the breathing process in the human body

Breathing is very important for the human body. If you can't breathe, you will die soon. First, you have to open your month to let oxygen flow into your body. the oxygen will go to your lungs. Then, when you give out breath, you have to let carbon dioxide out to your month and then you complete your steps of breathing. However, when you do some exercises or any intense activities, your condition of breathing will become fast because you have a lot of carbon dioxide in your lungs, you need to get it out quickly. I hope everyone can have a normal respiratory system and your lungs are always health without carbon dioxide. That's why breathing is very important for me.