CYTOPLASM

the protoplasm of a cell external to the nuclear membrane. In eukaryotes (i.e., cells having a nucleus), the cytoplasm contains all of the organelles except for the nucleus itself. Among such organelles are the mitochondria, which are the sites of energy production through ATP (adenosine triphosphate) synthesis; the endoplasmic reticulum, the site of lipid and protein synthesis; the Golgi apparatus, which packages macromolecules into vesicles for transport; lysosomes and peroxisomes, sacs of digestive enzymes that carry out the intracellular digestion of macromolecules such as lipids and proteins; the cytoskeleton, a network of protein fibres that give shape and support to the cell; and cytosol, the fluid mass that surrounds the various organelles.