Krebs, also known as the Krebs cycle or citric acid cycle, is a series of chemical reactions that occur in the cells of living organisms. It plays a crucial role in cellular respiration, where energy is produced from the breakdown of carbohydrates, fats, and proteins. This cycle takes place in the mitochondria, the powerhouse of the cell, and helps convert nutrients into energy in the form of ATP (adenosine triphosphate). The cycle was named after the biochemist Hans Krebs, who first described it in 1937. During the Krebs cycle, acetyl-CoA, derived from food, is oxidized, leading to the production of carbon dioxide and high-energy electron carriers like NADH and FADH2. These carriers are essential for the next stage of cellular respiration, where they help generate more ATP through the electron transport chain.