Mitochondria

I am the site of the most reactions of cellular respiration. Through aerobic respiration, I am able to take oxygen and convert the chemical energy present in certain foods into ATP. During this aerobic respiration process, i take carbon and oxygen atoms from food molecules like glucose and convert them into CO2 and Water. I have been counted over 1000 times in a single liver cell so there are plenty of me's out there in the world. My counter part, chloroplasts, do exactly the same thing I do, just from a different fuel source. While I take oxygen and chemical energy, chloroplasts absorb light radiation from the sun, absorb CO2 and Water through the air and ground, respectively, and turn it into ATP. A bi-product of that process (known as photosynthesis) is O2 and glucose, which I, the mighty mitochondria, take in and the whole cycle is restarted.