Energy is necessary for all living organisms in order to survive, this energy occurs through the process of cellular respiration. According to the lab book, “cellular respiration …show more content…
The presence of oxygen is used in the production of carbon dioxide and water through cellular respiration. The product in cellular respiration is ATP and waste products including carbon dioxide and water. During the reaction, energy is released and taken by ATP, the high-energy molecule in cells used as a “chemical food.” All cells in animals and plants undertake the use of cellular respiration as a process of converting stored energy into a chemical reaction that cells consume or create. The aspects of cellular respiration are divided into three parts: glycolysis, Krebs cycle, and the electron transport chain. Glycolysis is the first cycle of cellular respiration that occurs in the cytoplasm. Glycolysis is the breaking down of glucose that forms pyruvate into two molecules of ATP. Two pathways start the process of glycolysis, aerobic and anaerobic. In aerobic respiration is the use of oxygen in cells. Anaerobic respiration is when oxygen is not present. Since glucose is a 6-carbon ring and it is broken two molecules, these parts are called pyruvate and pyruvic acid. Pyruvate is the end product of glycolysis where it stands in between the junction of anaerobic and …show more content…
Pyruvic acid is the end product of glycolysis, it either supplies energy to living cells through the Krebs cycle where aerobic respiration occurs or fermentation can be used under anaerobic respiration. However, pyruvic acid is broken down into acetyl-Coenzyme A then after oxidized to release carbon dioxide. Following glycolysis comes the Krebs cycle, which is an aerobic respiration process that produces ATP. Oxygen is acquired and it occurs in the mitochondria of the cell. First pyruvate needs to be converted into Acetyl-CoA in order to enter the Krebs cycle. The Krebs cycle is a metabolic pathway that breaks down carbohydrates, fats, and proteins into carbon dioxide and water in order to produce energy. The result of the Krebs cycle involves the production of a lot of NADH, ATP, FADH2 and carbon dioxide is released that goes onto the next step of cellular respiration. The last step of cellular respiration that is also the most complex and productive pathway is electron transport chain. It is the process where NADH and FADH2 are produced during glycolysis in the mitochondria. According to the website, Khan Academy, it states, “anaerobic is not the only pathway for oxidizing fuel molecules without oxygen.” In fermentation,