Why do we need the Respiratory system?

The Respiratory System is one of the main systems in our body. The Respiratory System is used to bur bring oxygen in and around our body. This happens when the oxygen goes into the Alveoli, Which is conected to the capillary, and through the capillary and into our heart which pumps it through our blood stream. We need the respiratory system to pump oxygen through our bodies so we can stay alive. And if all this doesnt happen our brain will shut down and we will eventualy die.