Definition of Cellular Respiration
Cellular respiration is a biological process through which the living organisms, in the presence of oxygen metabolize the food molecules such as glucose and convert them into energy i.e. ATP molecules which help them to carry out life-sustaining activities. The waste products are also discarded which are carbon dioxide and water in this process.
The organisms that are anaerobes (do not need oxygen), they metabolize their food through the process of fermentation. The ATP formed through cellular respiration is utilized in other cellular processes taking place in the living systems. Cellular respiration occurs in the mitochondria, hence it is also known to be the powerhouse of the cell.