From my reading I have learned that cellular respiration is a multi-step metabolic reaction process that occurs in the cell of every living organism, rather than whether it is plant or animal. As I understand it, there are two types of cellular respiration, one called aerobic cellular respiration which requires oxygen and anaerobic cellular respiration which does not require oxygen. In the process of anaerobic cellular respiration, unlike the aerobic process, oxygen is not required nor is it the ultimate electron acceptor producing fewer ATP molecules and releasing alcohol or lactic acid byproducts. The process of anaerobic cellular respiration starts exactly like anaerobic respiration, but stops halfway due to lack of oxygen. TutorVista.com (2015), states that; “Photosynthesis and cellular respiration are metabolic reactions that complement each other in the environment. They are the same reactions but they happen in reverse. In photosynthesis, carbon dioxide and water produce glucose and oxygen respiration, the process of glucose and oxygen produce carbon dioxide and water, catabolic pathway process that requires or contains molecular oxygen to produce adenosine triphosphate. This three-step cycle of aerobic respiration occurs in the cytoplasm and organelles called mitochondria. Within this process, cells break down oxygen and glucose into its storable form called adenosine triphosphate, or ATP. This cellular respiration, or sometimes called an exothermic reaction, is similar to a combustion-type reaction where the cell releases energy in the form of heat but at a much slower rate inside a living cell. According to our text, Campbell Essential Biology with Physiology, (2010, page 94), cellular respiration is defined as “The aerobic harvesting of energy from food molecules; the chemical breakdown of food molecules, such as glucose, which releases energy, and the storage of potential energy in a form that cells can use to perform work; involves glycolysis, the citric acid cycle, the electron transport chain and chemiosmosis.” I also understand that it is possible for cellular respiration to occur without oxygen, a phenomenon called anaerobic respiration. In the anaerobic respiration process the glycosis phase, sometimes called the metabolic pathway process, differs because the anaerobic condition produces