Definition of mitochondria

An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers

Mitochondria is a spherical or elongated organelle in the cytoplasm of nearly all eukaryotic cells, containing genetic material and many enzymes importantfor cell metabolism, including those responsible for the conversion of food to usable energy.