Can people live without air?
We live by breathing air. We take in oxygen from the air to produce energy. Oxygen is essential for us to move our bodies and to think about things. You could say oxygen is the source of all energy we need to live.
When we breathe in air through our nose and mouth, the air goes to our lungs. When it gets to our lungs, oxygen is taken into our bloodstream. Oxygen is then carried throughout our body through blood vessels. As your blood delivers oxygen, it receives unneeded carbon dioxide in return and carries the carbon dioxide to your lungs. Your lungs exhale the carbon dioxide through your nose and mouth.
Humans aren’t the only living things that live by breathing oxygen in the air. Animals, birds, and insects also need oxygen to survive. And even fish in rivers and oceans breathe oxygen in the water.
