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endoplasmic reticulum
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Diagram of the endoplasmic reticulum in a cell, showing the nuclear envelope connected to smooth and rough endoplasmic reticulum, with ribosomes attached to the rough portion and labeled cisternae and cisternal space. Endoplasmic reticulum; organelle Color-enhanced electron micrograph showing yellow mitochondria and blue endoplasmic reticulum within magenta-stained hepatocyte liver cells at high magnification.
The video thumbnail image shows an illustration of an animal cell next to a photo of a whale swimming in the oean.
How different parts of a cell interact
Illustration comparing three cell types: a round animal cell and an irregularly shaped plant cell, both showing labeled organelles, and an elongated bacteria cell with labeled structures such as flagella and capsule. Side-by-side labeled diagrams of a typical animal cell and a plant cell, showing internal structures such as nucleus, mitochondrion, endoplasmic reticulum, and unique features like chloroplasts and cell wall in the plant cell.
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endoplasmic reticulum summary
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Videos

The Major Parts of an Animal Cell
From teeny-tiny ants to 200-ton whales, all members of the animal kingdom are composed...
Video: Encyclopædia Britannica, Inc.
How different parts of a cell interact
Learn about the different cell organelles, including the mitochondrion, the nucleus,...
Video: Encyclopædia Britannica, Inc.

Images

Endoplasmic reticulum
A continuous membrane system in eukaryotic cells, the endoplasmic reticulum plays...
Encyclopædia Britannica, Inc.
Endoplasmic reticulum; organelle
A scanning electron micrograph of a pancreatic acinar cell, showing mitochondria...
Pietro M. Motta & Tomonori Naguro/Science Source
endoplasmic reticulum; mitochondria
Electron micrograph of hepatocyte cells showing mitochondria (yellow) and endoplasmic...
© BISP—Universal Images Group/Getty Images
Bacterial, animal, and plant cells compared
Bacterial cells differ from animal cells and plant cells in several ways. One fundamental...
Encyclopædia Britannica, Inc.
Organelles of eukaryotic cells
A defining feature of eukaryotic cells is the presence of membrane-bound organelles...
Encyclopædia Britannica, Inc.