THE BREATHING SYSTEM
- Air breathed in goes through the trachea
- The trachea splits into two tubes called the bronchi, one goes to each lung. One is called a bronchus
- The bronchi get progressively smaller, and split into tubes called bronchioles
- The bronchioles end at the alveoli, which are tiny bags of air. This is where the gas exchange takes place.
The job of the alveoli is to transfer…