are two types of endoplasmic reticulum: rough endoplasmic reticulum (rough ER) and smooth endoplasmic reticulum (smooth ER). Both types are present in plant and animal cells. The two types of ER often appear as if separate, but they are sub-compartments of the same organelle.

What cells have a lot of endoplasmic reticulum?

Liver cells have an impressive network of smooth endoplasmic reticulum. Similarly, cells of the ovaries and testes, which produce the lipid-containing hormones estrogen and testosterone, contain large amounts of smooth endoplasmic reticulum.

Do muscle cells have a lot of endoplasmic reticulum?

Even though it has a restricted secretory function, skeletal muscle is interesting with respect to the unfolded protein response because it contains an extremely extensive network of specialized ER called the sarcoplasmic reticulum.