Many Mitochondria’s are found in most eukaryotic cells, they are sausage- shaped organelles, they average around 10µm in length. Each mitochondrion has a outer and inner membrane, the inner membrane is folded to form structures called cristae.

Mitochondria are often referred to as the ‘powerhouse’ of the cell this is because it’s main purpose is to provide energy, this explains why cells such as muscles cells which require a lot of energy have abundant mitochondria.