The primary purpose of cellular respiration is to convert biochemical energy from nutrients into adenosine triphosphate (ATP), which is then used to power various cellular processes. This process plays a critical role in maintaining energy homeostasis in living organisms. Cellular respiration occurs in both aerobic and anaerobic conditions, involving a series of reactions that include glycolysis, the Krebs cycle, and the electron transport chain. The by-products of cellular respiration include carbon dioxide and water, which are essential for homeostasis.