Respiratory System

3. causes spasms or uncontrolled contractions of the smooth muscle in the bronchial tubes.
5. They fill up with air which allows the lungs to get bigger. It allows oxygen from the air to pass into your blood.
9. breathing in
10. which are small blood vessels with thin walls are wrapped around alveolies.
11. Dioxide The air that you breathe out contains this.
12. system of the body that deals with breathing.

1. muscle that controls the breathing process
2. causes mucus membranes throughout the body to produce too much mucus. The excess mucus cogs the bronchial tubes and obstructs breathing.
4. breathing out
6. lungs are covered by two really slick special layers.
7. lung tissue is destroyed and air sacs are lost.
8. tiny hairs move gently to keep mucus and dirt out of the lungs.