Breathing

Breathing isn’t something we often think about.  When you were born, your lungs were filled with amniotic fluid; they were not inflated.
You took your first breath within about 10 seconds after being born, and from that point on, your breathing became an automatic response for your respiratory system.
Your respiratory system gathers the oxygen your body needs from the air. It also gets rid of what your body doesn’t need, like CO2 and other metabolic wastes. When all of this happens, your body’s organs are able to work properly.