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*'''Smooth endoplasmic reticulum''' ('''SER'''). Among its functions is the production of proteins and [[steroids]], the maintenance of [[Membrane#Plasma Membranes|plasma membranes]], and a pathway for molecules to move along.
*'''Smooth endoplasmic reticulum''' ('''SER'''). Among its functions is the production of proteins and [[steroids]], the maintenance of [[Membrane#Plasma Membranes|plasma membranes]], and a pathway for molecules to move along.
Similar to the ER is the '''sarcoplasmic reticulum''' ('''SR''') found only in [[muscle]] cells. The SR stores and pumps [[calcium]] [[ion]]s. The SR contains large stores of calcium, which it releases when the muscle cell is stimulated.<ref name="sarcoplasmic">{{cite journal|author=Toyoshima C. |display-authors = etal|title=Crystal structure of the calcium pump of sarcoplasmic reticulum at 2.6 A resolution|journal=Nature|volume=405|issue=6787|pages=647–55|year=2000|pmid=10864315|doi=10.1038/35015017|s2cid = 4316039}}</ref> Another type of cytoplasmic network is the plate-like [[Golgi apparatus]].
Similar to the ER is the '''sarcoplasmic reticulum''' ('''SR''') found only in [[muscle]] cells. The SR stores and pumps [[calcium]] [[ion]]s. The SR contains large stores of calcium, which it releases when the muscle cell is stimulated.<ref name="sarcoplasmic">{{cite journal|author=Toyoshima C. |display-authors = etal|title=Crystal structure of the calcium pump of sarcoplasmic reticulum at 2.6 A resolution|url=https://archive.org/details/sim_nature-uk_2000-06-08_405_6787/page/646 |journal=Nature|volume=405|issue=6787|pages=647–55|year=2000|pmid=10864315|doi=10.1038/35015017|s2cid = 4316039}}</ref> Another type of cytoplasmic network is the plate-like [[Golgi apparatus]].
The lacey membranes of the endoplasmic reticulum were first seen in 1945 by scientists using an [[electron microscope]].<ref name="FirstER">{{cite journal| author=Porter K.R; Claude A. & Fullam E.F.| year=1945| title=A study of tissue culture cells by electron microscopy| journal=J Exp Med.| volume=81| pages=233–246| doi=10.1084/jem.81.3.233| pmid=19871454| issue=3| pmc=2135493}}</ref>
The lacey membranes of the endoplasmic reticulum were first seen in 1945 by scientists using an [[electron microscope]].<ref name="FirstER">{{cite journal| author=Porter K.R; Claude A. & Fullam E.F.| year=1945| title=A study of tissue culture cells by electron microscopy| journal=J Exp Med.| volume=81| pages=233–246| doi=10.1084/jem.81.3.233| pmid=19871454| issue=3| pmc=2135493}}</ref>