Organelles within a liver cell

Cytoplasm of a liver cell showing mitochondria, rough endoplasmic reticulum and smooth endoplasmic reticulum. Mitochondria are theroundish structures and are the energy factories within the cell. Rough endoplasmic reticulum is so-called because it has ribosomes attached to its outer surface. Smooth endoplasmic reticulum has no ribosomes attached and is seen towards the bottom of the image. The horizontal field width of the sample is 2.9 micrometres.