Respiratory System

2. Main tube that air first enters into the respiratory system.
4. Process of breathing oxygen into our lungs.
8. Small tiny air filled sacs that exchange oxygen for carbon dioxide.
9. Our left lung is slightly smaller because it needs room for this.
12. These form the rings around the trachea that keeps it open instead of collapsing.

1. Tiny passageways that carry oxygen from the bronchi to the alveoli, they are as small as a strand of hair.
3. Process of breathing carbon dioxide (waste) out of our lungs.
5. Small flap that covers our trachea so that when we swallow our food goes into our esophagus and stomach instead of our lungs.
6. Attached to the trachea, has a left and right side that channels air into each lung.
7. Dome shaped muscle at the bottom of the respiratory system that helps us inhale and exhale.
10. The color of sick, unhealthy lungs usually from smoking.
11. The color of healthy lungs.