Respiratory System

4. When the muscles relax, air moves out
5. a part of the thorax where the lungs are sealed (2 words)
6. the natural passageway for air to enter the lungs and leave the lungs
10. caused by sudden contractions of the diaphragm
11. the tube that leads to the stomach
13. each tube has a fine layer of this to trap dust particles and bacteria and helps push it out
14. provide a very large surface area, allowing gas to be easily exchanged between the lungs and the bloodstream

1. makes sure only air enters the trachea
2. The total volume of air that can be exhaled after maximal inhalation (2 words)
3. As the diaphragm moves down, the air is pulled into the lungs
7. thin sheet of muscle at the base of the pleural cavity
8. when bacteria starts growing in the lungs
9. Main organs of the respiratory system that have no muscle tissue
12. the narrowing of the bronchiole tubes