In cell biology, a<unk>  (plural<unk> chondria) is a membrane-enclosed organelle found in most eukaryotic cells. These organelles range from 1–10 micrometers (μm) in size.<unk> chondria are sometimes described as "cellular power plants" because they generate most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy. In addition to supplying cellular energy,<unk> chondria are involved in a range of other processes, such as signaling, cellular differentiation, cell death, as well as the control of the cell cycle and cell growth.<unk> chondria have been implicated in several human diseases and may play a role in the aging process. The word<unk>  comes from the Greek μίτος  or<unk> s, thread + χονδρίον or khondrion, granule. Their ancestry is not fully understood, but, according to the endosymbiotic theory,<unk> chondria are descended from ancient bacteria, which were engulfed by the ancestors of eukaryotic cells more than a billion years ago.
Several characteristics make<unk> chondria unique. The number of<unk> chondria in a cell varies widely by organism and tissue type. Many cells have only a single<unk> , whereas others can contain several thousand<unk> chondria. The organelle is composed of compartments that carry out specialized functions. These compartments or regions include the outer membrane, the intermembrane space, the inner membrane, and the cristae and matrix. In humans,<unk> chondria contain about 615 distinct types of proteins, depending on the tissue of origin. Although most of a cell's DNA is contained in the cell nucleus, the<unk>  has its own independent genome. Further, its DNA shows substantial similarity to bacterial genomes.
Mitochondrion
Sarcomere
Ovacome
Cytoskeleton
Nuclear envelope
Lysosome
Cytome
Ribosomal RNA