Written By: Ehsan Jahandarpour

A mitochondrion (/ˌmaɪtəˈkɒndriən/; pl. mitochondria) is a double-membrane-bound organelle found in most eukaryotic organisms. Mitochondria generate most of the cell’s supply of adenosine triphosphate (ATP), subsequently utilized as a source of chemical energy, using the energy of oxygen released in aerobic respiration at the inner mitochondrial membrane. They were first discovered by Albert von Kölliker in 1880 in the voluntary muscles of insects. The mitochondrion is popularly nicknamed the “powerhouse of the cell”, a phrase coined by Philip Siekevitz in a 1957 article of the same name.