Cellular respiration is a metabolic process that occurs in both plants and animals. In this process plant and animal cells convert biochemical energy from nutrients into energy called ATP or adenine triphosphate. In the meantime cellular respiration in plants exhale oxygen as a byproduct. Cellular respiration is considered an exothermic redox reaction, there are 3 main stages in cellular respiration. It is broken down into glycolysis, the Krebs cycle and the electron transport chain. Cellular respiration is vital in order to produce energy in any organism. The plant in the image exemplifies one of the various organisms that utilizes cellular respiration for energy.