Why do we need Oxygen?

Oxygen serves a variety of functions in the human body. One has to do with the conversion of energy from the food we eat. Cellular respiration is the name for this process. The mitochondria in your body's cells use oxygen to help break down glucose (sugar) into an useable fuel source during this process. This gives you the vitality you require to live. While your brain only accounts for 2% of your entire body weight, it consumes 20% of the oxygen your body consumes. Why? It necessitates a great ...