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.
Mitochondria (singular, mitochondrion) are organelles that carry out cellular respiration in nearly all eukaryotic cells, converting the chemical energy of foods such as sugar â¦ s to the chemical energy of a molecule called ATP (adenosine triphosphate).