Split reins are a piece of equipment used for communicating with a horse while it is being ridden. Split reins are actually two separate, individual reins that are used together, with one rein on each side of the horse's neck.
As discussed above, mitochondria are the sites of respiration, and generate chemical energy in the form of ATP by metabolizing sugars, fats, and other chemical fuels with the assistance of molecular oxygen.
The main function of mitochondria in aerobic cells is the production of energy by synthesis of ATP. However, mitochondria also have many other functions, including e.g.: Processing and storage of calcium ions (Ca2+). Apoptosis, i.e. the process of programmed cell death. Regulation of cellular metabolism.