What happens during cellular respiration

in cellular respiration food is oxidized to CO2 while O2 is reduced into H2O Cellular respiration takes in food and uses it to create ATP, a chemical which the cell uses for energy. Usually, this process uses oxygen, and is called aerobic respiration. Aerobic respiration, the process that does use oxygen, produces much more energy and doesn't produce lactic acid. It also produces carbon dioxide as a waste product, which then enters the circulatory system