This process requires specialized organs such as the lungs or gills. This oxygen is used for cellular respiration and metabolism, a byproduct of which is carbon dioxide.

Respiration is the cellular process of releasing energy from food. Aerobic respiration releases fifteen times more energy than fermentation.

We can show the possible reactions of any substance in a cell in a diagram ... and is used in the process of respiration. All cells require glucose for respiration. Animals can convert glycogen ...