Breathing

Breathing
When we breathe, we suck air into our body through our nose and mouth, and blow it out again. The air goes down a tube in our throat and into our lungs, which are two stretchy, spongy bags in our chest. Air contains a gas called oxygen, which we need to stay alive. As we breathe, our blood collects the oxygen and takes it to every part of your body.
Our body needs oxygen that we use to breathe to get energy. When we move fast or work hard, we use more energy. We have to breathe quickly and take a deeper breath.
When our cells take energy from food, they make a waste called carbon dioxide. Our blood takes this waste back to your lungs. We get rid of it when you when we breathe out.