● The process of breakdown of food in the cell with the release of energy is called cellular respiration. ● In the cell, the food (glucose) is broken down into carbon dioxide and water using oxygen. ● When the breakdown of glucose occurs with the use of oxygen it is called aerobic respiration . ● When the breakdown of glucose occurs without the use of oxygen it is called anaerobic respiration . ● Breakdown of food releases energy. ● In the absence of oxygen, glucose breaks down into alcohol, carbon dioxide, and energy . ● In the presence of oxygen, glucose breaks down into the water, carbon dioxide, and energy