Round 2:Why do we need oxygen in our cells?
All cells in our body need oxygen to create energy. (1) Cells create energy, however, they also create carbon dioxide. We get oxygen by breathing in the fresh air, and we remove carbon dioxide from the body by breathing out air.
Our bodies process three things: food, liquid, and oxygen. And while we might enjoy the food and the liquid more, it’s the oxygen that actually provides the fuel that runs our body. Oxygen, through a process called cellular respiration (2), chemically changes food and liquid into energy. Body cells use oxygen to transfer the energy stored in food to a usable form. It’s this “oxygen fire” that makes our muscles, repairs our cells, helps our brains to function, and also helps our nerves.
Not only that, but breathing is the most important thing in our body. CO2 is produced from the reaction and this is toxic to our bodies so we have to get rid of it.
Every day, our body burns about seven billion old cells. Breathing in and out is just a physical process and not respiration. When we talk about respiration we mean chemical reaction. During respiration, energy is produced called ATP (3).